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dt-bindings: mmc: Add Cavium SOCs MMC bindings

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Add description of Cavium Octeon and ThunderX SOC device tree bindings.

CC: Ulf Hansson <ulf.hansson@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
CC: devicetree@vger.kernel.org

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jan Glauber 2017-03-30 17:31:23 +02:00 committed by Ulf Hansson
parent 67b8360acc
commit dc5aee3f9f
1 changed files with 57 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/cavium-mmc.txt Normal file
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* Cavium Octeon & ThunderX MMC controller
The highspeed MMC host controller on Caviums SoCs provides an interface
for MMC and SD types of memory cards.
Supported maximum speeds are the ones of the eMMC standard 4.41 as well
as the speed of SD standard 4.0. Only 3.3 Volt is supported.
Required properties:
- compatible : should be one of:
cavium,octeon-6130-mmc
cavium,octeon-7890-mmc
cavium,thunder-8190-mmc
cavium,thunder-8390-mmc
mmc-slot
- reg : mmc controller base registers
- clocks : phandle
Optional properties:
- for cd, bus-width and additional generic mmc parameters
please refer to mmc.txt within this directory
- cavium,cmd-clk-skew : number of coprocessor clocks before sampling command
- cavium,dat-clk-skew : number of coprocessor clocks before sampling data
Deprecated properties:
- spi-max-frequency : use max-frequency instead
- cavium,bus-max-width : use bus-width instead
- power-gpios : use vmmc-supply instead
- cavium,octeon-6130-mmc-slot : use mmc-slot instead
Examples:
mmc_1_4: mmc@1,4 {
compatible = "cavium,thunder-8390-mmc";
reg = <0x0c00 0 0 0 0>; /* DEVFN = 0x0c (1:4) */
#address-cells = <1>;
#size-cells = <0>;
clocks = <&sclk>;
mmc-slot@0 {
compatible = "mmc-slot";
reg = <0>;
vmmc-supply = <&mmc_supply_3v3>;
max-frequency = <42000000>;
bus-width = <4>;
cap-sd-highspeed;
};
mmc-slot@1 {
compatible = "mmc-slot";
reg = <1>;
vmmc-supply = <&mmc_supply_3v3>;
max-frequency = <42000000>;
bus-width = <8>;
cap-mmc-highspeed;
non-removable;
};
};