linux-kernel - Re: [PATCH v3 03/38] dt-bindings: Add Tegra SDHCI pad pdpu offset bindings

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Date:   Fri, 31 Aug 2018 15:15:45 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Aapo Vienamo <avienamo@...dia.com>
Cc:     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>,
        Stefan Agner <stefan@...er.ch>,
        DTML <devicetree@...r.kernel.org>, linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v3 03/38] dt-bindings: Add Tegra SDHCI pad pdpu offset bindings

On 30 August 2018 at 17:06, Aapo Vienamo <avienamo@...dia.com> 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@...dia.com>
> Acked-by: Thierry Reding <treding@...dia.com>

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@...b0000 {
> @@ -58,5 +89,9 @@ sdhci@...b0000 {
>         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
>