Merge branch 'i2c/for-5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:
 "I2C has only driver updates for you this time.

  Mostly new IDs/DT compatibles, also SPDX conversions, small cleanups.
  STM32F7 got FastMode+ and PM support, Axxia some reliabilty
  improvements"

* 'i2c/for-5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (26 commits)
  i2c: Add Actions Semiconductor Owl family S700 I2C support
  dt-bindings: i2c: Add S700 support for Actions Semi Soc's
  i2c: ismt: Add support for Intel Cedar Fork
  i2c: tegra: Switch to SPDX identifier
  i2c: tegra: Add missing kerneldoc for some fields
  i2c: tegra: Cleanup kerneldoc comments
  i2c: axxia: support sequence command mode
  dt-bindings: i2c: rcar: Add r8a774c0 support
  dt-bindings: i2c: sh_mobile: Add r8a774c0 support
  i2c: sh_mobile: Add support for r8a774c0 (RZ/G2E)
  i2c: i2c-cros-ec-tunnel: Switch to SPDX identifier.
  i2c: powermac: Use of_node_name_eq for node name comparisons
  i2c-axxia: check for error conditions first
  i2c-axxia: dedicated function to set client addr
  dt-bindings: i2c: Use correct vendor prefix for Atmel
  i2c: tegra: replace spin_lock_irqsave with spin_lock in ISR
  eeprom: at24: add support for 24c2048
  dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string
  i2c: i2c-stm32f7: add PM Runtime support
  i2c: sh_mobile: add support for r8a77990 (R-Car E3)
  ...

Documentation/devicetree/bindings/eeprom/at24.txt

@@ -27,6 +27,7 @@ Required properties:
                 "atmel,24c256",
                 "atmel,24c512",
                 "atmel,24c1024",
+                "atmel,24c2048",
 
                 If <manufacturer> is not "atmel", then a fallback must be used
                 with the same <model> and "atmel" as manufacturer.

Documentation/devicetree/bindings/i2c/i2c-at91.txt

@@ -33,7 +33,7 @@ i2c0: i2c@fff84000 {
 	clock-frequency = <400000>;
 
 	24c512@50 {
-		compatible = "24c512";
+		compatible = "atmel,24c512";
 		reg = <0x50>;
 		pagesize = <128>;
 	}

Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt

@@ -43,7 +43,7 @@ Example:
 			reg = <0>;
 
 			eeprom@50 {
-				compatible = "at,24c02";
+				compatible = "atmel,24c02";
 				reg = <0x50>;
 			};
 		};
@@ -54,7 +54,7 @@ Example:
 			reg = <1>;
 
 			eeprom@50 {
-				compatible = "at,24c02";
+				compatible = "atmel,24c02";
 				reg = <0x50>;
 			};
 		};

Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt

@@ -54,7 +54,7 @@ Example:
 			reg = <2>;
 
 			eeprom@54 {
-				compatible = "at,24c08";
+				compatible = "atmel,24c08";
 				reg = <0x54>;
 			};
 		};

Documentation/devicetree/bindings/i2c/i2c-owl.txt

@@ -2,7 +2,9 @@ Actions Semiconductor Owl I2C controller
 
 Required properties:
 
-- compatible        : Should be "actions,s900-i2c".
+- compatible        : Should be one of the following:
+		      - "actions,s700-i2c" for S700 SoC
+		      - "actions,s900-i2c" for S900 SoC
 - reg               : Offset and length of the register set for the device.
 - #address-cells    : Should be 1.
 - #size-cells       : Should be 0.

Documentation/devicetree/bindings/i2c/i2c-rcar.txt

@@ -7,6 +7,7 @@ Required properties:
 	"renesas,i2c-r8a7745" if the device is a part of a R8A7745 SoC.
 	"renesas,i2c-r8a77470" if the device is a part of a R8A77470 SoC.
 	"renesas,i2c-r8a774a1" if the device is a part of a R8A774A1 SoC.
+	"renesas,i2c-r8a774c0" if the device is a part of a R8A774C0 SoC.
 	"renesas,i2c-r8a7778" if the device is a part of a R8A7778 SoC.
 	"renesas,i2c-r8a7779" if the device is a part of a R8A7779 SoC.
 	"renesas,i2c-r8a7790" if the device is a part of a R8A7790 SoC.

Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt

@@ -8,6 +8,7 @@ Required properties:
 			- "renesas,iic-r8a7744" (RZ/G1N)
 			- "renesas,iic-r8a7745" (RZ/G1E)
 			- "renesas,iic-r8a774a1" (RZ/G2M)
+			- "renesas,iic-r8a774c0" (RZ/G2E)
 			- "renesas,iic-r8a7790" (R-Car H2)
 			- "renesas,iic-r8a7791" (R-Car M2-W)
 			- "renesas,iic-r8a7792" (R-Car V2H)
@@ -16,6 +17,7 @@ Required properties:
 			- "renesas,iic-r8a7795" (R-Car H3)
 			- "renesas,iic-r8a7796" (R-Car M3-W)
 			- "renesas,iic-r8a77965" (R-Car M3-N)
+			- "renesas,iic-r8a77990" (R-Car E3)
 			- "renesas,iic-sh73a0" (SH-Mobile AG5)
 			- "renesas,rcar-gen2-iic" (generic R-Car Gen2 or RZ/G1
 							compatible device)
@@ -28,7 +30,13 @@ Required properties:
 			the platform first followed by the generic R-Car
 			version.
 
