* [PATCH v2 1/3] dt-bindings: mmc: describe new eMMC binding for fixed driver type
[not found] <20171004173920.15232-1-wsa+renesas@sang-engineering.com>
@ 2017-10-04 17:39 ` Wolfram Sang
0 siblings, 0 replies; only message in thread
From: Wolfram Sang @ 2017-10-04 17:39 UTC (permalink / raw)
To: linux-mmc
Cc: linux-renesas-soc, Simon Horman, Adrian Hunter, Marek Vasut,
Wolfram Sang, devicetree, Rob Herring
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>
Cc: devicetree@vger.kernel.org
---
Changes since RFC v1:
* rebased to mmc/next based on 4.14-rc3
* proper prefix for subject
* added Rob's ack
Documentation/devicetree/bindings/mmc/mmc.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index b32ade645ad97c..94a90b49a6925d 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"
--
2.11.0
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