regulator: wm831x: Convert to use GPIO descriptors

This converts the Wolfson Micro WM831x DCDC converter to use
a GPIO descriptor for the GPIO driving the DVS pin.

There is just one (non-DT) machine in the kernel using this, and
that is the Wolfson Micro (now Cirrus) Cragganmore 6410 so we
patch this board to pass a descriptor table and fix up the driver
accordingly.

Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: Richard Fitzgerald <rf@opensource.cirrus.com>
Cc: patches@opensource.cirrus.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/arch/arm/mach-s3c64xx/mach-crag6410.c b/arch/arm/mach-s3c64xx/mach-crag6410.c
index 379424d..8ec6a4f 100644 (file)
--- a/arch/arm/mach-s3c64xx/mach-crag6410.c
+++ b/arch/arm/mach-s3c64xx/mach-crag6410.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/init.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/leds.h>
 #include <linux/delay.h>
 #include <linux/mmc/host.h>
@@ -398,7 +399,6 @@ static struct pca953x_platform_data crag6410_pca_data = {
 /* VDDARM is controlled by DVS1 connected to GPK(0) */
 static struct wm831x_buckv_pdata vddarm_pdata = {
        .dvs_control_src = 1,
-       .dvs_gpio = S3C64XX_GPK(0),
 };
 
 static struct regulator_consumer_supply vddarm_consumers[] = {
@@ -596,6 +596,24 @@ static struct wm831x_pdata crag_pmic_pdata = {
        .touch = &touch_pdata,
 };
 
+/*
+ * VDDARM is eventually ending up as a regulator hanging on the MFD cell device
+ * "wm831x-buckv.1" spawn from drivers/mfd/wm831x-core.c.
+ *
+ * From the note on the platform data we can see that this is clearly DVS1
+ * and assigned as dcdc1 resource to the MFD core which sets .id of the cell
+ * spawning the DVS1 platform device to 1, then the cell platform device
+ * name is calculated from 10*instance + id resulting in the device name
+ * "wm831x-buckv.11"
+ */
+static struct gpiod_lookup_table crag_pmic_gpiod_table = {
+       .dev_id = "wm831x-buckv.11",
+       .table = {
+               GPIO_LOOKUP("GPIOK", 0, "dvs", GPIO_ACTIVE_HIGH),
+               { },
+       },
+};
+
 static struct i2c_board_info i2c_devs0[] = {
        { I2C_BOARD_INFO("24c08", 0x50), },
        { I2C_BOARD_INFO("tca6408", 0x20),
@@ -836,6 +854,7 @@ static void __init crag6410_machine_init(void)
        s3c_fb_set_platdata(&crag6410_lcd_pdata);
        dwc2_hsotg_set_platdata(&crag6410_hsotg_pdata);
 
+       gpiod_add_lookup_table(&crag_pmic_gpiod_table);
        i2c_register_board_info(0, i2c_devs0, ARRAY_SIZE(i2c_devs0));
        i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));
 

diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index b422eef..018dbbd 100644 (file)
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -15,7 +15,7 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 
 #include <linux/mfd/wm831x/core.h>
@@ -50,7 +50,7 @@ struct wm831x_dcdc {
        int base;
        struct wm831x *wm831x;
        struct regulator_dev *regulator;
-       int dvs_gpio;
+       struct gpio_desc *dvs_gpiod;
        int dvs_gpio_state;
        int on_vsel;
        int dvs_vsel;
@@ -217,7 +217,7 @@ static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
                return 0;
 
        dcdc->dvs_gpio_state = state;
-       gpio_set_value(dcdc->dvs_gpio, state);
+       gpiod_set_value(dcdc->dvs_gpiod, state);
 
        /* Should wait for DVS state change to be asserted if we have
         * a GPIO for it, for now assume the device is configured
@@ -237,10 +237,10 @@ static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
        int ret;
 
        /* If this value is already set then do a GPIO update if we can */
-       if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
+       if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
                return wm831x_buckv_set_dvs(rdev, 0);
 
-       if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
+       if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
                return wm831x_buckv_set_dvs(rdev, 1);
 
        /* Always set the ON status to the minimum voltage */
@@ -249,7 +249,7 @@ static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
                return ret;
        dcdc->on_vsel = vsel;
 
-       if (!dcdc->dvs_gpio)
+       if (!dcdc->dvs_gpiod)
                return ret;
 
        /* Kick the voltage transition now */
@@ -296,7 +296,7 @@ static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 {
        struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 
-       if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
+       if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
                return dcdc->dvs_vsel;
        else
                return dcdc->on_vsel;
@@ -337,7 +337,7 @@ static void wm831x_buckv_dvs_init(struct platform_device *pdev,
        int ret;
        u16 ctrl;
 
-       if (!pdata || !pdata->dvs_gpio)
+       if (!pdata)
                return;
 
        /* gpiolib won't let us read the GPIO status so pick the higher
@@ -345,17 +345,14 @@ static void wm831x_buckv_dvs_init(struct platform_device *pdev,
         */
        dcdc->dvs_gpio_state = pdata->dvs_init_state;
 
-       ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
-                                   dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
-                                   "DCDC DVS");
-       if (ret < 0) {
-               dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
-                       dcdc->name, ret);
+       dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
+                       dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
+       if (IS_ERR(dcdc->dvs_gpiod)) {
+               dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
+                       dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
                return;
        }
 
-       dcdc->dvs_gpio = pdata->dvs_gpio;
-
        switch (pdata->dvs_control_src) {
        case 1:
                ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;

diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index dcc9631..1b8bb36 100644 (file)
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -52,7 +52,6 @@ struct wm831x_battery_pdata {
  * I2C or SPI buses.
  */
 struct wm831x_buckv_pdata {
-       int dvs_gpio;        /** CPU GPIO to use for DVS switching */
        int dvs_control_src; /** Hardware DVS source to use (1 or 2) */
        int dvs_init_state;  /** DVS state to expect on startup */
        int dvs_state_gpio;  /** CPU GPIO to use for monitoring status */