-			renesas,rmobile-iic must always follow.
+			When compatible with "renesas,rmobile-iic" it should
+			be the last compatibility string listed.
+
+			The r8a77990 (R-Car E3) and r8a774c0 (RZ/G2E)
+			controllers are not considered compatible with
+			"renesas,rcar-gen3-iic" or "renesas,rmobile-iic"
+			due to the absence of automatic transmission registers.
 
 - reg             : address start and address range size of device
 - interrupts      : interrupt of device

Documentation/devicetree/bindings/i2c/i2c-stm32.txt

@@ -26,6 +26,11 @@ Optional properties :
 - i2c-scl-falling-time-ns : Only for STM32F7, I2C SCL Falling time for the board
   (default: 10)
   I2C Timings are derived from these 2 values
+- st,syscfg-fmp:  Only for STM32F7, use to set Fast Mode Plus bit within SYSCFG
+  whether Fast Mode Plus speed is selected by slave.
+	1st cell : phandle to syscfg
+	2nd cell : register offset within SYSCFG
+	3rd cell : register bitmask for FMP bit
 
 Example :
 
@@ -53,4 +58,5 @@ Example :
 		clocks = <&rcc 1 CLK_I2C1>;
 		pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;
 		pinctrl-names = "default";
+		st,syscfg-fmp = <&syscfg 0x4 0x1>;
 	};

Documentation/devicetree/bindings/i2c/nxp,pca9541.txt

@@ -22,7 +22,7 @@ Example:
 			#size-cells = <0>;
 
 			eeprom@54 {
-				compatible = "at,24c08";
+				compatible = "atmel,24c08";
 				reg = <0x54>;
 			};
 		};

drivers/i2c/busses/i2c-axxia.c

@@ -12,6 +12,7 @@
  */
 #include <linux/clk.h>
 #include <linux/clkdev.h>
+#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
@@ -25,6 +26,7 @@
 #define I2C_XFER_TIMEOUT    (msecs_to_jiffies(250))
 #define I2C_STOP_TIMEOUT    (msecs_to_jiffies(100))
 #define FIFO_SIZE           8
+#define SEQ_LEN             2
 
 #define GLOBAL_CONTROL		0x00
 #define   GLOBAL_MST_EN         BIT(0)
@@ -51,6 +53,7 @@
 #define   CMD_BUSY		(1<<3)
 #define   CMD_MANUAL		(0x00 | CMD_BUSY)
 #define   CMD_AUTO		(0x01 | CMD_BUSY)
+#define   CMD_SEQUENCE		(0x02 | CMD_BUSY)
 #define MST_RX_XFER		0x2c
 #define MST_TX_XFER		0x30
 #define MST_ADDR_1		0x34
@@ -87,7 +90,9 @@
  * axxia_i2c_dev - I2C device context
  * @base: pointer to register struct
  * @msg: pointer to current message
- * @msg_xfrd: number of bytes transferred in msg
+ * @msg_r: pointer to current read message (sequence transfer)
+ * @msg_xfrd: number of bytes transferred in tx_fifo
+ * @msg_xfrd_r: number of bytes transferred in rx_fifo
  * @msg_err: error code for completed message
  * @msg_complete: xfer completion object
  * @dev: device reference
@@ -98,7 +103,9 @@
 struct axxia_i2c_dev {
 	void __iomem *base;
 	struct i2c_msg *msg;
+	struct i2c_msg *msg_r;
 	size_t msg_xfrd;
+	size_t msg_xfrd_r;
 	int msg_err;
 	struct completion msg_complete;
 	struct device *dev;
@@ -227,14 +234,14 @@ static int i2c_m_recv_len(const struct i2c_msg *msg)
  */
 static int axxia_i2c_empty_rx_fifo(struct axxia_i2c_dev *idev)
 {
-	struct i2c_msg *msg = idev->msg;
+	struct i2c_msg *msg = idev->msg_r;
 	size_t rx_fifo_avail = readl(idev->base + MST_RX_FIFO);
-	int bytes_to_transfer = min(rx_fifo_avail, msg->len - idev->msg_xfrd);
+	int bytes_to_transfer = min(rx_fifo_avail, msg->len - idev->msg_xfrd_r);
 
 	while (bytes_to_transfer-- > 0) {
 		int c = readl(idev->base + MST_DATA);
 
