linux-kernel - Re: [PATCH v3 01/15] dt-bindings: pinctrl: renesas: Document RZ/V2H(P) SoC

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Message-ID: <CA+V-a8tWxGBkuOY=G3RaB_0NXS3ShE-nL+5t49=_mJGvo6j6yQ@mail.gmail.com>
Date: Wed, 5 Jun 2024 10:39:07 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>, Linus Walleij <linus.walleij@...aro.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Paul Barker <paul.barker.ct@...renesas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 01/15] dt-bindings: pinctrl: renesas: Document
 RZ/V2H(P) SoC

Hi Rob,

Thank you for the review.

On Tue, Jun 4, 2024 at 4:36 PM Rob Herring <robh@...nel.org> wrote:
>
> On Thu, May 30, 2024 at 06:38:43PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Add documentation for the pin controller found on the Renesas RZ/V2H(P)
> > (R9A09G057) SoC. The RZ/V2H PFC varies slightly compared to the RZ/G2L
> > family:
> > - Additional bits need to be set during pinmuxing.
> > - The GPIO pin count is different.
> >
> > Hence, a SoC-specific compatible string, 'renesas,r9a09g057-pinctrl', is
> > added for the RZ/V2H(P) SoC.
> >
> > Also, add the 'renesas,output-impedance' property. The drive strength
> > setting on RZ/V2H(P) depends on the different power rails coming out from
> > the PMIC (connected via I2C). These power rails (required for drive
> > strength) can be 1.2V, 1.8V, or 3.3V.
> >
> > Pins are grouped into 4 groups:
> >
> > Group 1: Impedance
> > - 150/75/38/25 ohms (at 3.3V)
> > - 130/65/33/22 ohms (at 1.8V)
> >
> > Group 2: Impedance
> > - 50/40/33/25 ohms (at 1.8V)
> >
> > Group 3: Impedance
> > - 150/75/37.5/25 ohms (at 3.3V)
> > - 130/65/33/22 ohms (at 1.8V)
> >
> > Group 4: Impedance
> > - 110/55/30/20 ohms (at 1.8V)
> > - 150/75/38/25 ohms (at 1.2V)
> >
> > The 'renesas,output-impedance' property, as documented, can be
> > [0, 1, 2, 3], these correspond to register bit values that can
> > be set in the PFC_IOLH_mn register, which adjusts the drive
> > strength value and is pin-dependent.
> >
> > As power rail information may not be available very early in the boot
> > process, the 'renesas,output-impedance' property is added instead of
> > reusing the 'output-impedance-ohms' property.
> >
> > Also, allow bias-disable, bias-pull-down and bias-pull-up properties
> > as these can be used to configure the pins.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v2->v3
> > - Updated description for renesas,output-impedance property
> > - Updated commit description
> >
> > RFC->v2
> > - Renamed renesas-rzv2h,output-impedance -> renesas,output-impedance
> > - Updated values for renesas,output-impedance
> > - Added bias properties
> > ---
> >  .../pinctrl/renesas,rzg2l-pinctrl.yaml        | 23 +++++++++++++++----
> >  1 file changed, 19 insertions(+), 4 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml
> > index 881e992adca3..957b9f7e7de5 100644
> > --- a/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml
> > +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml
> > @@ -26,6 +26,7 @@ properties:
> >                - renesas,r9a07g043-pinctrl # RZ/G2UL{Type-1,Type-2} and RZ/Five
> >                - renesas,r9a07g044-pinctrl # RZ/G2{L,LC}
> >                - renesas,r9a08g045-pinctrl # RZ/G3S
> > +              - renesas,r9a09g057-pinctrl # RZ/V2H(P)
> >
> >        - items:
> >            - enum:
> > @@ -66,10 +67,14 @@ properties:
> >      maxItems: 1
> >
> >    resets:
> > -    items:
> > -      - description: GPIO_RSTN signal
> > -      - description: GPIO_PORT_RESETN signal
> > -      - description: GPIO_SPARE_RESETN signal
> > +    oneOf:
> > +      - items:
> > +          - description: GPIO_RSTN signal
> > +          - description: GPIO_PORT_RESETN signal
> > +          - description: GPIO_SPARE_RESETN signal
> > +      - items:
> > +          - description: PFC main reset
> > +          - description: Reset for the control register related to WDTUDFCA and WDTUDFFCM pins
>
> You need a conditional schema for ensuring the length is 2 for RZ/V2H
> and 3 otherwise.
>
Ok, I will add a conditional schema.

> >
> >  additionalProperties:
> >    anyOf:
> > @@ -111,6 +116,16 @@ additionalProperties:
> >          output-high: true
> >          output-low: true
> >          line-name: true
> > +        bias-disable: true
> > +        bias-pull-down: true
> > +        bias-pull-up: true
> > +        renesas,output-impedance:
> > +          description: |
>
> Don't need '|'.
>
Agreed, I will drop it.

> > +            Output impedance for pins on the RZ/V2H(P) SoC. Values 0, 1, 2, and 3
>
> Don't repeat values in free form text.
>
OK, I will fix the above and send a v6 series.

Cheers,
Prabhakar