From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ludovic Barre Subject: [PATCH 1/5] dt-bindings: mmc: document the stm32 sdmmc bindings Date: Thu, 15 Feb 2018 14:34:53 +0100 Message-ID: <1518701697-14242-2-git-send-email-ludovic.Barre@st.com> References: <1518701697-14242-1-git-send-email-ludovic.Barre@st.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1518701697-14242-1-git-send-email-ludovic.Barre@st.com> Sender: linux-kernel-owner@vger.kernel.org To: Ulf Hansson , Rob Herring Cc: Maxime Coquelin , Alexandre Torgue , Gerald Baeza , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mmc@vger.kernel.org, Ludovic Barre List-Id: devicetree@vger.kernel.org From: Ludovic Barre Document the binding for stm32 sdmmc controller. Signed-off-by: Ludovic Barre --- .../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..52eb1f8 --- /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,dirpol: 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,negedge: generate data & command on sdmmc clock falling edge +- st,pin-ckin: use sdmmc_ckin pin from an external driver to sample + the receive data (example: with voltage switch transceiver). + +Example: + sdmmc1: sdmmc@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