-		if (idev->msg_xfrd == 0 && i2c_m_recv_len(msg)) {
+		if (idev->msg_xfrd_r == 0 && i2c_m_recv_len(msg)) {
 			/*
 			 * Check length byte for SMBus block read
 			 */
@@ -247,7 +254,7 @@ static int axxia_i2c_empty_rx_fifo(struct axxia_i2c_dev *idev)
 			msg->len = 1 + c;
 			writel(msg->len, idev->base + MST_RX_XFER);
 		}
-		msg->buf[idev->msg_xfrd++] = c;
+		msg->buf[idev->msg_xfrd_r++] = c;
 	}
 
 	return 0;
@@ -287,7 +294,7 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
 	}
 
 	/* RX FIFO needs service? */
-	if (i2c_m_rd(idev->msg) && (status & MST_STATUS_RFL))
+	if (i2c_m_rd(idev->msg_r) && (status & MST_STATUS_RFL))
 		axxia_i2c_empty_rx_fifo(idev);
 
 	/* TX FIFO needs service? */
@@ -296,22 +303,7 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
 			i2c_int_disable(idev, MST_STATUS_TFL);
 	}
 
-	if (status & MST_STATUS_SCC) {
-		/* Stop completed */
-		i2c_int_disable(idev, ~MST_STATUS_TSS);
-		complete(&idev->msg_complete);
-	} else if (status & MST_STATUS_SNS) {
-		/* Transfer done */
-		i2c_int_disable(idev, ~MST_STATUS_TSS);
-		if (i2c_m_rd(idev->msg) && idev->msg_xfrd < idev->msg->len)
-			axxia_i2c_empty_rx_fifo(idev);
-		complete(&idev->msg_complete);
-	} else if (status & MST_STATUS_TSS) {
-		/* Transfer timeout */
-		idev->msg_err = -ETIMEDOUT;
-		i2c_int_disable(idev, ~MST_STATUS_TSS);
-		complete(&idev->msg_complete);
-	} else if (unlikely(status & MST_STATUS_ERR)) {
+	if (unlikely(status & MST_STATUS_ERR)) {
 		/* Transfer error */
 		i2c_int_disable(idev, ~0);
 		if (status & MST_STATUS_AL)
@@ -328,6 +320,24 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
 			readl(idev->base + MST_TX_BYTES_XFRD),
 			readl(idev->base + MST_TX_XFER));
 		complete(&idev->msg_complete);
+	} else if (status & MST_STATUS_SCC) {
+		/* Stop completed */
+		i2c_int_disable(idev, ~MST_STATUS_TSS);
+		complete(&idev->msg_complete);
+	} else if (status & MST_STATUS_SNS) {
+		/* Transfer done */
+		i2c_int_disable(idev, ~MST_STATUS_TSS);
+		if (i2c_m_rd(idev->msg_r) && idev->msg_xfrd_r < idev->msg_r->len)
+			axxia_i2c_empty_rx_fifo(idev);
+		complete(&idev->msg_complete);
+	} else if (status & MST_STATUS_SS) {
+		/* Auto/Sequence transfer done */
+		complete(&idev->msg_complete);
+	} else if (status & MST_STATUS_TSS) {
+		/* Transfer timeout */
+		idev->msg_err = -ETIMEDOUT;
+		i2c_int_disable(idev, ~MST_STATUS_TSS);
+		complete(&idev->msg_complete);
 	}
 
 out:
@@ -337,17 +347,9 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
 	return IRQ_HANDLED;
 }
 
-static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
+static void axxia_i2c_set_addr(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
 {
-	u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS;
-	u32 rx_xfer, tx_xfer;
 	u32 addr_1, addr_2;
-	unsigned long time_left;
-	unsigned int wt_value;
-
-	idev->msg = msg;
-	idev->msg_xfrd = 0;
-	reinit_completion(&idev->msg_complete);
 
 	if (i2c_m_ten(msg)) {
 		/* 10-bit address
@@ -367,6 +369,90 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
 		addr_2 = 0;
 	}
 
