linux-kernel - Re: [PATCH 09/11] drm/rockchip: vop2: Add support for rk3588

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Date:   Thu, 16 Nov 2023 14:47:57 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Andy Yan <andy.yan@...k-chips.com>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>, Andy Yan <andyshrk@....com>,
        heiko@...ech.de, hjc@...k-chips.com,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, kever.yang@...k-chips.com,
        chris.obbard@...labora.com
Subject: Re: [PATCH 09/11] drm/rockchip: vop2: Add support for rk3588

Hi,

On Thu, Nov 16, 2023 at 06:39:40PM +0800, Andy Yan wrote:
> > >   	vop2->sys_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
> > This already lacks an error check, shame on me...
> > 
> > > +	vop2->vop_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,vop-grf");
> > > +	vop2->vo1_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,vo1-grf");
> > > +	vop2->sys_pmu = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,pmu");
> > ... but please don't duplicate that.
> 
> It a little difficult to find a proper way to do the check, as not every soc need all these phandles.
> 
> Do i need check it per soc?

I suggest adding a u32 flags to struct vop2_data and then have
something like this:

if (vop2_data->flags & VOP2_HAS_VOP_GRF) {
    vop2->vop_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,vop-grf");
    if (IS_ERR(vop2->vop_grf))
        return dev_err_probe(dev, PTR_ERR(vop2->vop_grf) "cannot get vop-grf");
}

if (vop2_data->flags & VOP2_HAS_VO1_GRF) {
    vop2->vo1_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,vo1-grf");
    if (IS_ERR(vop2->vo1_grf))
        return dev_err_probe(dev, PTR_ERR(vop2->vo1_grf) "cannot get vo1-grf");
}

...

Greetings,

-- Sebastian

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