linux-kernel - Re: [PATCH 2/3] dt-bindings: pinctrl: rockchip: Add io domain properties

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Message-ID: <20230905181402.GA3673113-robh@kernel.org>
Date:   Tue, 5 Sep 2023 13:14:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-rockchip@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
        kernel@...gutronix.de,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH 2/3] dt-bindings: pinctrl: rockchip: Add io domain
 properties

On Mon, Sep 04, 2023 at 01:58:15PM +0200, Sascha Hauer wrote:
> Add rockchip,io-domains property to the Rockchip pinctrl driver. This
> list of phandles points to the IO domain device(s) the pins of the
> pinctrl driver are supplied from.

Is there an actual need for multiple IO devices with multiple pinctrl 
blocks? If not, you don't need a property, just lookup the IO domain 
node by compatible.

> 
> Also a rockchip,io-domain-boot-on property is added to pin groups
> which can be used for pin groups which themselves are needed to access
> the regulators an IO domain is driven from.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  .../bindings/pinctrl/rockchip,pinctrl.yaml          | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.yaml
> index 10c335efe619e..92075419d29cf 100644
> --- a/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.yaml
> @@ -62,6 +62,11 @@ properties:
>        Required for at least rk3188 and rk3288. On the rk3368 this should
>        point to the PMUGRF syscon.
>  
> +  rockchip,io-domains:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      Phandles to io domains
> +
>    "#address-cells":
>      enum: [1, 2]
>  
> @@ -137,7 +142,13 @@ additionalProperties:
>              - description:
>                  The phandle of a node contains the generic pinconfig options
>                  to use as described in pinctrl-bindings.txt.
> -
> +      rockchip,io-domain-boot-on:
> +        type: boolean
> +        description:
> +          If true assume that the io domain needed for this pin group has been
> +          configured correctly by the bootloader. This is needed to break cyclic
> +          dependencies introduced when a io domain needs a regulator that can be
> +          accessed through pins configured here.
>  examples:
>    - |
>      #include <dt-bindings/interrupt-controller/arm-gic.h>
> -- 
> 2.39.2
>