dt-bindings: mmc: Add Tegra SDHCI sampling trimmer values
Document the Tegra SDHCI inbound and outbound sampling trimmer values. 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>
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@ -67,6 +67,10 @@ Optional properties for Tegra210 and Tegra186:
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- nvidia,pad-autocal-pull-up-offset-hs400,
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- nvidia,pad-autocal-pull-up-offset-hs400,
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nvidia,pad-autocal-pull-down-offset-hs400 : Specify drive strength
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nvidia,pad-autocal-pull-down-offset-hs400 : Specify drive strength
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calibration offsets for HS400 mode.
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calibration offsets for HS400 mode.
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- nvidia,default-tap : Specify the default inbound sampling clock
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trimmer value for non-tunable modes.
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- nvidia,default-trim : Specify the default outbound clock trimmer
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value.
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Notes on the pad calibration pull up and pulldown offset values:
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Notes on the pad calibration pull up and pulldown offset values:
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- The property values are drive codes which are programmed into the
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- The property values are drive codes which are programmed into the
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@ -77,6 +81,13 @@ Optional properties for Tegra210 and Tegra186:
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- The SDR104 and HS400 timing specific values are used in
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- The SDR104 and HS400 timing specific values are used in
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corresponding modes if specified.
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corresponding modes if specified.
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Notes on tap and trim values:
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- The values are used for compensating trace length differences
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by adjusting the sampling point.
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- The values are programmed to the Vendor Clock Control Register.
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Please refer to the reference manual of the SoC for correct
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values.
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Example:
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Example:
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sdhci@700b0000 {
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sdhci@700b0000 {
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compatible = "nvidia,tegra210-sdhci", "nvidia,tegra124-sdhci";
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compatible = "nvidia,tegra210-sdhci", "nvidia,tegra124-sdhci";
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