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From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	 Rob Herring <robh+dt@kernel.org>,
	Magnus Damm <magnus.damm@gmail.com>,
	 Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	 Will Deacon <will@kernel.org>, Jiri Slaby <jirislaby@kernel.org>,
	 Philipp Zabel <p.zabel@pengutronix.de>,
	 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	 Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	 "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 Biju Das <biju.das.jz@bp.renesas.com>
Subject: Re: [PATCH 02/16] dt-bindings: arm: renesas: Document Renesas RZ/G2{L,LC} SoC variants
Date: Thu, 27 May 2021 12:49:40 +0100	[thread overview]
Message-ID: <CA+V-a8uB5308YszoxeuTr_3UwXC-BK9bXz58B2iR4kfadTUOjg@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdWKdrn7ikT_qRrb0pVYxk3g7MgVk+qwJER61gbesQiPHA@mail.gmail.com>

Hi Geert,

On Thu, May 27, 2021 at 12:28 PM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, May 21, 2021 at 7:10 PM Lad, Prabhakar
> <prabhakar.csengg@gmail.com> wrote:
> > On Fri, May 21, 2021 at 2:23 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > > On Fri, May 14, 2021 at 9:23 PM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > > > Add device tree bindings documentation for Renesas RZ/G2{L,LC}
> > > > SoC variants.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
> > >
> > > > --- a/Documentation/devicetree/bindings/arm/renesas.yaml
> > > > +++ b/Documentation/devicetree/bindings/arm/renesas.yaml
> > > > @@ -308,6 +308,15 @@ properties:
> > > >                - renesas,r9a07g043u11 # Single Cortex-A55 RZ/G2UL
> > > >            - const: renesas,r9a07g043
> > > >
> > > > +      - description: RZ/G2{L,LC} (R9A07G044)
> > > > +        items:
> > > > +          - enum:
> > > > +              - renesas,r9a07g044c1 # Single Cortex-A55 RZ/G2LC
> > > > +              - renesas,r9a07g044c2 # Dual Cortex-A55 RZ/G2LC
> > > > +              - renesas,r9a07g044l1 # Single Cortex-A55 RZ/G2L
> > > > +              - renesas,r9a07g044l2 # Dual Cortex-A55 RZ/G2L
> > >
> > > Given the LSI DEVID is the same for all four, and presumably they're
> > > thus the same die with different packaging, do we need these four
> > > compatible values?
> > >
> > Yes the LSI DEVID is the same for all the above, so as to
> > differentiate between each SoC's, these compatible strings are added.
>
> OK, especially for single-core versus dual-core, this can be useful,
> if "integration issues" pop up depending on the number of cores
> or other functionality being present.
>
> > * For example some IP blocks which are present on RZ/G2L aren't
> > present in RZ/G2LC.
>
> That'll be handled by the .dtsi, right?
>
Agreed.

