linux-kernel - Re: [PATCH] clk: mediatek: mt8188: probe vpp with mtk_clk_simple

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Date:   Fri, 27 Oct 2023 07:42:33 +0000
From:   Yu-chang Lee (李禹璋) 
        <Yu-chang.Lee@...iatek.com>
To:     "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "wenst@...omium.org" <wenst@...omium.org>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        Moudy Ho (何宗原) <Moudy.Ho@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH] clk: mediatek: mt8188: probe vpp with
 mtk_clk_simple_probe()

On Thu, 2023-10-26 at 13:45 +0200, AngeloGioacchino Del Regno wrote:
> Il 26/10/23 13:38, yu-chang.lee ha scritto:
> > switch to the common mtk_clk_simple_probe() function for all of the
> > clock drivers that are registering as platform drivers.
> > 
> 
> So VPPSYS0 and VPPSYS1 aren't dependant on MMSYS anymore?
> 
> Like this, it doesn't look like this will ever work fine, so if you
> want
> that to happen, you must provide a good explanation, and then, since
> MT8188
> and MT8195's VPPSYS are practically the same, you should also convert
> MT8195
> to do the same, and make sure that everything works as expected
> before sending
> a commit upstream.
> 
> Please, explain.
> 
> Thanks,
> Angelo
> 
Hi Angelo,

Thanks for your time and timely feedback. I don't find mt8188-vpp1 and
mt8188-vpp0 in mtk-mmsys.c. and thought probed them with
mtk_simple_probe(), refer to your comment on in this patch
"clk:
mediatek: Switch to mtk_clk_simple_probe() where possible", will be a
good idea. On the other hand mt8195 does have dependency on MMSYS, so I
don't think the same change work on mt8195.

Best Regards,
YuChang

> > Signed-off-by: yu-chang.lee <yu-chang.lee@...iatek.com>
> > ---
> >   drivers/clk/mediatek/clk-mt8188-vpp0.c | 14 +++++++++++---
> >   drivers/clk/mediatek/clk-mt8188-vpp1.c | 14 +++++++++++---
> >   2 files changed, 22 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/clk/mediatek/clk-mt8188-vpp0.c
> > b/drivers/clk/mediatek/clk-mt8188-vpp0.c
> > index e7b02b26fefb..18fffa191ee1 100644
> > --- a/drivers/clk/mediatek/clk-mt8188-vpp0.c
> > +++ b/drivers/clk/mediatek/clk-mt8188-vpp0.c
> > @@ -96,6 +96,15 @@ static const struct mtk_clk_desc vpp0_desc = {
> >   	.num_clks = ARRAY_SIZE(vpp0_clks),
> >   };
> >   
> > +static const struct of_device_id of_match_clk_mt8188_vpp0[] = {
> > +	{
> > +		.compatible = "mediatek,mt8188-vppsys0",
> > +		.data = &vpp0_desc,
> > +	}, {
> > +		/* sentinel */
> > +	}
> > +};
> > +
> >   static const struct platform_device_id clk_mt8188_vpp0_id_table[]
> > = {
> >   	{ .name = "clk-mt8188-vpp0", .driver_data =
> > (kernel_ulong_t)&vpp0_desc },
> >   	{ /* sentinel */ }
> > @@ -103,12 +112,11 @@ static const struct platform_device_id
> > clk_mt8188_vpp0_id_table[] = {
> >   MODULE_DEVICE_TABLE(platform, clk_mt8188_vpp0_id_table);
> >   
> >   static struct platform_driver clk_mt8188_vpp0_drv = {
> > -	.probe = mtk_clk_pdev_probe,
> > -	.remove_new = mtk_clk_pdev_remove,
> > +	.probe = mtk_clk_simple_probe,
> >   	.driver = {
> >   		.name = "clk-mt8188-vpp0",
> > +		.of_match_table = of_match_clk_mt8188_vpp0,
> >   	},
> > -	.id_table = clk_mt8188_vpp0_id_table,
> >   };
> >   module_platform_driver(clk_mt8188_vpp0_drv);
> >   MODULE_LICENSE("GPL");
> > diff --git a/drivers/clk/mediatek/clk-mt8188-vpp1.c
> > b/drivers/clk/mediatek/clk-mt8188-vpp1.c
> > index e8f0f7eca097..f4b35336d427 100644
> > --- a/drivers/clk/mediatek/clk-mt8188-vpp1.c
> > +++ b/drivers/clk/mediatek/clk-mt8188-vpp1.c
> > @@ -91,6 +91,15 @@ static const struct mtk_clk_desc vpp1_desc = {
> >   	.num_clks = ARRAY_SIZE(vpp1_clks),
> >   };
> >   
> > +static const struct of_device_id of_match_clk_mt8188_vpp1[] = {
> > +	{
> > +		.compatible = "mediatek,mt8188-vppsys1",
> > +		.data = &vpp1_desc,
> > +	}, {
> > +		/* sentinel */
> > +	}
> > +};
> > +
> >   static const struct platform_device_id clk_mt8188_vpp1_id_table[]
> > = {
> >   	{ .name = "clk-mt8188-vpp1", .driver_data =
> > (kernel_ulong_t)&vpp1_desc },
> >   	{ /* sentinel */ }
> > @@ -98,12 +107,11 @@ static const struct platform_device_id
> > clk_mt8188_vpp1_id_table[] = {
> >   MODULE_DEVICE_TABLE(platform, clk_mt8188_vpp1_id_table);
> >   
> >   static struct platform_driver clk_mt8188_vpp1_drv = {
> > -	.probe = mtk_clk_pdev_probe,
> > -	.remove_new = mtk_clk_pdev_remove,
> > +	.probe = mtk_clk_simple_probe,
> >   	.driver = {
> >   		.name = "clk-mt8188-vpp1",
> > +		.of_match_table = of_match_clk_mt8188_vpp1,
> >   	},
> > -	.id_table = clk_mt8188_vpp1_id_table,
> >   };
> >   module_platform_driver(clk_mt8188_vpp1_drv);
> >   MODULE_LICENSE("GPL");
> 
>