linux-kernel - Re: [PATCH RESEND v3 1/3] dt-bindings: net: add reset property for aspeed, ast2600-mdio binding

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Message-Id: <41242dce-15e6-471e-bb44-bf8659175045@www.fastmail.com>
Date:   Mon, 11 Apr 2022 09:45:23 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Dylan Hung" <dylan_hung@...eedtech.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....id.au>, "Andrew Lunn" <andrew@...n.ch>,
        "Heiner Kallweit" <hkallweit1@...il.com>,
        "Russell King" <linux@...linux.org.uk>,
        "David Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>, pabeni@...hat.com,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        netdev <netdev@...r.kernel.org>
Cc:     BMC-SW@...eedtech.com, "Krzysztof Kozlowski" <krzk@...nel.org>
Subject: Re: [PATCH RESEND v3 1/3] dt-bindings: net: add reset property for aspeed,
 ast2600-mdio binding

Hi Dylan,

On Thu, 7 Apr 2022, at 17:27, Dylan Hung wrote:
> The AST2600 MDIO bus controller has a reset control bit and must be
> deasserted before manipulating the MDIO controller. By default, the
> hardware asserts the reset so the driver only need to deassert it.
>
> Regarding to the old DT blobs which don't have reset property in them,
> the reset deassertion is usually done by the bootloader so the reset
> property is optional to work with them.
>
> Signed-off-by: Dylan Hung <dylan_hung@...eedtech.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../devicetree/bindings/net/aspeed,ast2600-mdio.yaml         | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git 
> a/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml 
> b/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
> index 1c88820cbcdf..7f43b4fe86a3 100644
> --- a/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
> +++ b/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
> @@ -20,10 +20,14 @@ allOf:
>  properties:
>    compatible:
>      const: aspeed,ast2600-mdio
> +
>    reg:
>      maxItems: 1
>      description: The register range of the MDIO controller instance
> 
> +  resets:
> +    maxItems: 1
> +
>  required:
>    - compatible
>    - reg
> @@ -39,6 +43,7 @@ examples:
>              reg = <0x1e650000 0x8>;
>              #address-cells = <1>;
>              #size-cells = <0>;
> +            resets = <&syscon 35>;

This is just the example but we should probably have it do the 
canonical thing and use ASPEED_RESET_MII from 
include/dt-bindings/clock/ast2600-clock.h

Andrew