linux-kernel - Re: [PATCH v5 07/12] drm: renesas: rz-du: mipi_dsi: Make "rst" reset control optional for RZ/V2H(P)

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Message-ID: <20250520142643.GI13321@pendragon.ideasonboard.com>
Date: Tue, 20 May 2025 16:26:43 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Biju Das <biju.das.jz@...renesas.com>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v5 07/12] drm: renesas: rz-du: mipi_dsi: Make "rst" reset
 control optional for RZ/V2H(P)

Hi Prabhakar,

On Mon, May 12, 2025 at 07:23:25PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> In preparation for adding support for the Renesas RZ/V2H(P) SoC, make the
> "rst" reset control optional in the MIPI DSI driver. The RZ/V2H(P) SoC
> does not provide this reset line, and attempting to acquire it using the
> mandatory API causes probe failure.
> 
> Switching to devm_reset_control_get_optional_exclusive() ensures
> compatibility with both SoCs that provide this reset line and those that
> do not, such as RZ/V2H(P).
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

> ---
> v4->v5:
> - New patch
> ---
>  drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> index 00c2bc6e9d6c..5fc607be0c46 100644
> --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> @@ -748,7 +748,7 @@ static int rzg2l_mipi_dsi_probe(struct platform_device *pdev)
>  	if (IS_ERR(dsi->vclk))
>  		return PTR_ERR(dsi->vclk);
>  
> -	dsi->rstc = devm_reset_control_get_exclusive(dsi->dev, "rst");
> +	dsi->rstc = devm_reset_control_get_optional_exclusive(dsi->dev, "rst");
>  	if (IS_ERR(dsi->rstc))
>  		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rstc),
>  				     "failed to get rst\n");

-- 
Regards,

Laurent Pinchart