diff options
| author | Fabien Dessenne <fabien.dessenne@foss.st.com> | 2025-06-10 17:23:06 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2025-06-18 11:24:20 +0200 |
| commit | 4cdf874f67adfdec4f0a288c76f9aba05f9babe2 (patch) | |
| tree | 6f60229f5faa401bf1dbad5f337b3f125a0eb54b | |
| parent | a88ca6deca4f19c95811433aa23bab7b74d182bb (diff) | |
dt-bindings: pinctrl: stm32: Add RSVD mux function
Document the RSVD (Reserved) mux function, used to reserve pins
for a coprocessor not running Linux.
Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/20250610152309.299438-3-antonio.borneo@foss.st.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml | 8 | ||||
| -rw-r--r-- | include/dt-bindings/pinctrl/stm32-pinfunc.h | 1 |
2 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml index a28d77748095..5d17d6487ae9 100644 --- a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml +++ b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml @@ -160,9 +160,13 @@ patternProperties: * ... * 16 : Alternate Function 15 * 17 : Analog + * 18 : Reserved To simplify the usage, macro is available to generate "pinmux" field. This macro is available here: - include/dt-bindings/pinctrl/stm32-pinfunc.h + Setting the pinmux's function to the Reserved (RSVD) value is used to inform + the driver that it shall not apply the mux setting. This can be used to + reserve some pins, for example to a co-processor not running Linux. Some examples of using macro: /* GPIO A9 set as alternate function 2 */ ... { @@ -176,6 +180,10 @@ patternProperties: ... { pinmux = <STM32_PINMUX('A', 9, ANALOG)>; }; + /* GPIO A9 reserved for co-processor */ + ... { + pinmux = <STM32_PINMUX('A', 9, RSVD)>; + }; bias-disable: type: boolean diff --git a/include/dt-bindings/pinctrl/stm32-pinfunc.h b/include/dt-bindings/pinctrl/stm32-pinfunc.h index 28ad0235086a..af3fd388329a 100644 --- a/include/dt-bindings/pinctrl/stm32-pinfunc.h +++ b/include/dt-bindings/pinctrl/stm32-pinfunc.h @@ -26,6 +26,7 @@ #define AF14 0xf #define AF15 0x10 #define ANALOG 0x11 +#define RSVD 0x12 /* define Pins number*/ #define PIN_NO(port, line) (((port) - 'A') * 0x10 + (line)) |