i2c: cbus-gpio: Switch to use GPIO descriptors

This augments the CBUS GPIO I2C driver to use GPIO
descriptors for clock, sel and data. We drop the platform
data that was only used for carrying GPIO numbers and
use machine descriptor tables instead.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 30 insertions, 50 deletions

diff --git a/drivers/i2c/busses/i2c-cbus-gpio.c b/drivers/i2c/busses/i2c-cbus-gpio.c
index b4f91e48948a..72df563477b1 100644
--- a/drivers/i2c/busses/i2c-cbus-gpio.c
+++ b/drivers/i2c/busses/i2c-cbus-gpio.c
@@ -18,16 +18,14 @@
 
 #include <linux/io.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
-#include <linux/platform_data/i2c-cbus-gpio.h>
 
 /*
  * Bit counts are derived from Nokia implementation. These should be checked
@@ -39,9 +37,9 @@
 struct cbus_host {
 	spinlock_t	lock;		/* host lock */
 	struct device	*dev;
-	int		clk_gpio;
-	int		dat_gpio;
-	int		sel_gpio;
+	struct gpio_desc *clk;
+	struct gpio_desc *dat;
+	struct gpio_desc *sel;
 };
 
 /**
@@ -51,9 +49,9 @@ struct cbus_host {
  */
 static void cbus_send_bit(struct cbus_host *host, unsigned bit)
 {
-	gpio_set_value(host->dat_gpio, bit ? 1 : 0);
-	gpio_set_value(host->clk_gpio, 1);
-	gpio_set_value(host->clk_gpio, 0);
+	gpiod_set_value(host->dat, bit ? 1 : 0);
+	gpiod_set_value(host->clk, 1);
+	gpiod_set_value(host->clk, 0);
 }
 
 /**
@@ -78,9 +76,9 @@ static int cbus_receive_bit(struct cbus_host *host)
 {
 	int ret;
 
-	gpio_set_value(host->clk_gpio, 1);
-	ret = gpio_get_value(host->dat_gpio);
-	gpio_set_value(host->clk_gpio, 0);
+	gpiod_set_value(host->clk, 1);
+	ret = gpiod_get_value(host->dat);
+	gpiod_set_value(host->clk, 0);
 	return ret;
 }
 
@@ -123,10 +121,10 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
 	spin_lock_irqsave(&host->lock, flags);
 
 	/* Reset state and start of transfer, SEL stays down during transfer */
-	gpio_set_value(host->sel_gpio, 0);
+	gpiod_set_value(host->sel, 0);
 
 	/* Set the DAT pin to output */
-	gpio_direction_output(host->dat_gpio, 1);
+	gpiod_direction_output(host->dat, 1);
 
 	/* Send the device address */
 	cbus_send_data(host, dev, CBUS_ADDR_BITS);
@@ -141,12 +139,12 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
 		cbus_send_data(host, data, 16);
 		ret = 0;
 	} else {
-		ret = gpio_direction_input(host->dat_gpio);
+		ret = gpiod_direction_input(host->dat);
 		if (ret) {
 			dev_dbg(host->dev, "failed setting direction\n");
 			goto out;
 		}
-		gpio_set_value(host->clk_gpio, 1);
+		gpiod_set_value(host->clk, 1);
 
 		ret = cbus_receive_word(host);
 		if (ret < 0) {
@@ -156,9 +154,9 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
 	}
 
 	/* Indicate end of transfer, SEL goes up until next transfer */
-	gpio_set_value(host->sel_gpio, 1);
-	gpio_set_value(host->clk_gpio, 1);
-	gpio_set_value(host->clk_gpio, 0);
+	gpiod_set_value(host->sel, 1);
+	gpiod_set_value(host->clk, 1);
+	gpiod_set_value(host->clk, 0);
 
 out:
 	spin_unlock_irqrestore(&host->lock, flags);
@@ -214,7 +212,6 @@ static int cbus_i2c_probe(struct platform_device *pdev)
 {
 	struct i2c_adapter *adapter;
 	struct cbus_host *chost;
-	int ret;
 
 	adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter),
 			       GFP_KERNEL);
@@ -225,22 +222,20 @@ static int cbus_i2c_probe(struct platform_device *pdev)
 	if (!chost)
 		return -ENOMEM;
 
-	if (pdev->dev.of_node) {
-		struct device_node *dnode = pdev->dev.of_node;
-		if (of_gpio_count(dnode) != 3)
-			return -ENODEV;
-		chost->clk_gpio = of_get_gpio(dnode, 0);
-		chost->dat_gpio = of_get_gpio(dnode, 1);
-		chost->sel_gpio = of_get_gpio(dnode, 2);
-	} else if (dev_get_platdata(&pdev->dev)) {
-		struct i2c_cbus_platform_data *pdata =
-			dev_get_platdata(&pdev->dev);
-		chost->clk_gpio = pdata->clk_gpio;
-		chost->dat_gpio = pdata->dat_gpio;
-		chost->sel_gpio = pdata->sel_gpio;
-	} else {
+	if (gpiod_count(&pdev->dev, NULL) != 3)
 		return -ENODEV;
-	}
+	chost->clk = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_LOW);
+	if (IS_ERR(chost->clk))
+		return PTR_ERR(chost->clk);
+	chost->dat = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_IN);
+	if (IS_ERR(chost->dat))
+		return PTR_ERR(chost->dat);
+	chost->sel = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_OUT_HIGH);
+	if (IS_ERR(chost->sel))
+		return PTR_ERR(chost->sel);
+	gpiod_set_consumer_name(chost->clk, "CBUS clk");
+	gpiod_set_consumer_name(chost->dat, "CBUS dat");
+	gpiod_set_consumer_name(chost->sel, "CBUS sel");
 
 	adapter->owner		= THIS_MODULE;
 	adapter->class		= I2C_CLASS_HWMON;
@@ -254,21 +249,6 @@ static int cbus_i2c_probe(struct platform_device *pdev)
 	spin_lock_init(&chost->lock);
 	chost->dev = &pdev->dev;
 
-	ret = devm_gpio_request_one(&pdev->dev, chost->clk_gpio,
-				    GPIOF_OUT_INIT_LOW, "CBUS clk");
-	if (ret)
-		return ret;
-
-	ret = devm_gpio_request_one(&pdev->dev, chost->dat_gpio, GPIOF_IN,
-				    "CBUS data");
-	if (ret)
-		return ret;
-
-	ret = devm_gpio_request_one(&pdev->dev, chost->sel_gpio,
-				    GPIOF_OUT_INIT_HIGH, "CBUS sel");
-	if (ret)
-		return ret;
-
 	i2c_set_adapdata(adapter, chost);
 	platform_set_drvdata(pdev, adapter);