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pinctrl: stm32: Handle RSVD pin configuration

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When a pin is assigned to a coprocessor not running Linux, the pin
should be flagged in the DT as reserved and not usable by Linux.

Add pin configuration RSVD (Reserved) and instrument the driver to
not update the mux setting.

Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Link: https://lore.kernel.org/20250610152309.299438-2-antonio.borneo@foss.st.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Fabien Dessenne 2025-06-10 17:23:05 +02:00 committed by Linus Walleij
parent da5b24fbf4
commit a88ca6deca
2 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pinctrl/stm32/pinctrl-stm32.c
View File

@ -91,6 +91,7 @@ static const char * const stm32_gpio_functions[] = {
"af8", "af9", "af10",
"af11", "af12", "af13",
"af14", "af15", "analog",
"reserved",
};
struct stm32_pinctrl_group {
@ -663,6 +664,9 @@ static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl,
if (pin->pin.number != pin_num)
continue;
if (fnum == STM32_PIN_RSVD)
return true;
for (k = 0; k < STM32_CONFIG_NUM; k++) {
if (func->num == fnum)
return true;
@ -962,6 +966,11 @@ static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
return -EINVAL;
}
if (function == STM32_PIN_RSVD) {
dev_dbg(pctl->dev, "Reserved pins, skipping HW update.\n");
return 0;
}
bank = gpiochip_get_data(range->gc);
pin = stm32_gpio_pin(g->pin);

3
drivers/pinctrl/stm32/pinctrl-stm32.h
View File

@ -17,7 +17,8 @@
#define STM32_PIN_GPIO 0
#define STM32_PIN_AF(x) ((x) + 1)
#define STM32_PIN_ANALOG (STM32_PIN_AF(15) + 1)
#define STM32_CONFIG_NUM (STM32_PIN_ANALOG + 1)
#define STM32_PIN_RSVD (STM32_PIN_ANALOG + 1)
#define STM32_CONFIG_NUM (STM32_PIN_RSVD + 1)
/* package information */
#define STM32MP_PKG_AA BIT(0)