From 9d11d12a16d12caae7f9418322485392a5583423 Mon Sep 17 00:00:00 2001 From: Mateusz Kulikowski Date: Thu, 31 Mar 2016 23:12:16 +0200 Subject: mmc: Add support for Qualcomm SDHCI controller Add support for SD/eMMC controller present on some Qualcomm Snapdragon devices. This controller implements SDHCI 2.0 interface but requires vendor-specific initialization. Driver works in PIO mode as ADMA is not supported by U-Boot (yet). Signed-off-by: Mateusz Kulikowski Reviewed-by: Simon Glass Tested-by: Simon Glass --- doc/device-tree-bindings/mmc/msm_sdhci.txt | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 doc/device-tree-bindings/mmc/msm_sdhci.txt (limited to 'doc') diff --git a/doc/device-tree-bindings/mmc/msm_sdhci.txt b/doc/device-tree-bindings/mmc/msm_sdhci.txt new file mode 100644 index 00000000000..08a290c6693 --- /dev/null +++ b/doc/device-tree-bindings/mmc/msm_sdhci.txt @@ -0,0 +1,25 @@ +Qualcomm Snapdragon SDHCI controller + +Required properties: +- compatible : "qcom,sdhci-msm-v4" +- reg: Base address and length of registers: + - Host controller registers (SDHCI) + - SD Core registers +- clock: interface clock (must accept SD bus clock as a frequency) + +Optional properties: +- index: If there is more than one controller - controller index (required + by generic SDHCI code). +- bus_width: Width of SD/eMMC bus (default 4) +- clock-frequency: Frequency of SD/eMMC bus (default 400 kHz) + +Example: + +sdhci@07864000 { + compatible = "qcom,sdhci-msm-v4"; + reg = <0x7864900 0x11c 0x7864000 0x800>; + index = <0x1>; + bus-width = <0x4>; + clock = <&clkc 1>; + clock-frequency = <200000000>; +}; -- cgit v1.2.3