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Commit f7834cbd authored by Wolfram Sang's avatar Wolfram Sang Committed by Ulf Hansson
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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: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 2d87ddd7

Documentation/devicetree/bindings/mmc/mmc.txt

+3 −0
Original line number Diff line number Diff line
@@ -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"