[06/16] dt-bindings: arm: renesas,prr: Add new compatible string for RZ/G{L,LC,UL}

RZ/G2{L,LC,UL} SoC's have LSI_DEVID register to retrieve SoC product and
revision information.

RZ/G{L,LC,UL} SoC's have 28-bit product-id compared to other R-Car and
RZ/G2{E,H,M,N} SoC's hence a new compatible string "renesas,devid" is
added.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 Documentation/devicetree/bindings/arm/renesas,prr.yaml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

On Fri, 14 May 2021 20:22:08 +0100, Lad Prabhakar wrote:
> RZ/G2{L,LC,UL} SoC's have LSI_DEVID register to retrieve SoC product and

> revision information.

> 

> RZ/G{L,LC,UL} SoC's have 28-bit product-id compared to other R-Car and

> RZ/G2{E,H,M,N} SoC's hence a new compatible string "renesas,devid" is

> added.

> 

> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>

> ---

>  Documentation/devicetree/bindings/arm/renesas,prr.yaml | 6 ++++--

>  1 file changed, 4 insertions(+), 2 deletions(-)

> 


Acked-by: Rob Herring <robh@kernel.org>

Hi Prabhakar,

On Fri, May 14, 2021 at 9:23 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> RZ/G2{L,LC,UL} SoC's have LSI_DEVID register to retrieve SoC product and
> revision information.
>
> RZ/G{L,LC,UL} SoC's have 28-bit product-id compared to other R-Car and
> RZ/G2{E,H,M,N} SoC's hence a new compatible string "renesas,devid" is
> added.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/arm/renesas,prr.yaml
> +++ b/Documentation/devicetree/bindings/arm/renesas,prr.yaml
> @@ -12,14 +12,16 @@ maintainers:
>
>  description: |
>    Most Renesas ARM SoCs have a Product Register or Boundary Scan ID
> -  Register that allows to retrieve SoC product and revision information.
> -  If present, a device node for this register should be added.
> +  Register or LSI Device ID Register that allows to retrieve SoC product
> +  and revision information. If present, a device node for this register
> +  should be added.

Note that this register does not seem to be documented, so I have to
trust you on this.

However, from looking at the LSI DEVID register address, this does not
seem to be a lone register (like the Product Register on other SoCs),
but to be part of the System Controller (SYSC).  Hence I think there
should be separate bindings for the whole SYSC block instead.
You can still read the LSI DEVID register from renesas_soc_init(),
using the SYSC node.

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