linux-kernel - Re: [PATCH v2 v2 1/3] dt-bindings: i2c: extend existing opencore bindings.

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Message-ID: <20190513205615.GA5844@bogus>
Date:   Mon, 13 May 2019 15:56:15 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sagar Shrikant Kadam <sagar.kadam@...ive.com>
Cc:     mark.rutland@....com, peter@...sgaard.com, andrew@...n.ch,
        palmer@...ive.com, paul.walmsley@...ive.com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 v2 1/3] dt-bindings: i2c: extend existing opencore
 bindings.

On Tue, May 07, 2019 at 08:45:06PM +0530, Sagar Shrikant Kadam wrote:
> Add FU540-C000 specific device tree bindings to already
> available i2-ocores file. This device is available on
> HiFive Unleashed Rev A00 board.
> 
> Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@...ive.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-ocores.txt | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> index 17bef9a..f6bcf90 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> @@ -2,6 +2,7 @@ Device tree configuration for i2c-ocores
>  
>  Required properties:
>  - compatible      : "opencores,i2c-ocores" or "aeroflexgaisler,i2cmst"
> +                    "sifive,fu540-c000-i2c" or "sifive,i2c0"

If this is Opencores IP, does it really follow the Sifive versioning 
convention? If so, please reference sifive-blocks-ip-versioning.txt 
(which appears to have missed going upstream). Also, referencing the IP 
repository would be good too. If this IP block doesn't follow the same 
convention, then don't try using it for this binding.

>  - reg             : bus address start and address range size of device
>  - interrupts      : interrupt number
>  - clocks          : handle to the controller clock; see the note below.
> @@ -67,3 +68,22 @@ or
>  			reg = <0x60>;
>  		};
>  	};
> +or

Just a new compatible isn't really a reason to add an example.

> +	/*
> +	  An Opencore based I2C node in FU540-C000 chip from SiFive
> +	  This chip has a hardware erratum for broken IRQ
> +	  so it's recommended not to define interrupt in the device node

Then interrupts needs to be optional.

> +	*/
> +	i2c@...30000 {
> +			compatible = "sifive,i2c0","sifive,fu540-c000-i2c";
> +			reg = <0x0 0x10030000 0x0 0x1000>;
> +			reg-names = "i2c-control";

Not doucmented.

> +			clocks = <&tlclk>;
> +			clock-frequency = <100000>;
> +
> +			reg-shift = <2>;
> +			reg-io-width = <1>;
> +
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +	};
> -- 
> 1.9.1
> 
> 
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