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pinctrl: stm32: add information on pin configuration 

Add information on pin configuration used for pinmux command:
- bias configuration for output (disable, pull up, pull down)
- otype for input (open drain or push pull)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-06-04 14:30:33 +02:00
parent 5593333c2e
commit da7a0bb1f2
1 changed files with 24 additions and 3 deletions
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27
drivers/pinctrl/pinctrl_stm32.c
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@ -45,6 +45,17 @@ static const char * const pinmux_mode[PINMUX_MODE_COUNT] = {
"alt function",
};
static const char * const pinmux_output[] = {
[STM32_GPIO_PUPD_NO] = "bias-disable",
[STM32_GPIO_PUPD_UP] = "bias-pull-up",
[STM32_GPIO_PUPD_DOWN] = "bias-pull-down",
};
static const char * const pinmux_input[] = {
[STM32_GPIO_OTYPE_PP] = "drive-push-pull",
[STM32_GPIO_OTYPE_OD] = "drive-open-drain",
};
static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
@ -182,10 +193,12 @@ static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
int size)
{
struct udevice *gpio_dev;
struct stm32_gpio_priv *priv;
const char *label;
int mode;
int af_num;
unsigned int gpio_idx;
u32 pupd, otype;
/* look up for the bank which owns the requested pin */
gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
@ -194,9 +207,9 @@ static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
return -ENODEV;
mode = gpio_get_raw_function(gpio_dev, gpio_idx, &label);
dev_dbg(dev, "selector = %d gpio_idx = %d mode = %d\n",
selector, gpio_idx, mode);
priv = dev_get_priv(gpio_dev);
switch (mode) {
@ -211,9 +224,17 @@ static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
snprintf(buf, size, "%s %d", pinmux_mode[mode], af_num);
break;
case GPIOF_OUTPUT:
pupd = (readl(&priv->regs->pupdr) >> (gpio_idx * 2)) &
PUPD_MASK;
snprintf(buf, size, "%s %s %s",
pinmux_mode[mode], pinmux_output[pupd],
label ? label : "");
break;
case GPIOF_INPUT:
snprintf(buf, size, "%s %s",
pinmux_mode[mode], label ? label : "");
otype = (readl(&priv->regs->otyper) >> gpio_idx) & OTYPE_MSK;
snprintf(buf, size, "%s %s %s",
pinmux_mode[mode], pinmux_input[otype],
label ? label : "");
break;
}