+	writel(addr_1, idev->base + MST_ADDR_1);
+	writel(addr_2, idev->base + MST_ADDR_2);
+}
+
+/* The NAK interrupt will be sent _before_ issuing STOP command
+ * so the controller might still be busy processing it. No
+ * interrupt will be sent at the end so we have to poll for it
+ */
+static int axxia_i2c_handle_seq_nak(struct axxia_i2c_dev *idev)
+{
+	unsigned long timeout = jiffies + I2C_XFER_TIMEOUT;
+
+	do {
+		if ((readl(idev->base + MST_COMMAND) & CMD_BUSY) == 0)
+			return 0;
+		usleep_range(1, 100);
+	} while (time_before(jiffies, timeout));
+
+	return -ETIMEDOUT;
+}
+
+static int axxia_i2c_xfer_seq(struct axxia_i2c_dev *idev, struct i2c_msg msgs[])
+{
+	u32 int_mask = MST_STATUS_ERR | MST_STATUS_SS | MST_STATUS_RFL;
+	u32 rlen = i2c_m_recv_len(&msgs[1]) ? I2C_SMBUS_BLOCK_MAX : msgs[1].len;
+	unsigned long time_left;
+
+	axxia_i2c_set_addr(idev, &msgs[0]);
+
+	writel(msgs[0].len, idev->base + MST_TX_XFER);
+	writel(rlen, idev->base + MST_RX_XFER);
+
+	idev->msg = &msgs[0];
+	idev->msg_r = &msgs[1];
+	idev->msg_xfrd = 0;
+	idev->msg_xfrd_r = 0;
+	axxia_i2c_fill_tx_fifo(idev);
+
+	writel(CMD_SEQUENCE, idev->base + MST_COMMAND);
+
+	reinit_completion(&idev->msg_complete);
+	i2c_int_enable(idev, int_mask);
+
+	time_left = wait_for_completion_timeout(&idev->msg_complete,
+						I2C_XFER_TIMEOUT);
+
+	i2c_int_disable(idev, int_mask);
+
+	axxia_i2c_empty_rx_fifo(idev);
+
+	if (idev->msg_err == -ENXIO) {
+		if (axxia_i2c_handle_seq_nak(idev))
+			axxia_i2c_init(idev);
+	} else if (readl(idev->base + MST_COMMAND) & CMD_BUSY) {
+		dev_warn(idev->dev, "busy after xfer\n");
+	}
+
+	if (time_left == 0) {
+		idev->msg_err = -ETIMEDOUT;
+		i2c_recover_bus(&idev->adapter);
+		axxia_i2c_init(idev);
+	}
+
+	if (unlikely(idev->msg_err) && idev->msg_err != -ENXIO)
+		axxia_i2c_init(idev);
+
+	return idev->msg_err;
+}
+
+static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
+{
+	u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS;
+	u32 rx_xfer, tx_xfer;
+	unsigned long time_left;
+	unsigned int wt_value;
+
+	idev->msg = msg;
+	idev->msg_r = msg;
+	idev->msg_xfrd = 0;
+	idev->msg_xfrd_r = 0;
+	reinit_completion(&idev->msg_complete);
+
+	axxia_i2c_set_addr(idev, msg);
+
 	if (i2c_m_rd(msg)) {
 		/* I2C read transfer */
 		rx_xfer = i2c_m_recv_len(msg) ? I2C_SMBUS_BLOCK_MAX : msg->len;
@@ -379,8 +465,6 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
 
 	writel(rx_xfer, idev->base + MST_RX_XFER);
 	writel(tx_xfer, idev->base + MST_TX_XFER);
-	writel(addr_1, idev->base + MST_ADDR_1);
-	writel(addr_2, idev->base + MST_ADDR_2);
 
 	if (i2c_m_rd(msg))
 		int_mask |= MST_STATUS_RFL;
@@ -445,6 +529,18 @@ static int axxia_i2c_stop(struct axxia_i2c_dev *idev)
 	return 0;
 }
 
+/* This function checks if the msgs[] array contains messages compatible with
+ * Sequence mode of operation. This mode assumes there will be exactly one
+ * write of non-zero length followed by exactly one read of non-zero length,
+ * both targeted at the same client device.
+ */
+static bool axxia_i2c_sequence_ok(struct i2c_msg msgs[], int num)
+{
+	return num == SEQ_LEN && !i2c_m_rd(&msgs[0]) && i2c_m_rd(&msgs[1]) &&
+	       msgs[0].len > 0 && msgs[0].len <= FIFO_SIZE &&
+	       msgs[1].len > 0 && msgs[0].addr == msgs[1].addr;
+}
+
 static int
 axxia_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 {
@@ -453,6 +549,12 @@ axxia_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	int ret = 0;
 
 	idev->msg_err = 0;
+
+	if (axxia_i2c_sequence_ok(msgs, num)) {
+		ret = axxia_i2c_xfer_seq(idev, msgs);
+		return ret ? : SEQ_LEN;
+	}
+
 	i2c_int_enable(idev, MST_STATUS_TSS);
 
 	for (i = 0; ret == 0 && i < num; ++i)

drivers/i2c/busses/i2c-bcm2835.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * BCM2835 master mode driver
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/clk.h>

drivers/i2c/busses/i2c-cros-ec-tunnel.c

-/*
- *  Copyright (C) 2013 Google, Inc
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- * Expose an I2C passthrough to the ChromeOS EC.
- */
+// SPDX-License-Identifier: GPL-2.0+
+// Expose an I2C passthrough to the ChromeOS EC.
+//
+// Copyright (C) 2013 Google, Inc.
 
