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authorWolfram Sang <wsa+renesas@sang-engineering.com>2017-10-15 14:46:13 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2017-10-30 11:50:38 +0100
commitf7834cbd907abb5d4d84f85dba5a7321e5a37b83 (patch)
treee0e0f1ec57e502a39ed7bfe929d00d51e4acf31a /Documentation
parent2d87ddd7b63e276a2e0a11788fce9e91c4d23a86 (diff)
dt-bindings: mmc: describe new eMMC binding for fixed driver type
Some boards may have to use a certain driver type (or drive strength) to achieve stable eMMC communication. Describe a binding to set this up via DT. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/mmc/mmc.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index b32ade645ad9..94a90b49a692 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -53,6 +53,9 @@ Optional properties:
- no-sdio: controller is limited to send sdio cmd during initialization
- no-sd: controller is limited to send sd cmd during initialization
- no-mmc: controller is limited to send mmc cmd during initialization
+- fixed-emmc-driver-type: for non-removable eMMC, enforce this driver type.
+ The value <n> is the driver type as specified in the eMMC specification
+ (table 206 in spec version 5.1).
*NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line
polarity properties, we have to fix the meaning of the "normal" and "inverted"