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

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Date:   Fri, 17 Nov 2023 15:06:35 +0800
From:   Andy Yan <andy.yan@...k-chips.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.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 Sebastian:

On 11/16/23 21:47, Sebastian Reichel wrote:
> 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");
> }
>
> ...


I can do it like this if Sascha is also happy with it.

>
> Greetings,
>
> -- Sebastian