[U-Boot] [PATCH 4/4] pinctrl: meson-axg: add support for getting pinmux status

[Neil Armstrong]

In order to support the "pinmux status" command, use the common functions
to get the pins count and names, and add the AXG specific function to get
the current function from registers.

Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
 drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c
index f23b188f2f..10b070ea06 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c
@@ -93,6 +93,51 @@ static int meson_axg_pinmux_group_set(struct udevice *dev,
 	return 0;
 }
 
+static int meson_axg_pinmux_get(struct udevice *dev, unsigned int selector,
+				char *buf, int size)
+{
+	struct meson_pinctrl *priv = dev_get_priv(dev);
+	struct meson_pmx_axg_data *pmx_data;
+	struct meson_pmx_group *group;
+	struct meson_pmx_bank *bank;
+	unsigned int offset;
+	unsigned int func;
+	unsigned int reg;
+	int ret, i, j;
+
+	selector += priv->data->pin_base;
+
+	ret = meson_axg_pmx_get_bank(dev, selector, &bank);
+	if (ret) {
+		snprintf(buf, size, "Unhandled");
+		return 0;
+	}
+
+	meson_axg_pmx_calc_reg_and_offset(bank, selector, &reg, &offset);
+
+	func = (readl(priv->reg_mux + (reg << 2)) >> offset) & 0xf;
+
+	for (i = 0; i < priv->data->num_groups; i++) {
+		group = &priv->data->groups[i];
+		pmx_data = (struct meson_pmx_axg_data *)group->data;
+
+		if (pmx_data->func != func)
+			continue;
+
+		for (j = 0; j < group->num_pins; j++) {
+			if (group->pins[j] == selector) {
+				snprintf(buf, size, "%s (%x)",
+					 group->name, func);
+				return 0;
+			}
+		}
+	}
+
+	snprintf(buf, size, "Unknown (%x)", func);
+
+	return 0;
+}
+
 const struct pinconf_param meson_axg_pinconf_params[] = {
 	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
@@ -110,6 +155,9 @@ const struct pinctrl_ops meson_axg_pinctrl_ops = {
 	.pinconf_num_params = ARRAY_SIZE(meson_axg_pinconf_params),
 	.pinconf_set = meson_pinconf_set,
 	.pinconf_group_set = meson_pinconf_group_set,
+	.get_pin_name = meson_pinctrl_get_pin_name,
+	.get_pins_count = meson_pinctrl_get_pins_count,
+	.get_pin_muxing	= meson_axg_pinmux_get,
 };
 
 static int meson_axg_gpio_request(struct udevice *dev,
-- 
2.21.0