Re: [PATCH 4/9] arm: dts: renesas: porter: Specify ethernet PHY reset timings

On Tue, 14 Jul 2026 at 15:04, Marek Vasut
<[email protected]> wrote:
> The KSZ8041RNL reference manual [1] DS00002245C page 47 TABLE 7-10:
> POWER-UP/RESET TIMING PARAMETERS does not indicate how long should
> the system wait after deassertion of the PHY reset and before start
> of communication with the PHY via MDIO. Opt for the same value as
> used for KSZ9031RNX, which is 300 us.
>
> The KSZ8041RNL reference manual [1] DS00002245C page 47 TABLE 7-10:
> POWER-UP/RESET TIMING PARAMETERS row tSR Stable supply voltages to
> reset high is at minimum 10 ms. Set the DT property reset-assert-us
> to 10ms because the KSZ8041RNL RM does not explicitly spell out how
> long the reset has to be asserted, but this at least covers the worst
> case scenario.
>
> [1] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/00002841D.pdf
>
> Signed-off-by: Marek Vasut <[email protected]>

Reviewed-by: Geert Uytterhoeven <[email protected]>
i.e. will queue in renesas-devel for v7.4, with the URL corrected.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

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