Cheers,
Prabhakar

> > * Adding this to DTS gives an opportunity to stop booting if the wrong
> > DTB is loaded into the board.
>
> This only works for SoCs with different LSI DEVIDs.
> As all four above have the same LSI DEVID, you can only distinguish
> them by the main compatible value.  It does not protect against
> loading an RZ/G2LC DTB on an RZ/G2L board or vice versa.
>
> 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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  reply	other threads:[~2021-05-27 11:51 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-14 19:22 [PATCH 00/16] Add new Renesas RZ/G2L SoC and Renesas RZ/G2L SMARC EVK support Lad Prabhakar
2021-05-14 19:22 ` [PATCH 01/16] dt-bindings: arm: renesas: Document Renesas RZ/G2UL SoC Lad Prabhakar
2021-05-18  1:31   ` Rob Herring
2021-05-21 13:22   ` Geert Uytterhoeven
2021-05-21 16:54     ` Lad, Prabhakar
2021-05-27 11:29       ` Geert Uytterhoeven
2021-05-27 11:47         ` Lad, Prabhakar
2021-05-14 19:22 ` [PATCH 02/16] dt-bindings: arm: renesas: Document Renesas RZ/G2{L, LC} SoC variants Lad Prabhakar
2021-05-18  1:31   ` Rob Herring
2021-05-21 13:23   ` [PATCH 02/16] dt-bindings: arm: renesas: Document Renesas RZ/G2{L,LC} " Geert Uytterhoeven
2021-05-21 17:09     ` Lad, Prabhakar
2021-05-27 11:28       ` Geert Uytterhoeven
2021-05-27 11:49         ` Lad, Prabhakar [this message]
2021-05-14 19:22 ` [PATCH 03/16] dt-bindings: arm: renesas: Document SMARC EVK Lad Prabhakar
2021-05-18  1:32   ` Rob Herring
2021-05-21 13:24   ` Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 04/16] soc: renesas: Add ARCH_R9A07G044{L, LC} for the new RZ/G2{L, LC} SoC's Lad Prabhakar
2021-05-21 13:25   ` [PATCH 04/16] soc: renesas: Add ARCH_R9A07G044{L, LC} for the new RZ/G2{L,LC} SoC's Geert Uytterhoeven
2021-05-21 17:21     ` Lad, Prabhakar
2021-05-27 11:47       ` Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 05/16] arm64: defconfig: Enable ARCH_R9A07G044{L,LC} Lad Prabhakar
2021-05-14 19:22 ` [PATCH 06/16] dt-bindings: arm: renesas, prr: Add new compatible string for RZ/G{L, LC, UL} Lad Prabhakar
2021-05-18  1:33   ` Rob Herring
2021-05-21 13:25   ` [PATCH 06/16] dt-bindings: arm: renesas,prr: Add new compatible string for RZ/G{L,LC,UL} Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 07/16] soc: renesas: Add support to read LSI DEVID register Lad Prabhakar
2021-05-14 19:22 ` [PATCH 08/16] soc: renesas: Add support to identify RZ/G2{L, LC} SoC's Lad Prabhakar
2021-05-14 19:22 ` [PATCH 09/16] dt-bindings: serial: renesas, scif: Document r9a07g044 bindings Lad Prabhakar
2021-05-18  1:33   ` Rob Herring
2021-05-21 13:26   ` [PATCH 09/16] dt-bindings: serial: renesas,scif: " Geert Uytterhoeven
2021-05-21 15:15     ` Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 10/16] serial: sh-sci: Add support for RZ/G2L SoC Lad Prabhakar
2021-05-21 13:26   ` Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 11/16] dt-bindings: clock: renesas: Document RZ/G2L SoC CPG driver Lad Prabhakar
2021-05-18  1:35   ` Rob Herring
2021-05-21 15:04   ` Geert Uytterhoeven
2021-05-21 18:42     ` Lad, Prabhakar
2021-05-27 11:51       ` Geert Uytterhoeven
2021-05-14 19:22 ` [PATCH 12/16] clk: renesas: Define RZ/G2L CPG Clock Definitions Lad Prabhakar
2021-05-21 15:03   ` Geert Uytterhoeven
2021-05-21 15:19   ` Geert Uytterhoeven
2021-05-21 18:37     ` Lad, Prabhakar
2021-05-14 19:22 ` [PATCH 13/16] clk: renesas: Add CPG core wrapper for RZ/G2L SoC Lad Prabhakar
2021-05-21 15:02   ` Geert Uytterhoeven
2021-05-27 12:04   ` Geert Uytterhoeven
2021-05-28  7:51     ` Lad, Prabhakar
2021-05-14 19:22 ` [PATCH 14/16] clk: renesas: Add support for R9A07G044L SoC Lad Prabhakar
2021-05-14 19:22 ` [PATCH 15/16] arm64: dts: renesas: Add initial DTSI for RZ/G2{L, LC} SoC's Lad Prabhakar
2021-05-21 15:35   ` [PATCH 15/16] arm64: dts: renesas: Add initial DTSI for RZ/G2{L,LC} SoC's Geert Uytterhoeven
2021-05-21 18:36     ` Lad, Prabhakar
2021-05-27 11:17   ` Geert Uytterhoeven
2021-05-27 11:51     ` Lad, Prabhakar
2021-05-14 19:22 ` [PATCH 16/16] arm64: dts: renesas: Add initial device tree for RZ/G2L SMARC EVK Lad Prabhakar
2021-05-21 15:40   ` Geert Uytterhoeven
2021-05-21 18:21     ` Lad, Prabhakar

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