From: Ludovic Barre <[email protected]> Document the binding for stm32 sdmmc controller.
Signed-off-by: Ludovic Barre <[email protected]> --- .../devicetree/bindings/mmc/st,stm32-sdmmc.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/st,stm32-sdmmc.txt diff --git a/Documentation/devicetree/bindings/mmc/st,stm32-sdmmc.txt b/Documentation/devicetree/bindings/mmc/st,stm32-sdmmc.txt new file mode 100644 index 0000000..74d0bff --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/st,stm32-sdmmc.txt @@ -0,0 +1,35 @@ +* STMicroelectronics STM32 SDMMC controller + +The highspeed MMC host controller on STM32 soc family +provides an interface for MMC, SD and SDIO types of memory cards. + +This file documents differences between the core properties described +by mmc.txt and the properties used by the sdmmc driver. + +Required properties: + - compatible: Should be "st,stm32h7-sdmmc" + - reg: mmc controller base registers + - interrupts: Should contain the interrupt number + - clocks: Should contain phandle for the clock feeding the controller + - resets: Should contain phandle for the reset feeding the controller + +Optional property: +- st,dir-output-high: Allow to select direction polarity of external voltage + transceiver (which manage data and command direction). + if set: Voltage transceiver IOs are driven as output when direction signals are high, + else: Voltage transceiver IOs are driven as output when direction signals are low. +- st,neg-edge: generate data & command on sdmmc clock falling edge +- st,use-ckin: use sdmmc_ckin pin from an external driver to sample + the receive data (example: with voltage switch transceiver). + +Example: + sdmmc1: mmc@52007000 { + compatible = "st,stm32h7-sdmmc"; + reg = <0x52007000 0x1000>; + interrupts = <49>; + clocks = <&rcc SDMMC1_CK>; + resets = <&rcc SDMMC1_R>; + bus-width = <4>; + cap-sd-highspeed; + cap-mmc-highspeed; + }; -- 2.7.4