 #include <linux/module.h>
 #include <linux/i2c.h>

drivers/i2c/busses/i2c-ibm_iic.c

@@ -437,7 +437,7 @@ static int iic_wait_for_tc(struct ibm_iic_private* dev){
 				break;
 			}
 
-			if (unlikely(signal_pending(current))){
+			if (signal_pending(current)){
 				DBG("%d: poll interrupted\n", dev->idx);
 				ret = -ERESTARTSYS;
 				break;

drivers/i2c/busses/i2c-imx.c

@@ -1090,7 +1090,8 @@ static int i2c_imx_probe(struct platform_device *pdev)
 	/* Get I2C clock */
 	i2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(i2c_imx->clk)) {
-		dev_err(&pdev->dev, "can't get I2C clock\n");
+		if (PTR_ERR(i2c_imx->clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "can't get I2C clock\n");
 		return PTR_ERR(i2c_imx->clk);
 	}
 

drivers/i2c/busses/i2c-ismt.c

@@ -75,6 +75,7 @@
 /* PCI DIDs for the Intel SMBus Message Transport (SMT) Devices */
 #define PCI_DEVICE_ID_INTEL_S1200_SMT0	0x0c59
 #define PCI_DEVICE_ID_INTEL_S1200_SMT1	0x0c5a
+#define PCI_DEVICE_ID_INTEL_CDF_SMT	0x18ac
 #define PCI_DEVICE_ID_INTEL_DNV_SMT	0x19ac
 #define PCI_DEVICE_ID_INTEL_AVOTON_SMT	0x1f15
 
@@ -181,6 +182,7 @@ struct ismt_priv {
 static const struct pci_device_id ismt_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT0) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT1) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CDF_SMT) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMT) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMT) },
 	{ 0, }

drivers/i2c/busses/i2c-owl.c

@@ -475,6 +475,7 @@ static int owl_i2c_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id owl_i2c_of_match[] = {
+	{ .compatible = "actions,s700-i2c" },
 	{ .compatible = "actions,s900-i2c" },
 	{ /* sentinel */ }
 };

drivers/i2c/busses/i2c-powermac.c

@@ -229,9 +229,9 @@ static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
 		return (be32_to_cpup(prop) & 0xff) >> 1;
 
 	/* Now handle some devices with missing "reg" properties */
-	if (!strcmp(node->name, "cereal"))
+	if (of_node_name_eq(node, "cereal"))
 		return 0x60;
-	else if (!strcmp(node->name, "deq"))
+	else if (of_node_name_eq(node, "deq"))
 		return 0x34;
 
 	dev_warn(&adap->dev, "No i2c address for %pOF\n", node);
@@ -304,7 +304,7 @@ static bool i2c_powermac_get_type(struct i2c_adapter *adap,
 	}
 
 	/* Now look for known workarounds */
-	if (!strcmp(node->name, "deq")) {
+	if (of_node_name_eq(node, "deq")) {
 		/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
 		if (addr == 0x34) {
 			snprintf(type, type_size, "MAC,tas3001");
@@ -331,7 +331,7 @@ static void i2c_powermac_register_devices(struct i2c_adapter *adap,
 	 * case we skip this function completely as the device-tree will
 	 * not contain anything useful.
 	 */
-	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
+	if (of_node_name_eq(adap->dev.of_node, "via-pmu"))
 		return;
 
 	for_each_child_of_node(adap->dev.of_node, node) {

drivers/i2c/busses/i2c-sh_mobile.c

@@ -800,6 +800,7 @@ static const struct sh_mobile_dt_config r8a7740_dt_config = {
 static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
 	{ .compatible = "renesas,iic-r8a73a4", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-r8a7740", .data = &r8a7740_dt_config },
+	{ .compatible = "renesas,iic-r8a774c0", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-r8a7790", .data = &v2_freq_calc_dt_config },
 	{ .compatible = "renesas,iic-r8a7791", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-r8a7792", .data = &fast_clock_dt_config },
@@ -808,6 +809,7 @@ static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
 	{ .compatible = "renesas,rcar-gen2-iic", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-r8a7795", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,rcar-gen3-iic", .data = &fast_clock_dt_config },
+	{ .compatible = "renesas,iic-r8a77990", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-sh73a0", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,rmobile-iic", .data = &default_dt_config },
 	{},

drivers/i2c/busses/i2c-stm32f7.c

@@ -21,12 +21,16 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
 
@@ -163,6 +167,8 @@
 #define STM32F7_SCLH_MAX			BIT(8)
 #define STM32F7_SCLL_MAX			BIT(8)
 
+#define STM32F7_AUTOSUSPEND_DELAY		(HZ / 100)
+
 /**
  * struct stm32f7_i2c_spec - private i2c specification timing
  * @rate: I2C bus speed (Hz)
@@ -276,6 +282,7 @@ struct stm32f7_i2c_msg {
  * slave)
  * @dma: dma data
  * @use_dma: boolean to know if dma is used in the current transfer
+ * @regmap: holds SYSCFG phandle for Fast Mode Plus bits
  */
 struct stm32f7_i2c_dev {
 	struct i2c_adapter adap;
@@ -296,6 +303,7 @@ struct stm32f7_i2c_dev {
 	bool master_mode;
 	struct stm32_i2c_dma *dma;
 	bool use_dma;
+	struct regmap *regmap;
 };
 
 /**
@@ -1545,15 +1553,13 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
 	i2c_dev->msg_id = 0;
 	f7_msg->smbus = false;
 
