linux-kernel - RE: [PATCH v4 2/2] media: aspeed: Allow to capture from SoC display (GFX)

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Message-ID:
 <TYZPR06MB6568197D19B5855A014A0ECBF1812@TYZPR06MB6568.apcprd06.prod.outlook.com>
Date: Fri, 16 Aug 2024 02:31:43 +0000
From: Jammy Huang <jammy_huang@...eedtech.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, "eajames@...ux.ibm.com"
	<eajames@...ux.ibm.com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	"joel@....id.au" <joel@....id.au>, "andrew@...id.au" <andrew@...id.au>,
	"pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>
CC: "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 2/2] media: aspeed: Allow to capture from SoC display
 (GFX)

Hi Krzysztof,

On 2024/8/14 下午 02:09, Krzysztof Kozlowski wrote:
>
> On 14/08/2024 02:54, Jammy Huang wrote:
> > +/*
> > + * Get regmap without checking res, such as clk/reset, that could
> > +lead to
> > + * conflict.
> > + */
> > +static struct regmap *aspeed_regmap_lookup(struct device_node *np,
> > +const char *property) {
> > +   struct device_node *syscon_np __free(device_node) =
> of_parse_phandle(np, property, 0);
> > +   struct regmap *regmap;
>
> Drop. The point of using __free was to make this very simple.
To be simpler, it will looks like this, right.

+       struct device_node *syscon_np __free(device_node) = of_parse_phandle(np, property, 0);
+
+       if (!syscon_np)
+               return ERR_PTR(-ENODEV);
+       return device_node_to_regmap(syscon_np);
>
> > +
> > +   if (!syscon_np)
> > +           return ERR_PTR(-ENODEV);
> > +
> > +   regmap = device_node_to_regmap(syscon_np);
> > +
> > +   return regmap;
> > +}
> > +
> >  static int aspeed_video_init(struct aspeed_video *video)  {
> >     int irq;
> >     int rc;
> >     struct device *dev = video->dev;
> >
> > +   video->scu = aspeed_regmap_lookup(dev->of_node, "aspeed,scu");
> > +   video->gfx = aspeed_regmap_lookup(dev->of_node, "aspeed,gfx");
>
> Still undocumented. Respond to previous comment and confirm that you
> understood it.
Sorry for misunderstanding. I will add document,
Documentation/devicetree/bindings/arm/aspeed/aspeed,video.yaml, later.

>
>
> Best regards,
> Krzysztof

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