linux-kernel - Re: [PATCH] clk: imx8mp: Set the correct parent for audio_root

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Date:   Fri, 22 May 2020 12:12:32 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     Aisheng Dong <aisheng.dong@....com>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] clk: imx8mp: Set the correct parent for audio_root_clk

On 20-04-30 10:18:24, Aisheng Dong wrote:
> > From: Abel Vesa <abel.vesa@....com>
> > Sent: Thursday, April 30, 2020 6:11 PM
> > 

Sorry I didn't answer the other ones earlier. See below.

> > On 20-04-28 08:15:51, Aisheng Dong wrote:
> > > > From: Abel Vesa <abel.vesa@....com>
> > > > Sent: Monday, April 27, 2020 11:11 PM
> > > >
> > > > Instead of ipg_root, the parent needs to be ipg_audio_root.
> > > >
> > > > Signed-off-by: Abel Vesa <abel.vesa@....com>
> > >
> > > I have a few doubts about this patch:
> > > 1. From latest RM, it seems CCGR101 (0x4650) is a shared gate for many audio
> > instances.

Yes. This is true. I'm working on adding the shared gate now.

> > > 2. If this patch is about AUDIO_AHB_CLK_ROOT, then it's parent is
> > AHB[POST_PODF] from the clock tree in RM.
> > > Not quite understand why this patch changes to IPG[POST_PODF]. Is this RM
> > incorrect issue?

Yes. Right again. It needs to be the IMX8MP_CLK_AUDIO_AHB. Will change that now.

> > >
> > > BTW, if this patch is taken from someone else, we usually better keep the
> > original author if not fundamental changes.
> > >
> > 
> > I made this change at the suggestion from S.j. Wang.
> > I'm the original author in linux-nxp (internal tree).
> > 
> 
> That's fine. Then please ignore my "stupid" reminder. 😊
> BTW, how about other questions?
> 
> Regards
> Aisheng
> 
> > > Regards
> > > Aisheng
> > >
> > > > ---
> > > >  drivers/clk/imx/clk-imx8mp.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/clk/imx/clk-imx8mp.c
> > > > b/drivers/clk/imx/clk-imx8mp.c index 41469e2..dcdfc9d 100644
> > > > --- a/drivers/clk/imx/clk-imx8mp.c
> > > > +++ b/drivers/clk/imx/clk-imx8mp.c
> > > > @@ -727,7 +727,7 @@ static int imx8mp_clocks_probe(struct
> > > > platform_device
> > > > *pdev)
> > > >  	hws[IMX8MP_CLK_HDMI_ROOT] =
> > imx_clk_hw_gate4("hdmi_root_clk",
> > > > "hdmi_axi", ccm_base + 0x45f0, 0);
> > > >  	hws[IMX8MP_CLK_TSENSOR_ROOT] =
> > > > imx_clk_hw_gate4("tsensor_root_clk", "ipg_root", ccm_base + 0x4620, 0);
> > > >  	hws[IMX8MP_CLK_VPU_ROOT] = imx_clk_hw_gate4("vpu_root_clk",
> > > > "vpu_bus", ccm_base + 0x4630, 0);
> > > > -	hws[IMX8MP_CLK_AUDIO_ROOT] = imx_clk_hw_gate4("audio_root_clk",
> > > > "ipg_root", ccm_base + 0x4650, 0);
> > > > +	hws[IMX8MP_CLK_AUDIO_ROOT] = imx_clk_hw_gate4("audio_root_clk",
> > > > +"ipg_audio_root", ccm_base + 0x4650, 0);
> > > >
> > > >  	hws[IMX8MP_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core",
> > > >  					     hws[IMX8MP_CLK_A53_CORE]->clk,
> > > > --
> > > > 2.7.4
> > >