linux-kernel - Re: [PATCH V2 26/27] mmc: mmci: add DT bindings for STM32 sdmmc

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Message-ID: <CAPDyKFoiZMnYqtp_FofYEV=xKD+Azb2qKf=R=LdRsE+doxqW+A@mail.gmail.com>
Date:   Mon, 1 Oct 2018 11:30:58 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ludovic Barre <ludovic.Barre@...com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Gerald Baeza <gerald.baeza@...com>,
        Loic Pallardy <loic.pallardy@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 26/27] mmc: mmci: add DT bindings for STM32 sdmmc

On 21 September 2018 at 11:46, Ludovic Barre <ludovic.Barre@...com> wrote:
> From: Ludovic Barre <ludovic.barre@...com>
>
> STM32 sdmmc variant has support to:
> -Indicate signal directions (only one property
> for d0dir, d123dir, cmd_dir)
> -Select command and data phase relation.
> -Select "clock in" from an external driver.
>
> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
> ---
> change v3:
> -remove space at end of "st,use-ckin "
>
>  Documentation/devicetree/bindings/mmc/mmci.txt | 9 +++++++++

Please split this. DT doc changes should be separate patches.

>  drivers/mmc/host/mmci.c                        | 6 ++++++
>  drivers/mmc/host/mmci.h                        | 1 +
>  3 files changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmci.txt b/Documentation/devicetree/bindings/mmc/mmci.txt
> index e952707..d678933 100644
> --- a/Documentation/devicetree/bindings/mmc/mmci.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmci.txt
> @@ -19,6 +19,7 @@ Optional properties:
>                             the ID provided by the HW
>  - vqmmc-supply           : phandle to the regulator device tree node, mentioned
>                             as the VCCQ/VDD_IO supply in the eMMC/SD specs.
> +specific for ux500 variant:
>  - st,sig-dir-dat0        : bus signal direction pin used for DAT[0].
>  - st,sig-dir-dat2        : bus signal direction pin used for DAT[2].
>  - st,sig-dir-dat31       : bus signal direction pin used for DAT[3] and DAT[1].
> @@ -26,6 +27,14 @@ Optional properties:
>  - st,sig-dir-cmd         : cmd signal direction pin used for CMD.
>  - st,sig-pin-fbclk       : feedback clock signal pin used.
>
> +specific for sdmmc variant:
> +- st,sig-dir             : signal direction polarity used for cmd, dat0 dat123.
> +- st,neg-edge            : data & command phase relation, generated on
> +                           sd clock falling edge.
> +- st,use-ckin            : use ckin pin from an external driver to sample
> +                           the receive data (example: with voltage
> +                          switch transceiver).

[...]

Kind regards
Uffe