linux-kernel - RE: [EXT] Re: [PATCH 1/2] i2c: imx: I2C Driver doesn't consider I2C_IPGCLK

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Message-ID: <AM6PR04MB43571B8D52C1FE9ED20DBA1D97360@AM6PR04MB4357.eurprd04.prod.outlook.com>
Date:   Sat, 4 May 2019 09:28:48 +0000
From:   Chuanhua Han <chuanhua.han@....com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
CC:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "eha@...f.com" <eha@...f.com>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "peda@...ntia.se" <peda@...ntia.se>,
        Sumit Batra <sumit.batra@....com>
Subject: RE: [EXT] Re: [PATCH 1/2] i2c: imx: I2C Driver doesn't consider
 I2C_IPGCLK_SEL RCW bit when using ls1046a SoC



> -----Original Message-----
> From: Sascha Hauer <s.hauer@...gutronix.de>
> Sent: 2019年4月30日 20:51
> To: Chuanhua Han <chuanhua.han@....com>
> Cc: shawnguo@...nel.org; Leo Li <leoyang.li@....com>; robh+dt@...nel.org;
> mark.rutland@....com; linux-kernel@...r.kernel.org;
> linux-i2c@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; festevam@...il.com; dl-linux-imx
> <linux-imx@....com>; wsa+renesas@...g-engineering.com;
> u.kleine-koenig@...gutronix.de; eha@...f.com; linux@...pel-privat.de;
> l.stach@...gutronix.de; peda@...ntia.se; Sumit Batra
> <sumit.batra@....com>
> Subject: [EXT] Re: [PATCH 1/2] i2c: imx: I2C Driver doesn't consider
> I2C_IPGCLK_SEL RCW bit when using ls1046a SoC
> 
> Caution: EXT Email
> 
> On Tue, Apr 30, 2019 at 12:47:18PM +0800, Chuanhua Han wrote:
> > The current kernel driver does not consider I2C_IPGCLK_SEL (424 bit of
> > RCW) in deciding  i2c_clk_rate in function i2c_imx_set_clk() { 0
> > Platform clock/4, 1 Platform clock/2}.
> >
> > When using ls1046a SoC, this populates incorrect value in IBFD
> > register if I2C_IPGCLK_SEL = 0, which generates half of the desired Clock.
> >
> > Therefore, if ls1046a SoC is used, we need to set the i2c clock
> > according to the corresponding RCW.
> 
> So the clock driver reports the wrong clock. Please fix the clock driver then.
No, this is a problem with the i2c driver. It is not a problem with the clock driver, so the i2c driver needs to be modified.
> 
> Sascha
> 
> --
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