Re: [PATCH v4] drm: bridge: add DesignWare HDMI I2S audio support

[Russell King - ARM Linux]

On Tue, Nov 08, 2016 at 01:00:57AM +0000, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
> 
> Current dw-hdmi is supporting sound via AHB bus, but it has
> I2S audio feature too. This patch adds I2S audio support to dw-hdmi.
> This HDMI I2S is supported by using ALSA SoC common HDMI encoder
> driver.
> 
> Tested-by: Jose Abreu <joabreu@xxxxxxxxxxxx>
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
> ---
> v3 -> v4
> 
>  - use IS_ERR() instead of IS_ERR_OR_NULL() on probe()

Thanks, that looks good now.

> @@ -11,4 +11,11 @@ struct dw_hdmi_audio_data {
>  	u8 *eld;
>  };
>  
> +struct dw_hdmi_i2s_audio_data {
> +	struct dw_hdmi *hdmi;
> +
> +	void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
> +	u8 (*read)(struct dw_hdmi *hdmi, int offset);
> +};

Another slight concern here is why we need this separate data for i2s -
maybe adding the write/read ops to struct dw_hdmi_audio_data would be
a better thing to do, which would then allow the AHB audio to drop
the .base argument in the future.

I'm not that bothered about this though.  So...

Acked-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>

Thanks.

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