-	ret = clk_enable(i2c_dev->clk);
-	if (ret) {
-		dev_err(i2c_dev->dev, "Failed to enable clock\n");
+	ret = pm_runtime_get_sync(i2c_dev->dev);
+	if (ret < 0)
 		return ret;
-	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
-		goto clk_free;
+		goto pm_free;
 
 	stm32f7_i2c_xfer_msg(i2c_dev, msgs);
 
@@ -1569,8 +1575,9 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
 		ret = -ETIMEDOUT;
 	}
 
-clk_free:
-	clk_disable(i2c_dev->clk);
+pm_free:
+	pm_runtime_mark_last_busy(i2c_dev->dev);
+	pm_runtime_put_autosuspend(i2c_dev->dev);
 
 	return (ret < 0) ? ret : num;
 }
@@ -1592,39 +1599,37 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 	f7_msg->read_write = read_write;
 	f7_msg->smbus = true;
 
-	ret = clk_enable(i2c_dev->clk);
-	if (ret) {
-		dev_err(i2c_dev->dev, "Failed to enable clock\n");
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
 		return ret;
-	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
-		goto clk_free;
+		goto pm_free;
 
 	ret = stm32f7_i2c_smbus_xfer_msg(i2c_dev, flags, command, data);
 	if (ret)
-		goto clk_free;
+		goto pm_free;
 
 	timeout = wait_for_completion_timeout(&i2c_dev->complete,
 					      i2c_dev->adap.timeout);
 	ret = f7_msg->result;
 	if (ret)
-		goto clk_free;
+		goto pm_free;
 
 	if (!timeout) {
 		dev_dbg(dev, "Access to slave 0x%x timed out\n", f7_msg->addr);
 		if (i2c_dev->use_dma)
 			dmaengine_terminate_all(dma->chan_using);
 		ret = -ETIMEDOUT;
-		goto clk_free;
+		goto pm_free;
 	}
 
 	/* Check PEC */
 	if ((flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK && read_write) {
 		ret = stm32f7_i2c_smbus_check_pec(i2c_dev);
 		if (ret)
-			goto clk_free;
+			goto pm_free;
 	}
 
 	if (read_write && size != I2C_SMBUS_QUICK) {
@@ -1649,8 +1654,9 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 		}
 	}
 
-clk_free:
-	clk_disable(i2c_dev->clk);
+pm_free:
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 	return ret;
 }
 
@@ -1676,13 +1682,9 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 	if (ret)
 		return ret;
 
-	if (!(stm32f7_i2c_is_slave_registered(i2c_dev))) {
-		ret = clk_enable(i2c_dev->clk);
-		if (ret) {
-			dev_err(dev, "Failed to enable clock\n");
-			return ret;
-		}
-	}
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
+		return ret;
 
 	if (id == 0) {
 		/* Configure Own Address 1 */
@@ -1703,7 +1705,7 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 		oar2 &= ~STM32F7_I2C_OAR2_MASK;
 		if (slave->flags & I2C_CLIENT_TEN) {
 			ret = -EOPNOTSUPP;
-			goto exit;
+			goto pm_free;
 		}
 
 		oar2 |= STM32F7_I2C_OAR2_OA2_7(slave->addr);
@@ -1712,7 +1714,7 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 		writel_relaxed(oar2, i2c_dev->base + STM32F7_I2C_OAR2);
 	} else {
 		ret = -ENODEV;
-		goto exit;
+		goto pm_free;
 	}
 
 	/* Enable ACK */
@@ -1723,11 +1725,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 		STM32F7_I2C_CR1_PE;
 	stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
 
-	return 0;
-
-exit:
-	if (!(stm32f7_i2c_is_slave_registered(i2c_dev)))
-		clk_disable(i2c_dev->clk);
+	ret = 0;
+pm_free:
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 
 	return ret;
 }
@@ -1745,6 +1746,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
 
 	WARN_ON(!i2c_dev->slave[id]);
 
+	ret = pm_runtime_get_sync(i2c_dev->dev);
+	if (ret < 0)
+		return ret;
+
 	if (id == 0) {
 		mask = STM32F7_I2C_OAR1_OA1EN;
 		stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR1, mask);
@@ -1755,14 +1760,39 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
 
 	i2c_dev->slave[id] = NULL;
 
-	if (!(stm32f7_i2c_is_slave_registered(i2c_dev))) {
+	if (!(stm32f7_i2c_is_slave_registered(i2c_dev)))
 		stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_ALL_IRQ_MASK);
-		clk_disable(i2c_dev->clk);
-	}
+
+	pm_runtime_mark_last_busy(i2c_dev->dev);
+	pm_runtime_put_autosuspend(i2c_dev->dev);
 
