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authorAapo Vienamo <avienamo@nvidia.com>2018-08-10 21:13:58 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2018-10-08 12:40:43 +0300
commit3ecea59d27f87b0fe9ab09b0ce8262f5355ec243 (patch)
tree22f7ec40b4f69c6711ee5da1c792f115694717b0
parent2ad50051575c6556822c69a9053142462f2e8375 (diff)
downloadlinux-3ecea59d27f87b0fe9ab09b0ce8262f5355ec243.tar.xz
dt-bindings: mmc: Add DQS trim value to Tegra SDHCI
Document HS400 DQS trim value device tree property. Signed-off-by: Aapo Vienamo <avienamo@nvidia.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index edecf97231b9..32b4b4e41923 100644
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -71,6 +71,7 @@ Optional properties for Tegra210 and Tegra186:
trimmer value for non-tunable modes.
- nvidia,default-trim : Specify the default outbound clock trimmer
value.
+- nvidia,dqs-trim : Specify DQS trim value for HS400 timing
Notes on the pad calibration pull up and pulldown offset values:
- The property values are drive codes which are programmed into the
@@ -87,6 +88,9 @@ Optional properties for Tegra210 and Tegra186:
- The values are programmed to the Vendor Clock Control Register.
Please refer to the reference manual of the SoC for correct
values.
+ - The DQS trim values are only used on controllers which support
+ HS400 timing. Only SDMMC4 on Tegra210 and Tegra 186 supports
+ HS400.
Example:
sdhci@700b0000 {