regulator: s5m8767: Use GPIO for controlling Buck9/eMMC

Add support for GPIO control (enable/disable) over Buck9. The Buck9
Converter is used as a supply for eMMC Host Controller.

BUCK9EN GPIO of S5M8767 chip may be used by application processor to
enable or disable the Buck9. This has two benefits:
 - It is faster than toggling it over I2C bus.
 - It allows disabling the regulator during suspend to RAM; The AP will
   enable it during resume; Without the patch the regulator supplying
   eMMC must be defined as fixed-regulator.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c
index d7164bb..6850a25 100644 (file)
--- a/drivers/regulator/s5m8767.c
+++ b/drivers/regulator/s5m8767.c
@@ -11,11 +11,8 @@
  *
  */
 
-#include <linux/bug.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/of_gpio.h>
-#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
@@ -483,6 +480,65 @@ static struct regulator_desc regulators[] = {
        s5m8767_regulator_desc(BUCK9),
 };
 
+/*
+ * Enable GPIO control over BUCK9 in regulator_config for that regulator.
+ */
+static void s5m8767_regulator_config_ext_control(struct s5m8767_info *s5m8767,
+               struct sec_regulator_data *rdata,
+               struct regulator_config *config)
+{
+       int i, mode = 0;
+
+       if (rdata->id != S5M8767_BUCK9)
+               return;
+
+       /* Check if opmode for regulator matches S5M8767_ENCTRL_USE_GPIO */
+       for (i = 0; i < s5m8767->num_regulators; i++) {
+               const struct sec_opmode_data *opmode = &s5m8767->opmode[i];
+               if (opmode->id == rdata->id) {
+                       mode = s5m8767_opmode_reg[rdata->id][opmode->mode];
+                       break;
+               }
+       }
+       if (mode != S5M8767_ENCTRL_USE_GPIO) {
+               dev_warn(s5m8767->dev,
+                               "ext-control for %s: mismatched op_mode (%x), ignoring\n",
+                               rdata->reg_node->name, mode);
+               return;
+       }
+
+       if (!gpio_is_valid(rdata->ext_control_gpio)) {
+               dev_warn(s5m8767->dev,
+                               "ext-control for %s: GPIO not valid, ignoring\n",
+                               rdata->reg_node->name);
+               return;
+       }
+
+       config->ena_gpio = rdata->ext_control_gpio;
+       config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
+}
+
+/*
+ * Turn on GPIO control over BUCK9.
+ */
+static int s5m8767_enable_ext_control(struct s5m8767_info *s5m8767,
+               struct regulator_dev *rdev)
+{
+       int ret, reg, enable_ctrl;
+
+       if (rdev_get_id(rdev) != S5M8767_BUCK9)
+               return -EINVAL;
+
+       ret = s5m8767_get_register(rdev, &reg, &enable_ctrl);
+       if (ret)
+               return ret;
+
+       return regmap_update_bits(s5m8767->iodev->regmap_pmic,
+                       reg, S5M8767_ENCTRL_MASK,
+                       S5M8767_ENCTRL_USE_GPIO << S5M8767_ENCTRL_SHIFT);
+}
+
+
 #ifdef CONFIG_OF
 static int s5m8767_pmic_dt_parse_dvs_gpio(struct sec_pmic_dev *iodev,
                        struct sec_platform_data *pdata,
@@ -520,6 +576,16 @@ static int s5m8767_pmic_dt_parse_ds_gpio(struct sec_pmic_dev *iodev,
        return 0;
 }
 
+static void s5m8767_pmic_dt_parse_ext_control_gpio(struct sec_pmic_dev *iodev,
+               struct sec_regulator_data *rdata,
+               struct device_node *reg_np)
+{
+       rdata->ext_control_gpio = of_get_named_gpio(reg_np,
+                       "s5m8767,pmic-ext-control-gpios", 0);
+       if (!gpio_is_valid(rdata->ext_control_gpio))
+               rdata->ext_control_gpio = 0;
+}
+
 static int s5m8767_pmic_dt_parse_pdata(struct platform_device *pdev,
                                        struct sec_platform_data *pdata)
 {
@@ -574,6 +640,8 @@ static int s5m8767_pmic_dt_parse_pdata(struct platform_device *pdev,
                        continue;
                }
 
+               s5m8767_pmic_dt_parse_ext_control_gpio(iodev, rdata, reg_np);
+
                rdata->id = i;
                rdata->initdata = of_get_regulator_init_data(
                                                &pdev->dev, reg_np);
@@ -940,6 +1008,9 @@ static int s5m8767_pmic_probe(struct platform_device *pdev)
                config.driver_data = s5m8767;
                config.regmap = iodev->regmap_pmic;
                config.of_node = pdata->regulators[i].reg_node;
+               if (pdata->regulators[i].ext_control_gpio)
+                       s5m8767_regulator_config_ext_control(s5m8767,
+                                       &pdata->regulators[i], &config);
 
                rdev[i] = devm_regulator_register(&pdev->dev, &regulators[id],
                                                  &config);
@@ -949,6 +1020,16 @@ static int s5m8767_pmic_probe(struct platform_device *pdev)
                                        id);
                        return ret;
                }
+
+               if (pdata->regulators[i].ext_control_gpio) {
+                       ret = s5m8767_enable_ext_control(s5m8767, rdev[i]);
+                       if (ret < 0) {
+                               dev_err(s5m8767->dev,
+                                               "failed to enable gpio control over %s: %d\n",
+                                               rdev[i]->desc->name, ret);
+                               return ret;
+                       }
+               }
        }
 
        return 0;

diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
index 41c9bde..5551044 100644 (file)
--- a/include/linux/mfd/samsung/core.h
+++ b/include/linux/mfd/samsung/core.h
@@ -119,7 +119,8 @@ struct sec_platform_data {
 struct sec_regulator_data {
        int                             id;
        struct regulator_init_data      *initdata;
-       struct device_node *reg_node;
+       struct device_node              *reg_node;
+       int                             ext_control_gpio;
 };
 
 /*

diff --git a/include/linux/mfd/samsung/s5m8767.h b/include/linux/mfd/samsung/s5m8767.h
index 2ab0b0f..243b58f 100644 (file)
--- a/include/linux/mfd/samsung/s5m8767.h
+++ b/include/linux/mfd/samsung/s5m8767.h
@@ -183,10 +183,17 @@ enum s5m8767_regulators {
        S5M8767_REG_MAX,
 };
 
+/* LDO_EN/BUCK_EN field in registers */
 #define S5M8767_ENCTRL_SHIFT           6
 #define S5M8767_ENCTRL_MASK            (0x3 << S5M8767_ENCTRL_SHIFT)
 
 /*
+ * LDO_EN/BUCK_EN register value for controlling this Buck or LDO
+ * by GPIO (PWREN, BUCKEN).
+ */
+#define S5M8767_ENCTRL_USE_GPIO                0x1
+
+/*
  * Values for BUCK_RAMP field in DVS_RAMP register, matching raw values
  * in mV/us.
  */