[PATCH 00/11] arm64: dts: renesas: Specify ethernet PHY reset timings

[Geert Uytterhoeven]

Hi Marek,

On Tue, 5 May 2026 at 05:43, Marek Vasut
<marek.vasut+renesas at mailbox.org> wrote:
> This is the same patch for various boards, details are below.
> The discussion that prompted this patchset is at [0].

Thanks for your series!

> The KSZ9031RNX reference manual [1] DS00002096H page 60 FIGURE 7-7:

DS00002117K page 62 FIGURE 7-5

(and page 74 on the older document I had ;-)

> POWER-UP/POWER-DOWN/RESET TIMING Note 2 states, that after the
> de-assertion of reset, wait a minimum of 100 us before starting
> programming on the MIIM (MDC/MDIO) interface. Set DT property
> reset-deassert-us to three times that, 300 us, to provide ample
> time between reset deassertion and MDIO access.
>
> The KSZ9031RNX reference manual [1] DS00002096H page 60 TABLE 7-7:
> POWER-UP/POWER-DOWN/RESET TIMING PARAMETERS row tSR Stable supply

page 62 TABLE 7-4

> voltages to de-assertion of reset is at minimum 10 ms. Set DT
> property reset-assert-us to 10ms because the KSZ9031RNX RM does
> not explicitly spell out how long the reset has to be asserted,
> but this at least covers the worst case scenario.
>
> The Gray Hawk patch in this series depends on [2].
>
> [0] https://lore.kernel.org/all/CAMuHMdXJvrsXitGagqZJ_STdTTh_s1cBAKf6+esihaVWjfn40g@mail.gmail.com/
> [1] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/KSZ9031MNX-Data-Sheet-DS00002096.pdf

This link leads to the KSZ9031MNX part. Correct link is:

https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/KSZ9031RNX-Data-Sheet-DS00002117.pdf

> [2] https://lore.kernel.org/all/20260504225428.114959-1-marek.vasut+renesas@mailbox.org/

Shall I do the big search-and-replace while applying?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

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