linux-kernel - Re: [PATCH v5 7/9] media: adv748x: only activate DAI if it is described in device tree

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Date:   Thu, 18 Jun 2020 17:17:04 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Alex Riesen <alexander.riesen@...itec.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        devel@...verdev.osuosl.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v5 7/9] media: adv748x: only activate DAI if it is
 described in device tree

Hi Alex,

On 02/04/2020 19:34, Alex Riesen wrote:
> To avoid setting it up even if the hardware is not actually connected
> to anything physically.
> 
> Besides, the bindings explicitly notes that port definitions are
> "optional if they are not connected to anything at the hardware level".
> 
> Signed-off-by: Alexander Riesen <alexander.riesen@...itec.com>
> ---
>  drivers/media/i2c/adv748x/adv748x-dai.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
> index 185f78023e91..f9cc47fa9ad1 100644
> --- a/drivers/media/i2c/adv748x/adv748x-dai.c
> +++ b/drivers/media/i2c/adv748x/adv748x-dai.c
> @@ -216,6 +216,11 @@ int adv748x_dai_init(struct adv748x_dai *dai)
>  	int ret;
>  	struct adv748x_state *state = adv748x_dai_to_state(dai);
>  
> +	if (!state->endpoints[ADV748X_PORT_I2S]) {
> +		adv_info(state, "no I2S port, DAI disabled\n");
> +		ret = 0;
> +		goto fail;

How about just 'return 0'?

> +	}

And a blank line here ...

Otherwise,

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

This could also be folded into 5/9 too I guess?, though it is easier to
review the sequential additions, rather than the one-big-feature
addition ;-)


>  	dai->mclk_name = kasprintf(GFP_KERNEL, "%s.%s-i2s-mclk",
>  				   state->dev->driver->name,
>  				   dev_name(state->dev));
> 

-- 
Regards
--
Kieran