Hi John,
On Mon, 19 May 2025 at 10:56, John Madieu <john.madieu.xa@xxxxxxxxxxxxxx> wrote:
> > From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> > On Mon, 19 May 2025 at 00:08, John Madieu <john.madieu.xa@xxxxxxxxxxxxxx>
> > wrote:
> > > Lower the I2C2 bus clock frequency on the RZ/G3E SMARC SoM from 1MHz
> > > to 400KHz to improve compatibility with a wider range of I2C
> > > peripherals. The previous 1MHz setting was too aggressive for some
> > > devices on the bus, which experienced timing issues at such a frequency.
> > >
> > > --- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
> > > +++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
> > > @@ -85,7 +85,7 @@ &gpu {
> > > &i2c2 {
> > > pinctrl-0 = <&i2c2_pins>;
> > > pinctrl-names = "default";
> > > - clock-frequency = <1000000>;
> > > + clock-frequency = <400000>;
> > > status = "okay";
> > >
> > > raa215300: pmic@12 {
> >
> > Can you please clarify which devices on this bus do not support 1 MHz?
> > Or perhaps this is a board layout issue?
>
> This is mainly the case for the GreenPAK device, that is programmed to
> Operate at 400KHz.
Thanks for the clarification!
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
i.e. will queue in renesas-devel as a fix for v6.16, with the clarification
added.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
