On 30 August 2018 at 17:06, Aapo Vienamo <avienamo@xxxxxxxxxx> wrote:
> Add bindings documentation for pad pull up and pull down offset values to be
> programmed before executing automatic pad drive strength calibration.
>
> Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
> Acked-by: Thierry Reding <treding@xxxxxxxxxx>
Applied for next, thanks!
I noted that Rob added his tag for the earlier version, so I am
re-adding when applying.
Kind regards
Uffe
> ---
> .../bindings/mmc/nvidia,tegra20-sdhci.txt | 35 +++++++++++++++++++
> 1 file changed, 35 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> index 90c214dbfb16..9713e052f736 100644
> --- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> @@ -45,6 +45,37 @@ Optional properties for Tegra210 and Tegra186:
> for controllers supporting multiple voltage levels. The order of names
> should correspond to the pin configuration states in pinctrl-0 and
> pinctrl-1.
> +- nvidia,only-1-8-v : The presence of this property indicates that the
> + controller operates at a 1.8 V fixed I/O voltage.
> +- nvidia,pad-autocal-pull-up-offset-3v3,
> + nvidia,pad-autocal-pull-down-offset-3v3 : Specify drive strength
> + calibration offsets for 3.3 V signaling modes.
> +- nvidia,pad-autocal-pull-up-offset-1v8,
> + nvidia,pad-autocal-pull-down-offset-1v8 : Specify drive strength
> + calibration offsets for 1.8 V signaling modes.
> +- nvidia,pad-autocal-pull-up-offset-3v3-timeout,
> + nvidia,pad-autocal-pull-down-offset-3v3-timeout : Specify drive
> + strength used as a fallback in case the automatic calibration times
> + out on a 3.3 V signaling mode.
> +- nvidia,pad-autocal-pull-up-offset-1v8-timeout,
> + nvidia,pad-autocal-pull-down-offset-1v8-timeout : Specify drive
> + strength used as a fallback in case the automatic calibration times
> + out on a 1.8 V signaling mode.
> +- nvidia,pad-autocal-pull-up-offset-sdr104,
> + nvidia,pad-autocal-pull-down-offset-sdr104 : Specify drive strength
> + calibration offsets for SDR104 mode.
> +- nvidia,pad-autocal-pull-up-offset-hs400,
> + nvidia,pad-autocal-pull-down-offset-hs400 : Specify drive strength
> + calibration offsets for HS400 mode.
> +
> + Notes on the pad calibration pull up and pulldown offset values:
> + - The property values are drive codes which are programmed into the
> + PD_OFFSET and PU_OFFSET sections of the
> + SDHCI_TEGRA_AUTO_CAL_CONFIG register.
> + - A higher value corresponds to higher drive strength. Please refer
> + to the reference manual of the SoC for correct values.
> + - The SDR104 and HS400 timing specific values are used in
> + corresponding modes if specified.
>
> Example:
> sdhci@700b0000 {
> @@ -58,5 +89,9 @@ sdhci@700b0000 {
> pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
> pinctrl-0 = <&sdmmc1_3v3>;
> pinctrl-1 = <&sdmmc1_1v8>;
> + nvidia,pad-autocal-pull-up-offset-3v3 = <0x00>;
> + nvidia,pad-autocal-pull-down-offset-3v3 = <0x7d>;
> + nvidia,pad-autocal-pull-up-offset-1v8 = <0x7b>;
> + nvidia,pad-autocal-pull-down-offset-1v8 = <0x7b>;
> status = "disabled";
> };
> --
> 2.18.0
>
