linux-kernel - [PATCH 1/8] dt-bindings: mmc: Add DQS trim value to Tegra SDHCI

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Message-ID: <1533650404-18125-2-git-send-email-avienamo@nvidia.com>
Date:   Tue, 7 Aug 2018 16:59:57 +0300
From:   Aapo Vienamo <avienamo@...dia.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>
CC:     <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Aapo Vienamo <avienamo@...dia.com>
Subject: [PATCH 1/8] dt-bindings: mmc: Add DQS trim value to Tegra SDHCI

Document HS400 DQS trim value device tree property.

Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
---
 Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 3c7960a..7d294f3 100644
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -72,6 +72,7 @@ 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
@@ -88,6 +89,8 @@ 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.
 
 Example:
 sdhci@...b0000 {
-- 
2.7.4