diff mbox series

[RFC,02/13] dt-bindings: pinctrl: renesas: Document RZ/V2H(P) SoC

Message ID 20240326222844.1422948-3-prabhakar.mahadev-lad.rj@bp.renesas.com
State New
Headers show
Series Add PFC support for Renesas RZ/V2H(P) SoC | expand

Commit Message

Lad, Prabhakar March 26, 2024, 10:28 p.m. UTC 
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Add documentation for the pin controller found on the Renesas RZ/V2H(P)
(R9A09G057) SoC. Compared to RZ/G2L family of SoCs there are slight
differences on the RZ/V2H(P) SoC for pinmuxing.

Also add 'renesas-rzv2h,output-impedance' property. Drive strength
setting on RZ/V2H(P) depends on the different power rails which are
coming out from the PMIC (connected via i2c). These power rails
(required for drive strength) can be 1.2/1.8/3.3V.

Pin are grouped into 4 groups,

Group1: Impedance
- 150/75/38/25 ohms (at 3.3 V)
- 130/65/33/22 ohms (at 1.8 V)

Group2: Impedance
- 50/40/33/25 ohms (at 1.8 V)

Group3: Impedance
- 150/75/37.5/25 ohms (at 3.3 V)
- 130/65/33/22 ohms (at 1.8 V)

Group4: Impedance
- 110/55/30/20 ohms (at 1.8 V)
- 150/75/38/25 ohms (at 1.2 V)

'renesas-rzv2h,output-impedance' property as documented which can be
[1, 2, 4, 6] indicates x Value strength.

As the power rail information cannot be available very early in the
boot process as 'renesas-rzv2h,output-impedance' property is added
instead of reusing output-impedance-ohms property.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 .../pinctrl/renesas,rzg2l-pinctrl.yaml        | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

Comments

Rob Herring (Arm) March 27, 2024, 5:24 p.m. UTC | #1 
On Tue, Mar 26, 2024 at 10:28:33PM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Add documentation for the pin controller found on the Renesas RZ/V2H(P)
> (R9A09G057) SoC. Compared to RZ/G2L family of SoCs there are slight
> differences on the RZ/V2H(P) SoC for pinmuxing.
> 
> Also add 'renesas-rzv2h,output-impedance' property. Drive strength
> setting on RZ/V2H(P) depends on the different power rails which are
> coming out from the PMIC (connected via i2c). These power rails
> (required for drive strength) can be 1.2/1.8/3.3V.
> 
> Pin are grouped into 4 groups,
> 
> Group1: Impedance
> - 150/75/38/25 ohms (at 3.3 V)
> - 130/65/33/22 ohms (at 1.8 V)
> 
> Group2: Impedance
> - 50/40/33/25 ohms (at 1.8 V)
> 
> Group3: Impedance
> - 150/75/37.5/25 ohms (at 3.3 V)
> - 130/65/33/22 ohms (at 1.8 V)
> 
> Group4: Impedance
> - 110/55/30/20 ohms (at 1.8 V)
> - 150/75/38/25 ohms (at 1.2 V)
> 
> 'renesas-rzv2h,output-impedance' property as documented which can be
> [1, 2, 4, 6] indicates x Value strength.

Looks like the values are x1, x1.5, x3ish, x6...

> 
> As the power rail information cannot be available very early in the
> boot process as 'renesas-rzv2h,output-impedance' property is added
> instead of reusing output-impedance-ohms property.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
>  .../pinctrl/renesas,rzg2l-pinctrl.yaml        | 22 +++++++++++++++----
>  1 file changed, 18 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..77f4fc7f4a21 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
>  
>  additionalProperties:
>    anyOf:
> @@ -111,6 +116,15 @@ additionalProperties:
>          output-high: true
>          output-low: true
>          line-name: true
> +        renesas-rzv2h,output-impedance:

'renesas-rzv2h' is not a vendor.

That should give you a warning if you actually used this somewhere.

> +          description: |
> +            Output impedance for pins on RZ/V2H(P) SoC.
> +            x1: Corresponds to 0 in IOLH register.
> +            x2: Corresponds to 1 in IOLH register.
> +            x4: Corresponds to 2 in IOLH register.
> +            x6: Corresponds to 3 in IOLH register.

