linux-kernel - Re: [PATCH v2 1/3] dt-binding: mmc: sunxi: add H6 compatible (with A64 fallback)

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Date:   Thu, 26 Jul 2018 09:14:26 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] dt-binding: mmc: sunxi: add H6 compatible (with
 A64 fallback)

在 2018-07-19四的 12:28 +0800，Icenowy Zheng写道：
> The MMC controllers on H6 is similar to the ones on A64, but with
> some
> new features.
> 
> Add compatible strings for them (with the A64 compatible strings as
> fallback, in order to make them to work with A64 drivers).
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
> Changes in v2:
> - Add A64 fallback.
> 
>  Documentation/devicetree/bindings/mmc/sunxi-mmc.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
> b/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
> index 132e0007d7d6..e9cb3ec5e502 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-a64-emmc"
> +   * "allwinner,sun50i-h6-mmc", "allwinner.sun50i-a64-mmc"

BTW it seems that the driver performs quite bad on H6 when dealing it
as an A64.

I get 1.5MB/s on a card, although the card can reach 20MB/s read speed
(testing on BSP).

>   - reg : mmc controller base registers
>   - clocks : a list with 4 phandle + clock specifier pairs
>   - clock-names : must contain "ahb", "mmc", "output" and "sample"