pinmux_show allows to display the muxing of all pins
belonging to pin-controller.
Signed-off-by: Patrice Chotard <patrice.chot...@st.com>
---
drivers/pinctrl/pinctrl_stm32.c | 79 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/drivers/pinctrl/pinctrl_stm32.c b/drivers/pinctrl/pinctrl_stm32.c
index 31285cdd5784..a477035bf420 100644
--- a/drivers/pinctrl/pinctrl_stm32.c
+++ b/drivers/pinctrl/pinctrl_stm32.c
@@ -14,6 +14,16 @@ DECLARE_GLOBAL_DATA_PTR;
#define OTYPE_MSK 1
#define AFR_MASK 0xF
+#define PINMUX_MODE_COUNT 5
+
+static const char * const pinmux_mode[PINMUX_MODE_COUNT] = {
+ "gpio input",
+ "gpio output",
+ "analog",
+ "unknown",
+ "alt function",
+};
+
static int stm32_gpio_config(struct gpio_desc *desc,
const struct stm32_gpio_ctl *ctl)
{
@@ -176,12 +186,81 @@ static int stm32_pinctrl_set_state_simple(struct udevice
*dev,
}
#endif /* PINCTRL_FULL */
+static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ u32 af;
+ u32 alt_shift = (offset % 8) * 4;
+ u32 alt_index = offset / 8;
+
+ af = (readl(®s->afr[alt_index]) &
+ GENMASK(alt_shift + 3, alt_shift)) >> alt_shift;
+
+ return af;
+}
+
+static int stm32_pinmux_show(struct udevice *dev)
+{
+ struct udevice *child;
+ struct udevice *dev_gpio;
+ const char *bank_name;
+ const char *label;
+ int offset;
+ int ret;
+ int num_bits;
+ int mode;
+ int af_num;
+
+ /* parse pin-controller sub-nodes, ie gpio bank nodes */
+ list_for_each_entry(child, &dev->child_head, sibling_node) {
+ ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
+ &dev_gpio);
+
+ if (ret < 0 && ret != -ENODEV) {
+ dev_err(dev, "Failed to find %s device ret = %d\n",
+ child->name, ret);
+ return ret;
+ }
+
+ if (!ret) {
+ bank_name = gpio_get_bank_info(dev_gpio, &num_bits);
+
+ printf("\nBank %s:\n", bank_name);
+ for (offset = 0; offset < num_bits; offset++) {
+ mode = gpio_get_raw_function(dev_gpio,
+ offset, &label);
+ printf("%s%d: %s", bank_name, offset,
+ pinmux_mode[mode]);
+ switch (mode) {
+ case GPIOF_FUNC:
+ af_num = stm32_pinctrl_get_af(dev_gpio,
+ offset);
+ printf(" %d", af_num);
+ break;
+ case STM32_GPIO_MODE_OUT:
+ case STM32_GPIO_MODE_IN:
+ printf(" %s", label ? label : "");
+ break;
+ }
+ printf("\n");
+ }
+ }
+
+ if (!child)
+ break;
+ }
+
+ return 0;
+}
+
static struct pinctrl_ops stm32_pinctrl_ops = {
#if CONFIG_IS_ENABLED(PINCTRL_FULL)
.set_state = stm32_pinctrl_set_state,
#else /* PINCTRL_FULL */
.set_state_simple = stm32_pinctrl_set_state_simple,
#endif /* PINCTRL_FULL */
+ .pinmux_show = stm32_pinmux_show,
};
static const struct udevice_id stm32_pinctrl_ids[] = {
--
1.9.1
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