mfd: arizona: Update reset pin to use GPIOD

Now GPIOD has support for both pdata systems and for non-standard DT
bindings the Arizona reset GPIO can be converted to use it. Worth
noting gpiod_set_raw_value_cansleep is used to match the behaviour
of the old GPIOs. This is because the part is fairly widely used and
it is unknown how many DTs are correctly setting active low through
device tree, so to avoid breaking any existing users it is best to
match the previous behaviour.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 77875250abe590bb73ba2b52ba3c38c444552579..83f1c5a516d99a974bd399c6fad01a3bcb7a59df 100644 (file)
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -13,13 +13,12 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
@@ -279,7 +278,7 @@ static int arizona_wait_for_boot(struct arizona *arizona)
 static inline void arizona_enable_reset(struct arizona *arizona)
 {
        if (arizona->pdata.reset)
-               gpio_set_value_cansleep(arizona->pdata.reset, 0);
+               gpiod_set_raw_value_cansleep(arizona->pdata.reset, 0);
 }
 
 static void arizona_disable_reset(struct arizona *arizona)
@@ -295,7 +294,7 @@ static void arizona_disable_reset(struct arizona *arizona)
                        break;
                }
 
-               gpio_set_value_cansleep(arizona->pdata.reset, 1);
+               gpiod_set_raw_value_cansleep(arizona->pdata.reset, 1);
                usleep_range(1000, 5000);
        }
 }
@@ -799,14 +798,27 @@ static int arizona_of_get_core_pdata(struct arizona *arizona)
        struct arizona_pdata *pdata = &arizona->pdata;
        int ret, i;
 
-       pdata->reset = of_get_named_gpio(arizona->dev->of_node, "wlf,reset", 0);
-       if (pdata->reset == -EPROBE_DEFER) {
-               return pdata->reset;
-       } else if (pdata->reset < 0) {
-               dev_err(arizona->dev, "Reset GPIO missing/malformed: %d\n",
-                       pdata->reset);
+       /* Handle old non-standard DT binding */
+       pdata->reset = devm_gpiod_get_from_of_node(arizona->dev,
+                                                  arizona->dev->of_node,
+                                                  "wlf,reset", 0,
+                                                  GPIOD_OUT_LOW,
+                                                  "arizona /RESET");
+       if (IS_ERR(pdata->reset)) {
+               ret = PTR_ERR(pdata->reset);
 
-               pdata->reset = 0;
+               /*
+                * Reset missing will be caught when other binding is read
+                * but all other errors imply this binding is in use but has
+                * encountered a problem so should be handled.
+                */
+               if (ret == -EPROBE_DEFER)
+                       return ret;
+               else if (ret != -ENOENT && ret != -ENOSYS)
+                       dev_err(arizona->dev, "Reset GPIO malformed: %d\n",
+                               ret);
+
+               pdata->reset = NULL;
        }
 
        ret = of_property_read_u32_array(arizona->dev->of_node,
@@ -1050,14 +1062,19 @@ int arizona_dev_init(struct arizona *arizona)
                goto err_early;
        }
 
-       if (arizona->pdata.reset) {
+       if (!arizona->pdata.reset) {
                /* Start out with /RESET low to put the chip into reset */
-               ret = devm_gpio_request_one(arizona->dev, arizona->pdata.reset,
-                                           GPIOF_DIR_OUT | GPIOF_INIT_LOW,
-                                           "arizona /RESET");
-               if (ret != 0) {
-                       dev_err(dev, "Failed to request /RESET: %d\n", ret);
-                       goto err_dcvdd;
+               arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset",
+                                                     GPIOD_OUT_LOW);
+               if (IS_ERR(arizona->pdata.reset)) {
+                       ret = PTR_ERR(arizona->pdata.reset);
+                       if (ret == -EPROBE_DEFER)
+                               goto err_dcvdd;
+
+                       dev_err(arizona->dev,
+                               "Reset GPIO missing/malformed: %d\n", ret);
+
+                       arizona->pdata.reset = NULL;
                }
        }
 

diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index f72dc53848d705b3d09d57d9df466fb796e51669..0013075d4cda0615c9f0a254c786d35ebb0eec79 100644 (file)
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -56,6 +56,7 @@
 #define ARIZONA_MAX_PDM_SPK 2
 
 struct regulator_init_data;
+struct gpio_desc;
 
 struct arizona_micbias {
        int mV;                    /** Regulated voltage */
@@ -77,7 +78,7 @@ struct arizona_micd_range {
 };
 
 struct arizona_pdata {
-       int reset;      /** GPIO controlling /RESET, if any */
+       struct gpio_desc *reset;      /** GPIO controlling /RESET, if any */
 
        /** Regulator configuration for MICVDD */
        struct arizona_micsupp_pdata micvdd;