linux-kernel - Re: [PATCH 1/2] dt-bindings: sdhci-of-at91: add the microchip,sdcal-inverted property

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Date:   Fri, 18 Oct 2019 12:58:10 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/2] dt-bindings: sdhci-of-at91: add the
 microchip,sdcal-inverted property

On Tue, 8 Oct 2019 at 14:34, Nicolas Ferre <nicolas.ferre@...rochip.com> wrote:
>
> Add the specific microchip,sdcal-inverted property to at91 sdhci
> device binding.
> This optional property describes how the SoC SDCAL pin is connected.
> It could be handled at SiP, SoM or board level.
>
> This property read by at91 sdhci driver will allow to put in place a
> software workaround that would reduce power consumption.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  Documentation/devicetree/bindings/mmc/sdhci-atmel.txt | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> index 1b662d7171a0..503c6dbac1b2 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> @@ -9,6 +9,11 @@ Required properties:
>  - clocks:              Phandlers to the clocks.
>  - clock-names:         Must be "hclock", "multclk", "baseclk";
>
> +Optional properties:
> +- microchip,sdcal-inverted: when present, polarity on the SDCAL SoC pin is
> +  inverted. The default polarity for this signal is described in the datasheet.
> +  For instance on SAMA5D2, the pin is usually tied to the GND with a resistor
> +  and a capacitor (see "SDMMC I/O Calibration" chapter).
>
>  Example:
>
> --
> 2.17.1
>