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From: Heiko Thiery <heiko.thiery@gmail.com>
To: u-boot@lists.denx.de, Peng Fan <peng.fan@nxp.com>
Cc: Fabio Estevam <festevam@gmail.com>, Michael Walle <michael@walle.cc>
Subject: Re: imx: imx8mq: mxc_get_clock for MXC_I2C_CLK is missing
Date: Wed, 8 Sep 2021 17:45:25 +0200	[thread overview]
Message-ID: <CAEyMn7bhLDEeoAaLSqzb8oKEQdKRyfLXQ8_NOX5bnTuorEsw3w@mail.gmail.com> (raw)
In-Reply-To: <CAEyMn7bNxpqxZfdvgPj8fZbiFiAc8J__wOD6UEZ59U2A9p7yeg@mail.gmail.com>

Hi,

Am Mi., 8. Sept. 2021 um 16:07 Uhr schrieb Heiko Thiery
<heiko.thiery@gmail.com>:
>
> Hi,
>
> Am Mi., 8. Sept. 2021 um 15:08 Uhr schrieb Heiko Thiery
> <heiko.thiery@gmail.com>:
> >
> > Hi Peng,
> >
> > I faced an issue with the I2C bus speed in SPL for the imx8mq. I
> > figured out that the bus frequency is set to about 1MHz. While digging
> > into that I found that the clk ID for the I2C is not returned for the
> > imx8mq correctly.
> >
> > Can you confirm that this is missing here.
> >
> > This is what I added and now it looks better.
>
> Just measured the frequency and it is still not ok. It changed from
> 1MHz to 400kHZ. But expected is 100KHz.

Hi. I think now I understand that the SPL configures the I2C to 100kHz
and after that U-Boot will configure the 400kHz frequency due to the
dts configuration. I will measure the SPL vs U-Boot frequencies
tomorrow. I will confirm that after that.

-- 
Heiko

  reply	other threads:[~2021-09-08 15:45 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 13:08 imx: imx8mq: mxc_get_clock for MXC_I2C_CLK is missing Heiko Thiery
2021-09-08 14:07 ` Heiko Thiery
2021-09-08 15:45   ` Heiko Thiery [this message]
2021-09-09  8:08     ` Heiko Thiery
2021-09-15  2:53 ` Peng Fan (OSS)

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