linux-kernel - RE: [PATCH v2 2/5] clk: imx: replace osc

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Message-ID: <DU0PR04MB9417ACE65DC5AE841BEC5324880D9@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Tue, 22 Nov 2022 02:48:23 +0000
From:   Peng Fan <peng.fan@....com>
To:     Abel Vesa <abel.vesa@...aro.org>,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-amarula@...rulasolutions.com" 
        <linux-amarula@...rulasolutions.com>,
        "michael@...rulasolutions.com" <michael@...rulasolutions.com>,
        Abel Vesa <abelvesa@...nel.org>,
        Anson Huang <Anson.Huang@....com>,
        Fabio Estevam <festevam@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        dl-linux-imx <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        "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 v2 2/5] clk: imx: replace osc_hdmi with dummy

> Subject: Re: [PATCH v2 2/5] clk: imx: replace osc_hdmi with dummy
> 
> On 22-11-17 12:36:34, Dario Binacchi wrote:
> > There is no occurrence of the hdmi oscillator in the reference manual
> > (document IMX8MNRM Rev 2, 07/2022). Further, if we consider the
> > indexes
> > 76-81 and 134 of the "Clock Root" table of chapter 5 of the RM, there
> > is no entry for the source select bits 101b, which is the setting
> > referenced by "osc_hdmi".
> > Fix by renaming "osc_hdmi" with "dummy", a clock which has already
> > been used for missing source select bits.
> >
> > Tested on the BSH SystemMaster (SMM) S2 board.
> >
> > Fixes: 96d6392b54dbb ("clk: imx: Add support for i.MX8MN clock
> > driver")
> > Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> 
> I don't think this is correct. It might even break the EVKs HDMI support.
> 
> Peng, can you please confirm ?

The reference manual not has osc hdmi as clk sel. So It is ok to use dummy.

Regards,
Peng.
> 
> > ---
> >
> > (no changes since v1)
> >
> >  drivers/clk/imx/clk-imx8mn.c | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx8mn.c
> > b/drivers/clk/imx/clk-imx8mn.c index 72f9563a0ff6..0fae97e61e2c 100644
> > --- a/drivers/clk/imx/clk-imx8mn.c
> > +++ b/drivers/clk/imx/clk-imx8mn.c
> > @@ -108,27 +108,27 @@ static const char * const
> imx8mn_disp_pixel_sels[] = {"osc_24m", "video_pll1_out
> >  						      "sys_pll3_out",
> "clk_ext4", };
> >
> >  static const char * const imx8mn_sai2_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						"video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						"video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						"clk_ext3", "clk_ext4", };
> >
> >  static const char * const imx8mn_sai3_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						"video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						"video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						"clk_ext3", "clk_ext4", };
> >
> >  static const char * const imx8mn_sai5_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						"video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						"video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						"clk_ext2", "clk_ext3", };
> >
> >  static const char * const imx8mn_sai6_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						"video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						"video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						"clk_ext3", "clk_ext4", };
> >
> >  static const char * const imx8mn_sai7_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						"video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						"video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						"clk_ext3", "clk_ext4", };
> >
> >  static const char * const imx8mn_spdif1_sels[] = {"osc_24m",
> "audio_pll1_out", "audio_pll2_out",
> > -						  "video_pll1_out",
> "sys_pll1_133m", "osc_hdmi",
> > +						  "video_pll1_out",
> "sys_pll1_133m", "dummy",
> >  						  "clk_ext2", "clk_ext3", };
> >
> >  static const char * const imx8mn_enet_ref_sels[] = {"osc_24m",
> > "sys_pll2_125m", "sys_pll2_50m",
> > --
> > 2.32.0
> >