linux-kernel - Re: [linux-sunxi] [PATCH 1/3] mmc: sunxi: add support for the MMC controller on H6

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Date:   Thu, 26 Apr 2018 17:45:24 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     icenowy@...c.io, Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] [PATCH 1/3] mmc: sunxi: add support for the MMC
 controller on H6

Hi,

On 26/04/18 15:07, Icenowy Zheng wrote:
> The new Allwinner H6 SoC have 3 MMC controllers. The first and second
> ones are similar to the ones on A64, but the third one adds EMCE
> (Embedded Crypto Engine) support which does hardware transparent crypto
> on the eMMC.
> 
> As we still do not have support for EMCE, and the support of it is
> disabled by defualt, we just duplicate the A64 mmc configurations and
> change the compatible string.

So if the A64 MMC part is compatible, we should express it like this:

> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  Documentation/devicetree/bindings/mmc/sunxi-mmc.txt |  2 ++
>  drivers/mmc/host/sunxi-mmc.c                        | 16 ++++++++++++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt b/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
> index 132e0007d7d6..e6aa5c7a5e12 100644
> --- a/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
> @@ -16,6 +16,8 @@ Required properties:
>     * "allwinner,sun9i-a80-mmc"
>     * "allwinner,sun50i-a64-emmc"
>     * "allwinner,sun50i-a64-mmc"
> +   * "allwinner,sun50i-h6-emmc"
> +   * "allwinner,sun50i-h6-mmc"

This should be changed to:

      * "allwinner,sun50i-h6-emmc", "allwinner,sun50i-a64-emmc"
      * "allwinner,sun50i-h6-mmc", "allwinner,sun50i-a64-mmc"

>   - reg : mmc controller base registers
>   - clocks : a list with 4 phandle + clock specifier pairs
>   - clock-names : must contain "ahb", "mmc", "output" and "sample"
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index 97c6b79b7d6f..05e2b5fd7aa4 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -1168,6 +1168,20 @@ static const struct sunxi_mmc_cfg sun50i_a64_emmc_cfg = {
>  	.can_calibrate = true,
>  };
>  
> +static const struct sunxi_mmc_cfg sun50i_h6_cfg = {
> +	.idma_des_size_bits = 16,
> +	.clk_delays = NULL,
> +	.can_calibrate = true,
> +	.mask_data0 = true,
> +	.needs_new_timings = true,
> +};
> +
> +static const struct sunxi_mmc_cfg sun50i_h6_emmc_cfg = {
> +	.idma_des_size_bits = 13,
> +	.clk_delays = NULL,
> +	.can_calibrate = true,
> +};
> +

... and then we don't need those changes ...

>  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 },
> @@ -1176,6 +1190,8 @@ static const struct of_device_id sunxi_mmc_of_match[] = {
>  	{ .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 },
> +	{ .compatible = "allwinner,sun50i-h6-mmc", .data = &sun50i_h6_cfg },
> +	{ .compatible = "allwinner,sun50i-h6-emmc", .data = &sun50i_h6_emmc_cfg },

... and those, at least yet.
Should we ever extend the driver to support the EMCE, we can add them at
this occasion.

So this patch would just add the compatible pairs to the binding doc.

Cheers,
Andre.

>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);
>