diff options
Diffstat (limited to 'drivers/gpio/qcom_pmic_gpio.c')
| -rw-r--r-- | drivers/gpio/qcom_pmic_gpio.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/gpio/qcom_pmic_gpio.c b/drivers/gpio/qcom_pmic_gpio.c index f2ef4e5ce14..cd9f3926ac4 100644 --- a/drivers/gpio/qcom_pmic_gpio.c +++ b/drivers/gpio/qcom_pmic_gpio.c @@ -69,6 +69,17 @@ #define REG_EN_CTL 0x46 #define REG_EN_CTL_ENABLE (1 << 7) +/** + * pmic_gpio_match_data - platform specific configuration + * + * @PMIC_MATCH_READONLY: treat all GPIOs as readonly, don't attempt to configure them. + * This is a workaround for an unknown bug on some platforms where trying to write the + * GPIO configuration registers causes the board to hang. + */ +enum pmic_gpio_quirks { + QCOM_PMIC_QUIRK_READONLY = (1 << 0), +}; + struct qcom_pmic_gpio_data { uint32_t pid; /* Peripheral ID on SPMI bus */ bool lv_mv_type; /* If subtype is GPIO_LV(0x10) or GPIO_MV(0x11) */ @@ -117,8 +128,13 @@ static int qcom_gpio_set_direction(struct udevice *dev, unsigned int offset, { struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); uint32_t gpio_base = plat->pid + REG_OFFSET(offset); + ulong quirks = dev_get_driver_data(dev); int ret = 0; + /* Some PMICs don't like their GPIOs being configured */ + if (quirks & QCOM_PMIC_QUIRK_READONLY) + return 0; + /* Disable the GPIO */ ret = pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL, REG_EN_CTL_ENABLE, 0); @@ -262,6 +278,7 @@ static int qcom_gpio_bind(struct udevice *dev) { struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + ulong quirks = dev_get_driver_data(dev); struct udevice *child; struct driver *drv; int ret; @@ -275,7 +292,7 @@ static int qcom_gpio_bind(struct udevice *dev) /* Bind the GPIO driver as a child of the PMIC. */ ret = device_bind_with_driver_data(dev, drv, dev->name, - 0, dev_ofnode(dev), &child); + quirks, dev_ofnode(dev), &child); if (ret) return log_msg_ret("bind", ret); @@ -348,7 +365,7 @@ static const struct udevice_id qcom_gpio_ids[] = { { .compatible = "qcom,pms405-gpio" }, { .compatible = "qcom,pm6125-gpio" }, { .compatible = "qcom,pm8150-gpio" }, - { .compatible = "qcom,pm8550-gpio" }, + { .compatible = "qcom,pm8550-gpio", .data = QCOM_PMIC_QUIRK_READONLY }, { } }; |