linux-kernel - Re: [PATCH v1 11/17] drm/mediatek: hdmi: add mt8195 support

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Message-ID: <c74b4ab7-e307-482b-c4fc-0a7a1e39d6d1@linaro.org>
Date:   Thu, 22 Sep 2022 09:24:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Guillaume Ranquet <granquet@...libre.com>,
        Vinod Koul <vkoul@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>, Jitao shi <jitao.shi@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Pablo Sun <pablo.sun@...iatek.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mattijs Korpershoek <mkorpershoek@...libre.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 11/17] drm/mediatek: hdmi: add mt8195 support

On 19/09/2022 18:56, Guillaume Ranquet wrote:
> Adds hdmi and hdmi-ddc support for mt8195.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>


> +static int mtk_hdmi_ddc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct mtk_hdmi_ddc *ddc;
> +	int ret;
> +
> +	ddc = devm_kzalloc(dev, sizeof(struct mtk_hdmi_ddc), GFP_KERNEL);
> +	if (!ddc)
> +		return -ENOMEM;
> +
> +	ddc->regs = syscon_regmap_lookup_by_compatible("mediatek,mt8195-hdmi");

That's not how you get regmaps. If you the driver grows, are you going
to grow the list to e.g. 10 syscon_regmap_lookup_by_compatible() calls?
This has to be by phandle.

Best regards,
Krzysztof