linux-kernel - Re: [PATCH v5 02/10] dt-bindings: aspeed-sgpio: Add ast2600 sgpio compatibles.

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Date:   Thu, 10 Jun 2021 11:23:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Steven Lee <steven_lee@...eedtech.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>, Hongweiz@....com,
        ryan_chen@...eedtech.com, billy_tsai@...eedtech.com
Subject: Re: [PATCH v5 02/10] dt-bindings: aspeed-sgpio: Add ast2600 sgpio
 compatibles.

On Tue, Jun 08, 2021 at 06:25:37PM +0800, Steven Lee wrote:
> AST2600 SoC has 2 SGPIO master interfaces one with 128 pins another one
> with 80 pins. Add ast2600-sgpiom0-80 and ast2600-sgpiom-128 compatibles
> and update descriptions to introduce the max number of available gpio
> pins that AST2600 supported.
> 
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> Reviewed-by: Andrew Jeffery <andrew@...id.au>
> ---
>  Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
> index b2ae211411ff..0e42eded3c1e 100644
> --- a/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
> +++ b/Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
> @@ -10,9 +10,10 @@ maintainers:
>    - Andrew Jeffery <andrew@...id.au>
>  
>  description:
> -  This SGPIO controller is for ASPEED AST2500 SoC, it supports up to 80 full
> -  featured Serial GPIOs. Each of the Serial GPIO pins can be programmed to
> -  support the following options
> +  This SGPIO controller is for ASPEED AST2400, AST2500 and AST2600 SoC,
> +  AST2600 have two sgpio master one with 128 pins another one with 80 pins,
> +  AST2500/AST2400 have one sgpio master with 80 pins. Each of the Serial
> +  GPIO pins can be programmed to support the following options
>    - Support interrupt option for each input port and various interrupt
>      sensitivity option (level-high, level-low, edge-high, edge-low)
>    - Support reset tolerance option for each output port
> @@ -25,6 +26,8 @@ properties:
>      enum:
>        - aspeed,ast2400-sgpio
>        - aspeed,ast2500-sgpio
> +      - aspeed,ast2600-sgpiom-80
> +      - aspeed,ast2600-sgpiom-128

If the number of GPIOs is the only difference, then I don't think you 
should get rid of ngpios. It's one thing if it varies from one SoC to 
the next, but if something is per instance we should have a property.

Rob