Document HS400 DQS trim value device tree property.
Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
---
Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index edecf97..32b4b4e 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 {
--
2.7.4
