linux-kernel - Re: [PATCH 0/2] arm64: dts: renesas: Add SD/OE pin properties

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Message-ID: <CAMuHMdUmf=BYrVWGDp4kjLGK=66HSMJbHuMvne-xGLkTYnGv2g@mail.gmail.com>
Date: Fri, 27 Sep 2024 12:07:50 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Sean Anderson <sean.anderson@...ux.dev>
Cc: linux-arm-kernel@...ts.infradead.org, Adam Ford <aford173@...il.com>, 
	Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>, 
	Biju Das <biju.das@...renesas.com>, 
	Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>, linux-renesas-soc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	Conor Dooley <conor+dt@...nel.org>, Magnus Damm <magnus.damm@...il.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 0/2] arm64: dts: renesas: Add SD/OE pin properties

Hi Sean,

On Thu, Sep 26, 2024 at 8:24 PM Sean Anderson <sean.anderson@...ux.dev> wrote:
> On 9/26/24 14:09, Sean Anderson wrote:
> > Linux can configure almost every part of this clock generator without
> > relying on the OTP settings. However, the correct configuration for the
> > SD/OE pin cannot be determined automatically. Therefore, add the
> > appropriate properties to configure this pin.
> >
> > I have CC'd some people who appear to have access to the following
> > boards which use the versaclock5:
> >
> > - Salvator-X
> > - HiHope RZ/G2[MN] Main Board
> > - Beacon Embedded Works RZ/G2N Development Kit
> >
> > as I could not find schematics for these boards. You can help me out by
> > (pick one):
> >
> > - Run the following command and send me the output:
> >
> >     $ grep 10: /sys/kernel/debug/regmap/*-006a/registers

On Salvator-X (5p49v5923) and ULCB (5p49v5925): 82
On Salvator-XS (5p49v6901): 8a

> > - Inspect (or send me) the schematic to determine the state of the SD/OE
> >   pin during normal operation.
> >
> > My suspicion is that all of these boards use the same configuration
> > (SD/OE pin tied high) owing to their common design heritage. Thanks in
> > advance.

According to the schematics, the SD/OE pin is indeed strapped high on
all of the Salvator-X(S), ULCB, HiHope, and Renesom base and SoM boards.

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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