linux-kernel - [PATCH V2 1/5] dt-bindings: mmc: document the stm32 sdmmc bindings

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Message-ID: <1519832844-28068-2-git-send-email-ludovic.Barre@st.com>
Date:   Wed, 28 Feb 2018 16:47:20 +0100
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V2 1/5] dt-bindings: mmc: document the stm32 sdmmc bindings

From: Ludovic Barre <ludovic.barre@...com>

Document the binding for stm32 sdmmc controller.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 .../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@...07000 {
+		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