From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jorge Ramirez-Ortiz, Foundries <jorge@foundries.io>
Date: Mon, 19 Oct 2020 14:57:19 +0200
Subject: [PATCH] mx6: peripheral clock from oscillator
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References: <20201014130726.21984-1-jorge@foundries.io>
 <CAOMZO5A2X=B=t==_57Q5MB2hMnr-xLS0aDzOC5sjE+9ogLCxEA@mail.gmail.com>
Message-ID: <20201019125719.GA22464@trex>
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On 19/10/20, Fabio Estevam wrote:
> Hi Jorge,
> 
> On Wed, Oct 14, 2020 at 10:07 AM Jorge Ramirez-Ortiz <jorge@foundries.io> wrote:
> >
> > In order to be able to run the I2C bus at 400Khz, the chip errata[1]
> > recommends that the peripheral clock runs out of the 24MHz oscillator.
> >
> > [1] Rev 2, 10/2019, ERR007805
> >
> > Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
> > ---
> >  arch/arm/mach-imx/mx6/soc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/mach-imx/mx6/soc.c b/arch/arm/mach-imx/mx6/soc.c
> > index e129286065..1da250bbcd 100644
> > --- a/arch/arm/mach-imx/mx6/soc.c
> > +++ b/arch/arm/mach-imx/mx6/soc.c
> > @@ -469,7 +469,7 @@ int arch_cpu_init(void)
> >         }
> >
> >         /* Set perclk to source from OSC 24MHz */
> > -       if (is_mx6sl())
> > +       if (is_mx6sl() || is_mx6ull())
> 
> According to https://www.nxp.com/docs/en/errata/IMX6SDLCE.pdf the
> mx6solo and mx6dl are also affected by ERR007805.

ah ok, I'll repost.

just as background info, this is needed in order for OP-TEE to access
the EdgeLock SE050 secure element at a decent speed. I couldnt merge
the support for the imx6ul i2c driver during the last OP-TEE release
but will try again when I find some time (surely before their next
release)


> 
> These variants should be handled too.