 	return 0;
 }
 
+static int stm32f7_i2c_setup_fm_plus_bits(struct platform_device *pdev,
+					  struct stm32f7_i2c_dev *i2c_dev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+	u32 reg, mask;
+
+	i2c_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg-fmp");
+	if (IS_ERR(i2c_dev->regmap)) {
+		/* Optional */
+		return 0;
+	}
+
+	ret = of_property_read_u32_index(np, "st,syscfg-fmp", 1, &reg);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32_index(np, "st,syscfg-fmp", 2, &mask);
+	if (ret)
+		return ret;
+
+	return regmap_update_bits(i2c_dev->regmap, reg, mask, mask);
+}
+
 static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
 {
 	return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SLAVE |
@@ -1819,6 +1849,7 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Error: Missing controller clock\n");
 		return PTR_ERR(i2c_dev->clk);
 	}
+
 	ret = clk_prepare_enable(i2c_dev->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to prepare_enable clock\n");
@@ -1828,12 +1859,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 	i2c_dev->speed = STM32_I2C_SPEED_STANDARD;
 	ret = device_property_read_u32(&pdev->dev, "clock-frequency",
 				       &clk_rate);
-	if (!ret && clk_rate >= 1000000)
+	if (!ret && clk_rate >= 1000000) {
 		i2c_dev->speed = STM32_I2C_SPEED_FAST_PLUS;
-	else if (!ret && clk_rate >= 400000)
+		ret = stm32f7_i2c_setup_fm_plus_bits(pdev, i2c_dev);
+		if (ret)
+			goto clk_free;
+	} else if (!ret && clk_rate >= 400000) {
 		i2c_dev->speed = STM32_I2C_SPEED_FAST;
-	else if (!ret && clk_rate >= 100000)
+	} else if (!ret && clk_rate >= 100000) {
 		i2c_dev->speed = STM32_I2C_SPEED_STANDARD;
+	}
 
 	rst = devm_reset_control_get(&pdev->dev, NULL);
 	if (IS_ERR(rst)) {
@@ -1888,8 +1923,6 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_free;
 
-	stm32f7_i2c_hw_config(i2c_dev);
-
 	adap = &i2c_dev->adap;
 	i2c_set_adapdata(adap, i2c_dev);
 	snprintf(adap->name, sizeof(adap->name), "STM32F7 I2C(%pa)",
@@ -1908,18 +1941,35 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 					     STM32F7_I2C_TXDR,
 					     STM32F7_I2C_RXDR);
 
-	ret = i2c_add_adapter(adap);
-	if (ret)
-		goto clk_free;
-
 	platform_set_drvdata(pdev, i2c_dev);
 
-	clk_disable(i2c_dev->clk);
+	pm_runtime_set_autosuspend_delay(i2c_dev->dev,
+					 STM32F7_AUTOSUSPEND_DELAY);
+	pm_runtime_use_autosuspend(i2c_dev->dev);
+	pm_runtime_set_active(i2c_dev->dev);
+	pm_runtime_enable(i2c_dev->dev);
+
+	pm_runtime_get_noresume(&pdev->dev);
+
+	stm32f7_i2c_hw_config(i2c_dev);
+
+	ret = i2c_add_adapter(adap);
+	if (ret)
+		goto pm_disable;
 
 	dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
 
+	pm_runtime_mark_last_busy(i2c_dev->dev);
+	pm_runtime_put_autosuspend(i2c_dev->dev);
+
 	return 0;
 
+pm_disable:
+	pm_runtime_put_noidle(i2c_dev->dev);
+	pm_runtime_disable(i2c_dev->dev);
+	pm_runtime_set_suspended(i2c_dev->dev);
+	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
+
 clk_free:
 	clk_disable_unprepare(i2c_dev->clk);
 
@@ -1936,11 +1986,50 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
 	}
 
 	i2c_del_adapter(&i2c_dev->adap);
+	pm_runtime_get_sync(i2c_dev->dev);
 
-	clk_unprepare(i2c_dev->clk);
+	clk_disable_unprepare(i2c_dev->clk);
+
+	pm_runtime_put_noidle(i2c_dev->dev);
+	pm_runtime_disable(i2c_dev->dev);
+	pm_runtime_set_suspended(i2c_dev->dev);
+	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int stm32f7_i2c_runtime_suspend(struct device *dev)
+{
+	struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+
+	if (!stm32f7_i2c_is_slave_registered(i2c_dev))
+		clk_disable_unprepare(i2c_dev->clk);
+
+	return 0;
+}
+
+static int stm32f7_i2c_runtime_resume(struct device *dev)
+{
+	struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+	int ret;
+
+	if (!stm32f7_i2c_is_slave_registered(i2c_dev)) {
+		ret = clk_prepare_enable(i2c_dev->clk);
+		if (ret) {
+			dev_err(dev, "failed to prepare_enable clock\n");
+			return ret;
+		}
+	}
 
 	return 0;
 }
+#endif
+
+static const struct dev_pm_ops stm32f7_i2c_pm_ops = {
+	SET_RUNTIME_PM_OPS(stm32f7_i2c_runtime_suspend,
+			   stm32f7_i2c_runtime_resume, NULL)
+};
 
 static const struct of_device_id stm32f7_i2c_match[] = {
 	{ .compatible = "st,stm32f7-i2c", .data = &stm32f7_setup},
@@ -1952,6 +2041,7 @@ static struct platform_driver stm32f7_i2c_driver = {
 	.driver = {
 		.name = "stm32f7-i2c",
 		.of_match_table = stm32f7_i2c_match,
+		.pm = &stm32f7_i2c_pm_ops,
 	},
 	.probe = stm32f7_i2c_probe,
 	.remove = stm32f7_i2c_remove,

drivers/i2c/busses/i2c-tegra.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/i2c/busses/i2c-tegra.c
  *
  * Copyright (C) 2010 Google, Inc.
  * Author: Colin Cross <ccross@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  */
 
