linux-kernel - Re: [RFC PATCH 02/11] drm: sun4i: add support for H3 mixers

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Date:   Fri, 19 May 2017 19:47:29 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.xyz>
Subject: Re: [RFC PATCH 02/11] drm: sun4i: add support for H3 mixers

On Thu, May 18, 2017 at 12:43:45AM +0800, Icenowy Zheng wrote:
> From: Icenowy Zheng <icenowy@...c.xyz>
> 
> Allwinner H3 SoC has two mixers, one has 1 VI channel and 3 UI channels,
> and the other has 1 VI and 1 UI.
> 
> Add support for these two variants.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> ---
>  drivers/gpu/drm/sun4i/sun8i_mixer.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> index cb193c5f1686..d658a3a8159a 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> @@ -390,11 +390,29 @@ static const struct sun8i_mixer_cfg sun8i_v3s_mixer_cfg = {
>  	.ui_num = 1,
>  };
>  
> +static const struct sun8i_mixer_cfg sun8i_h3_mixer0_cfg = {
> +	.vi_num = 1,
> +	.ui_num = 3,
> +};
> +
> +static const struct sun8i_mixer_cfg sun8i_h3_mixer1_cfg = {
> +	.vi_num = 1,
> +	.ui_num = 1,
> +};
> +
>  static const struct of_device_id sun8i_mixer_of_table[] = {
>  	{
>  		.compatible = "allwinner,sun8i-v3s-de2-mixer",
>  		.data = &sun8i_v3s_mixer_cfg,
>  	},
> +	{
> +		.compatible = "allwinner,sun8i-h3-de2-mixer0",
> +		.data = &sun8i_h3_mixer0_cfg
> +	},
> +	{
> +		.compatible = "allwinner,sun8i-h3-de2-mixer1",
> +		.data = &sun8i_h3_mixer1_cfg
> +	},

So the only difference between the two is the number of ui planes?

Why not create a property to give the number then, instead of a
compatible?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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