linux-kernel - Re: [PATCH v3 1/3] nvmem: Update the OF binding to use a subnode for the cells list

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Message-ID: <8c4b48ad-e99e-030a-a4ee-b6df0fa59c79@linaro.org>
Date:   Tue, 17 Apr 2018 16:44:01 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Alban <albeu@...e.fr>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] nvmem: Update the OF binding to use a subnode for
 the cells list

Thanks for explaining,

On 17/04/18 15:54, Alban wrote:
> This will not only allow reading the calibration data from nvmem, but
> will also create a partition on the MTD device, which is not acceptable.
> With my proposed binding this would become:
> 
> flash@0 {
> 	#address-cells = <1>;
> 	#size-cells = <1>;
> 	compatible = "s25sl064a";
> 	reg = <0>;
> 
> 	nvmem-cells {
> 		compatible = "nvmem-cells";
> 		#address-cells = <1>;
> 		#address-cells = <1>;
> 
> 		calibration: calib@404 {
> 			reg = <0x404 0x10>;
> 		};
> 	};

Why can't we make nvmem-cells node a nvmem provider in this case?
Which should work!

--srini


> };
> 
> Which would work fine as the MTD code will ignore the nvmem-cells
> subnode thanks to its compatible string.