linux-kernel - Re: [RESEND v17 3/7] soc: mediatek: add mtk-mmsys support for mt8195 vdosys0

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Message-ID: <429d177cf655c82fbe37e93b3cb452bd08ab3b5e.camel@mediatek.com>
Date:   Fri, 8 Apr 2022 09:42:10 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     David Airlie <airlied@...ux.ie>, <singo.chang@...iatek.com>,
        "Alexandre Torgue" <alexandre.torgue@...s.st.com>,
        <postmaster@...r.kernel.org>,
        "Fabien Parent" <fparent@...libre.com>,
        John 'Warthog9' Hawley <warthog9@...lescrag.net>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <roy-cw.yeh@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        <devicetree@...r.kernel.org>, Daniel Vetter <daniel@...ll.ch>,
        <nancy.lin@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
        <hsinyi@...omium.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <moudy.ho@...iatek.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [RESEND v17 3/7] soc: mediatek: add mtk-mmsys support for
 mt8195 vdosys0

Hi CK,

Thanks for the reviews.

On Thu, 2022-04-07 at 13:58 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Thu, 2022-04-07 at 11:04 +0800, jason-jh.lin wrote:
> > 1. Add mt8195 mmsys compatible for vdosys0.
> > 2. Add mt8195 routing table settings and fix build fail.
> > 3. Add clock name, clock driver name and routing table into the
> > driver data
> >    of mt8195 vdosys0.
> > 4. Add get match data by clock name function and clock platform
> > labels
> >    to identify which mmsys node is corresponding to vdosys0.
> > 
> > Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> > 
> 
> [snip]
> 
> >  
> > +static const struct mtk_mmsys_driver_data
> > mt8195_vdosys0_driver_data
> > = {
> > +	.clk_name = "cfg_vdo0",
> > +	.clk_driver = "clk-mt8195-vdo0",
> > +	.routes = mmsys_mt8195_routing_table,
> > +	.num_routes = ARRAY_SIZE(mmsys_mt8195_routing_table),
> > +};
> > +
> > 
> 
> [snip]
> 
> >  
> > +static int mtk_mmsys_get_match_data_by_clk_name(const struct
> > mtk_mmsys_driver_data **data,
> > +						struct device *dev)
> > +{
> > +	int i;
> > +	struct clk *clk;
> > +	const char *clk_name;
> > +	const struct of_device_id *of_id =
> > of_match_node(mtk_clk_platform_labels,
> > +							 dev->of_node);
> > +	const struct mtk_mmsys_driver_data *drvdata[] = {
> > +		&mt8195_vdosys0_driver_data,
> > +	};
> > +
> > +	if (!of_id || !of_id->data) {
> > +		dev_err(dev, "Can't find match clk platform labels\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	clk = devm_clk_get(dev, NULL);
> > +	if (IS_ERR(clk)) {
> > +		dev_err(dev, "failed to get mmsys clk\n");
> > +		return PTR_ERR(clk);
> > +	}
> > +
> > +	clk_name = __clk_get_name(clk);
> > +	if (!clk_name) {
> > +		dev_err(dev, "invalid mmsys clk name\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	for (i = 0; i < ARRAY_SIZE(drvdata); i++)
> > +		if (strncmp(drvdata[i]->clk_name, clk_name,
> > strlen(clk_name)) == 0 &&
> 
> Why not
> 
> strcmp(drvdata[i]->clk_name, clk_name) == 0
> 
> Regards,
> CK
> 

I would like to block strings without '\0', but it doesn't seem
necessary. So I will change to strcmp at the next version.

Regards,
Jason-JH.Lin

> > +		    strncmp(drvdata[i]->clk_driver, of_id->data,
> > strlen(of_id->data)) == 0) {
> > +			*data = drvdata[i];
> > +			return 0;
> > +		}
> > +
> > +	return -EINVAL;
> > +}
> > +
> >  
> 
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> 
https://urldefense.com/v3/__http://lists.infradead.org/mailman/listinfo/linux-mediatek__;!!CTRNKA9wMg0ARbw!0MJsfiFOYUann5GooGDcIv4Lgm1FaCXDl8dDFCwiONgD0zJn0PQwJuV05-tZNZwVBxVS$
>  
-- 
Jason-JH Lin <jason-jh.lin@...iatek.com>

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