linux-kernel - Re: [PATCH v5 6/13] mmc: sunxi: Add EMMC (MMC2) controller compatible

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Date:   Mon, 30 Jan 2017 11:06:05 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v5 6/13] mmc: sunxi: Add EMMC (MMC2) controller compatible

On 27 January 2017 at 22:38, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> The MMC2 controller on the A64 is kind of a special beast.
>
> While the general controller design is the same than the other MMC
> controllers in the SoC, it also has a bunch of features and changes that
> prevent it to be driven in the same way.
>
> It has for example a different bus width limit, a different maximum
> frequency, and, for some reason, the maximum buffer size of a DMA
> descriptor.
>
> Add a new compatible specifically for this controller.
>
> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Tested-by: Florian Vaussard <florian.vaussard@...g-vd.ch>
> ---
>  drivers/mmc/host/sunxi-mmc.c | 8 ++++++++
>  1 file changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index 6bbe61397b7c..f0f6922bca8a 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -5,6 +5,7 @@
>   * (C) Copyright 2013-2014 O2S GmbH <www.o2s.ch>
>   * (C) Copyright 2013-2014 David Lanzend�rfer <david.lanzendoerfer@....ch>
>   * (C) Copyright 2013-2014 Hans de Goede <hdegoede@...hat.com>
> + * (C) Copyright 2017 Sootech SA
>   *
>   * This program is free software; you can redistribute it and/or
>   * modify it under the terms of the GNU General Public License as
> @@ -1096,12 +1097,19 @@ static const struct sunxi_mmc_cfg sun50i_a64_cfg = {
>         .needs_new_timings = true,
>  };
>
> +static const struct sunxi_mmc_cfg sun50i_a64_emmc_cfg = {
> +       .idma_des_size_bits = 13,
> +       .clk_delays = NULL,
> +       .can_calibrate = true,
> +};
> +
>  static const struct of_device_id sunxi_mmc_of_match[] = {
>         { .compatible = "allwinner,sun4i-a10-mmc", .data = &sun4i_a10_cfg },
>         { .compatible = "allwinner,sun5i-a13-mmc", .data = &sun5i_a13_cfg },
>         { .compatible = "allwinner,sun7i-a20-mmc", .data = &sun7i_a20_cfg },
>         { .compatible = "allwinner,sun9i-a80-mmc", .data = &sun9i_a80_cfg },
>         { .compatible = "allwinner,sun50i-a64-mmc", .data = &sun50i_a64_cfg },
> +       { .compatible = "allwinner,sun50i-a64-emmc", .data = &sun50i_a64_emmc_cfg },

This should be documented in the DTS docs for sunxi as well. I expect
you to send a patch on top to take care of that.

Kind regards
Uffe