linux-kernel - Re: [PATCH 03/40] dt-bindings: Add Tegra SDHCI pad pdpu offset bindings

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Date:   Thu, 9 Aug 2018 14:18:18 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Aapo Vienamo <avienamo@...dia.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Stefan Agner <stefan@...er.ch>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org
Subject: Re: [PATCH 03/40] dt-bindings: Add Tegra SDHCI pad pdpu offset
 bindings

On Wed, Aug 01, 2018 at 07:31:53PM +0300, Aapo Vienamo 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>
> ---
>  .../bindings/mmc/nvidia,tegra20-sdhci.txt          | 36 ++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> index 90c214d..2e973b5 100644
> --- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
> @@ -24,6 +24,7 @@ Required properties:
>  Optional properties:
>  - power-gpios : Specify GPIOs for power control
>  
> +Optional properties for Tegra210 and Tegra186:

This looks like a stray addition.

>  Example:
>  
>  sdhci@...00200 {
> @@ -45,6 +46,37 @@ 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.

There's no mention here about how many values each of these properties
needs. I guess given that the property names are singular it implies a
single value.

Thierry

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