[RFC PATCH 03/23] sunxi: pinctrl: Implement get_pin_muxing function

[Samuel Holland]

The pinmux command uses this function to display pinmux status.

Since the driver cannot map pin numbers to a list of supported
functions, only functions which are common across all pins can be
reported by name.

Signed-off-by: Samuel Holland <sam...@sholland.org>
---

 drivers/pinctrl/sunxi/pinctrl-sunxi.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c 
b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index bbda954f31..e67c276a33 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -66,6 +66,32 @@ static int sunxi_pinctrl_pinmux_set(struct udevice *dev, 
uint pin_selector,
        return 0;
 }
 
+static int sunxi_pinctrl_get_pin_muxing(struct udevice *dev, uint pin_selector,
+                                       char *buf, int size)
+{
+       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;
+       int mux  = sunxi_gpio_get_cfgbank(plat->base + bank, pin);
+
+       switch (mux) {
+       case SUNXI_GPIO_INPUT:
+               strlcpy(buf, "gpio input", size);
+               break;
+       case SUNXI_GPIO_OUTPUT:
+               strlcpy(buf, "gpio output", size);
+               break;
+       case SUNXI_GPIO_DISABLE:
+               strlcpy(buf, "disabled", size);
+               break;
+       default:
+               snprintf(buf, size, "function %d", mux);
+               break;
+       }
+
+       return 0;
+}
+
 const struct pinctrl_ops sunxi_pinctrl_ops = {
        .get_pins_count         = sunxi_pinctrl_get_pins_count,
        .get_pin_name           = sunxi_pinctrl_get_pin_name,
@@ -73,6 +99,7 @@ const struct pinctrl_ops sunxi_pinctrl_ops = {
        .get_function_name      = sunxi_pinctrl_get_function_name,
        .pinmux_set             = sunxi_pinctrl_pinmux_set,
        .set_state              = pinctrl_generic_set_state,
+       .get_pin_muxing         = sunxi_pinctrl_get_pin_muxing,
 };
 
 int sunxi_pinctrl_bind(struct udevice *dev)
-- 
2.32.0