 #include <linux/kernel.h>
@@ -145,8 +136,8 @@ enum msg_end_type {
  * @has_continue_xfer_support: Continue transfer supports.
  * @has_per_pkt_xfer_complete_irq: Has enable/disable capability for transfer
  *		complete interrupt per packet basis.
- * @has_single_clk_source: The i2c controller has single clock source. Tegra30
- *		and earlier Socs has two clock sources i.e. div-clk and
+ * @has_single_clk_source: The I2C controller has single clock source. Tegra30
+ *		and earlier SoCs have two clock sources i.e. div-clk and
  *		fast-clk.
  * @has_config_load_reg: Has the config load register to load the new
  *		configuration.
@@ -154,8 +145,17 @@ enum msg_end_type {
  * @clk_divisor_std_fast_mode: Clock divisor in standard/fast mode. It is
  *		applicable if there is no fast clock source i.e. single clock
  *		source.
+ * @clk_divisor_fast_plus_mode: Clock divisor in fast mode plus. It is
+ *		applicable if there is no fast clock source (i.e. single
+ *		clock source).
+ * @has_multi_master_mode: The I2C controller supports running in single-master
+ *		or multi-master mode.
+ * @has_slcg_override_reg: The I2C controller supports a register that
+ *		overrides the second level clock gating.
+ * @has_mst_fifo: The I2C controller contains the new MST FIFO interface that
+ *		provides additional features and allows for longer messages to
+ *		be transferred in one go.
  */
-
 struct tegra_i2c_hw_feature {
 	bool has_continue_xfer_support;
 	bool has_per_pkt_xfer_complete_irq;
@@ -170,22 +170,27 @@ struct tegra_i2c_hw_feature {
 };
 
 /**
- * struct tegra_i2c_dev	- per device i2c context
+ * struct tegra_i2c_dev - per device I2C context
  * @dev: device reference for power management
- * @hw: Tegra i2c hw feature.
- * @adapter: core i2c layer adapter information
- * @div_clk: clock reference for div clock of i2c controller.
- * @fast_clk: clock reference for fast clock of i2c controller.
+ * @hw: Tegra I2C HW feature
+ * @adapter: core I2C layer adapter information
+ * @div_clk: clock reference for div clock of I2C controller
+ * @fast_clk: clock reference for fast clock of I2C controller
+ * @rst: reset control for the I2C controller
  * @base: ioremapped registers cookie
- * @cont_id: i2c controller id, used for for packet header
- * @irq: irq number of transfer complete interrupt
- * @is_dvc: identifies the DVC i2c controller, has a different register layout
+ * @cont_id: I2C controller ID, used for packet header
+ * @irq: IRQ number of transfer complete interrupt
+ * @irq_disabled: used to track whether or not the interrupt is enabled
+ * @is_dvc: identifies the DVC I2C controller, has a different register layout
  * @msg_complete: transfer completion notifier
  * @msg_err: error code for completed message
  * @msg_buf: pointer to current message data
  * @msg_buf_remaining: size of unsent data in the message buffer
  * @msg_read: identifies read transfers
- * @bus_clk_rate: current i2c bus clock rate
+ * @bus_clk_rate: current I2C bus clock rate
+ * @clk_divisor_non_hs_mode: clock divider for non-high-speed modes
+ * @is_multimaster_mode: track if I2C controller is in multi-master mode
+ * @xfer_lock: lock to serialize transfer submission and processing
  */
 struct tegra_i2c_dev {
 	struct device *dev;
@@ -608,11 +613,10 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 	u32 status;
 	const u32 status_err = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
 	struct tegra_i2c_dev *i2c_dev = dev_id;
-	unsigned long flags;
 
 	status = i2c_readl(i2c_dev, I2C_INT_STATUS);
 
-	spin_lock_irqsave(&i2c_dev->xfer_lock, flags);
+	spin_lock(&i2c_dev->xfer_lock);
 	if (status == 0) {
 		dev_warn(i2c_dev->dev, "irq status 0 %08x %08x %08x\n",
 			 i2c_readl(i2c_dev, I2C_PACKET_TRANSFER_STATUS),
@@ -670,7 +674,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 
 	complete(&i2c_dev->msg_complete);
 done:
-	spin_unlock_irqrestore(&i2c_dev->xfer_lock, flags);
+	spin_unlock(&i2c_dev->xfer_lock);
 	return IRQ_HANDLED;
 }