Why not just use 0-3 for the values? 


> +          $ref: /schemas/types.yaml#/definitions/uint32
> +          enum: [1, 2, 4, 6]
>  
>      - type: object
>        additionalProperties:
> -- 
> 2.34.1
>
Lad, Prabhakar March 27, 2024, 6:58 p.m. UTC | #2 
Hi Rob,

Thank you for the review.

On Wed, Mar 27, 2024 at 5:24 PM Rob Herring <robh@kernel.org> wrote:
>
> On Tue, Mar 26, 2024 at 10:28:33PM +0000, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Add documentation for the pin controller found on the Renesas RZ/V2H(P)
> > (R9A09G057) SoC. Compared to RZ/G2L family of SoCs there are slight
> > differences on the RZ/V2H(P) SoC for pinmuxing.
> >
> > Also add 'renesas-rzv2h,output-impedance' property. Drive strength
> > setting on RZ/V2H(P) depends on the different power rails which are
> > coming out from the PMIC (connected via i2c). These power rails
> > (required for drive strength) can be 1.2/1.8/3.3V.
> >
> > Pin are grouped into 4 groups,
> >
> > Group1: Impedance
> > - 150/75/38/25 ohms (at 3.3 V)
> > - 130/65/33/22 ohms (at 1.8 V)
> >
> > Group2: Impedance
> > - 50/40/33/25 ohms (at 1.8 V)
> >
> > Group3: Impedance
> > - 150/75/37.5/25 ohms (at 3.3 V)
> > - 130/65/33/22 ohms (at 1.8 V)
> >
> > Group4: Impedance
> > - 110/55/30/20 ohms (at 1.8 V)
> > - 150/75/38/25 ohms (at 1.2 V)
> >
> > 'renesas-rzv2h,output-impedance' property as documented which can be
> > [1, 2, 4, 6] indicates x Value strength.
>
> Looks like the values are x1, x1.5, x3ish, x6...
>
> >
> > As the power rail information cannot be available very early in the
> > boot process as 'renesas-rzv2h,output-impedance' property is added
> > instead of reusing output-impedance-ohms property.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> >  .../pinctrl/renesas,rzg2l-pinctrl.yaml        | 22 +++++++++++++++----
> >  1 file changed, 18 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..77f4fc7f4a21 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
> >
> >  additionalProperties:
> >    anyOf:
> > @@ -111,6 +116,15 @@ additionalProperties:
> >          output-high: true
> >          output-low: true
> >          line-name: true
> > +        renesas-rzv2h,output-impedance:
>
> 'renesas-rzv2h' is not a vendor.
>
I will update this to "renesas,output-impedance".

> That should give you a warning if you actually used this somewhere.
>
I did run dtbs_check with this property in the DTS and haven't seen
any warning. Also now I included this property in the example node in
the binding doc and seen no warnings reported by dt_binding_check too.

> > +          description: |
> > +            Output impedance for pins on RZ/V2H(P) SoC.
> > +            x1: Corresponds to 0 in IOLH register.
> > +            x2: Corresponds to 1 in IOLH register.
> > +            x4: Corresponds to 2 in IOLH register.
> > +            x6: Corresponds to 3 in IOLH register.
>
> Why not just use 0-3 for the values?
>
Fine by me. I'll update this in the next version.

Cheers,
Prabhakar
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml
index 881e992adca3..77f4fc7f4a21 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
 
 additionalProperties:
   anyOf:
@@ -111,6 +116,15 @@  additionalProperties:
         output-high: true
         output-low: true
         line-name: true
+        renesas-rzv2h,output-impedance:
+          description: |
+            Output impedance for pins on RZ/V2H(P) SoC.
+            x1: Corresponds to 0 in IOLH register.
+            x2: Corresponds to 1 in IOLH register.
+            x4: Corresponds to 2 in IOLH register.
+            x6: Corresponds to 3 in IOLH register.
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [1, 2, 4, 6]
 
     - type: object
       additionalProperties: