Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Thu, 13 Oct 2022 10:24:18 +0200 | Subject | Re: [PATCH] dt-bindings: memory: renesas,rpc-if: Document R-Car V4H support |
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Hi Wolfram,
On Thu, Oct 13, 2022 at 10:00 AM Wolfram Sang <wsa+renesas@sang-engineering.com> wrote: > > I actually wrote such a patch a while back. > > However, I didn't send it after discovering the R-Car V3U Series > > User’s Manual Rev. 0.50 does not mention the fourth Strobe Timing > > Adjustment bit (STRTIM) in the RPC-IF PHY Control Register (PHYCNT), > > which is present on R-Car S4-8 and V4H, but not on R-Car Gen3. > > I see. Thanks for the heads up! Maybe this is worth a comment because it > is an exception to the usual behaviour?
You mean an exception to the exception to the usual behaviour that R-Car <foo>3 is part of the R-Car Gen3 family, making it the normal rule? ;-)
We're actually not 100% sure the bit is present or not. Rev. 0.50 is still an early revision of the R-Car V3U documentation, so it might lack some updates. I tried changing all bits of the PHYCNT register, but unfortunately all bits except for bit 31 stick on all SoCs I tried, so we can't use this method to determine which bits exist and which don't.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@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
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