[PATCH v2 04/23] sunxi: pinctrl: Implement pin configuration

[Samuel Holland]

The sunxi pinctrl hardware has bias and drive control. Add driver
support for configuring those options.

Reviewed-by: Simon Glass <s...@chromium.org>
Signed-off-by: Samuel Holland <sam...@sholland.org>
---

(no changes since v1)

 drivers/pinctrl/sunxi/Kconfig         |  1 +
 drivers/pinctrl/sunxi/pinctrl-sunxi.c | 53 +++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/pinctrl/sunxi/Kconfig b/drivers/pinctrl/sunxi/Kconfig
index f4949f89e0..77da90836b 100644
--- a/drivers/pinctrl/sunxi/Kconfig
+++ b/drivers/pinctrl/sunxi/Kconfig
@@ -5,6 +5,7 @@ if ARCH_SUNXI
 config PINCTRL_SUNXI
        select PINCTRL_FULL
        select PINCTRL_GENERIC
+       select PINCONF
        select PINMUX
        bool
 
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c 
b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 4e453cec54..24b9647054 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -82,6 +82,56 @@ static int sunxi_pinctrl_pinmux_set(struct udevice *dev, 
uint pin_selector,
        return 0;
 }
 
+static const struct pinconf_param sunxi_pinctrl_pinconf_params[] = {
+       { "bias-disable",       PIN_CONFIG_BIAS_DISABLE,         0 },
+       { "bias-pull-down",     PIN_CONFIG_BIAS_PULL_DOWN,       2 },
+       { "bias-pull-up",       PIN_CONFIG_BIAS_PULL_UP,         1 },
+       { "drive-strength",     PIN_CONFIG_DRIVE_STRENGTH,      10 },
+};
+
+static int sunxi_pinctrl_pinconf_set_pull(struct sunxi_pinctrl_plat *plat,
+                                         uint bank, uint pin, uint bias)
+{
+       struct sunxi_gpio *regs = &plat->base[bank];
+
+       sunxi_gpio_set_pull_bank(regs, pin, bias);
+
+       return 0;
+}
+
+static int sunxi_pinctrl_pinconf_set_drive(struct sunxi_pinctrl_plat *plat,
+                                          uint bank, uint pin, uint drive)
+{
+       struct sunxi_gpio *regs = &plat->base[bank];
+
+       if (drive < 10 || drive > 40)
+               return -EINVAL;
+
+       /* Convert mA to the register value, rounding down. */
+       sunxi_gpio_set_drv_bank(regs, pin, drive / 10 - 1);
+
+       return 0;
+}
+
+static int sunxi_pinctrl_pinconf_set(struct udevice *dev, uint pin_selector,
+                                    uint param, uint val)
+{
+       struct sunxi_pinctrl_plat *plat = dev_get_plat(dev);
+       int bank = pin_selector / SUNXI_GPIOS_PER_BANK;
+       int pin  = pin_selector % SUNXI_GPIOS_PER_BANK;
+
+       switch (param) {
+       case PIN_CONFIG_BIAS_DISABLE:
+       case PIN_CONFIG_BIAS_PULL_DOWN:
+       case PIN_CONFIG_BIAS_PULL_UP:
+               return sunxi_pinctrl_pinconf_set_pull(plat, bank, pin, val);
+       case PIN_CONFIG_DRIVE_STRENGTH:
+               return sunxi_pinctrl_pinconf_set_drive(plat, bank, pin, val);
+       }
+
+       return -EINVAL;
+}
+
 static int sunxi_pinctrl_get_pin_muxing(struct udevice *dev, uint pin_selector,
                                        char *buf, int size)
 {
@@ -114,6 +164,9 @@ static const struct pinctrl_ops sunxi_pinctrl_ops = {
        .get_functions_count    = sunxi_pinctrl_get_functions_count,
        .get_function_name      = sunxi_pinctrl_get_function_name,
        .pinmux_set             = sunxi_pinctrl_pinmux_set,
+       .pinconf_num_params     = ARRAY_SIZE(sunxi_pinctrl_pinconf_params),
+       .pinconf_params         = sunxi_pinctrl_pinconf_params,
+       .pinconf_set            = sunxi_pinctrl_pinconf_set,
        .set_state              = pinctrl_generic_set_state,
        .get_pin_muxing         = sunxi_pinctrl_get_pin_muxing,
 };
-- 
2.33.1