linux-kernel - Re: [PATCH v2 0/7] soc: renesas: Identify SoC and register with the SoC bus

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Message-ID: <20161107183326.GA8329@kozik-lap>
Date:   Mon, 7 Nov 2016 20:33:26 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yangbo Lu <yangbo.lu@....com>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Dirk Behme <dirk.behme@...bosch.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Pankaj Dubey <pankaj.dubey@...sung.com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] soc: renesas: Identify SoC and register with the
 SoC bus

On Mon, Nov 07, 2016 at 10:35:31AM +0100, Geert Uytterhoeven wrote:
> On Mon, Oct 31, 2016 at 12:30 PM, Geert Uytterhoeven
> <geert+renesas@...der.be> wrote:
> > Some Renesas SoCs may exist in different revisions, providing slightly
> > different functionalities (e.g. R-Car H3 ES1.x and ES2.0), and behavior
> > (errate and quirks).  This needs to be catered for by drivers and/or
> > platform code.  The recently proposed soc_device_match() API seems like
> > a good fit to handle this.
> >
> > This patch series implements the core infrastructure to provide SoC and
> > revision information through the SoC bus for Renesas ARM SoCs. It
> > consists of 7 patches:
> >   - Patches 1-4 provide soc_device_match(), with some related fixes,
> >   - Patches 5-7 implement identification of Renesas SoCs and
> >     registration with the SoC bus,
> >
> > Changes compared to v1:
> >   - Add Acked-by,
> >   - New patches:
> >       - "[4/7] base: soc: Provide a dummy implementation of
> >                soc_device_match()",
> >       - "[5/7] ARM: shmobile: Document DT bindings for CCCR and PRR",
> >       - "[6/7] arm64: dts: r8a7795: Add device node for PRR"
> >         (more similar patches available, I'm not yet spamming you all
> >          with them),
> >   - Drop SoC families and family names; use fixed "Renesas" instead,
> >   - Drop EMEV2, which doesn't have a chip ID register, and doesn't share
> >     devices with other SoCs,
> >   - Drop RZ/A1H and R-CAR M1A, which don't have chip ID registers (for
> >     M1A: not accessible from the ARM core?),
> >   - On arm, move "select SOC_BUS" from ARCH_RENESAS to Kconfig symbols
> >     for SoCs that provide a chip ID register,
> >   - Build renesas-soc only if SOC_BUS is enabled,
> >   - Use "renesas,prr" and "renesas,cccr" device nodes in DT if
> >     available, else fall back to hardcoded addresses for compatibility
> >     with existing DTBs,
> >   - Remove verification of product IDs; just print the ID instead,
> >   - Don't register the SoC bus if the chip ID register is missing,
> >   - Change R-Mobile APE6 fallback to use PRR instead of CCCR (it has
> >     both).
> >
> > Merge strategy:
> >   - In theory, patches 1-4 should go through Greg's driver core tree.
> >     But it's a hard dependency for all users.
> >     If people agree, I can provide an immutable branch in my
> >     renesas-drivers repository, to be merged by all interested parties.
> >     So far I'm aware of Freescale/NXP, and Renesas.
> 
> And Samsung.

Yes, I would need it as well.

> Shall I create the immutable branch now?

...or the applying person could provide one.

Best regards,
Krzysztof