linux-kernel - Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree binding documentation

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Date:   Fri, 9 Nov 2018 13:54:05 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Naga Sureshkumar Relli <nagasure@...inx.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        "richard@....at" <richard@....at>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        Michal Simek <michals@...inx.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nagasuresh12@...il.com" <nagasuresh12@...il.com>,
        "robh@...nel.org" <robh@...nel.org>
Subject: Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree
 binding documentation

Hi Naga,

[...]

> > > diff --git a/Documentation/devicetree/bindings/mtd/arasan_nand.txt
> > > b/Documentation/devicetree/bindings/mtd/arasan_nand.txt
> > > new file mode 100644
> > > index 0000000..b522daf
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mtd/arasan_nand.txt
> > > @@ -0,0 +1,32 @@
> > > +Arasan NAND Flash Controller with ONFI 3.1 support
> > > +
> > > +Required properties:
> > > +- compatible:		Should be "xlnx,zynqmp-nand", "arasan,nfc-v3p10"
> > > +- reg:			Memory map for module access
> > > +- interrupts:		Should contain the interrupt for the device
> > > +- clock-name:		List of input clocks - "sys", "flash"
> > > +			(See clock bindings for details)
> > > +- clocks:		Clock phandles (see clock bindings for details)
> > > +
> > > +Required properties for child node:
> > > +- nand-ecc-mode: see nand.txt  
> > 
> > Why is it required? Can't you fallback to HW when this prop is missing?  
> Yes, we can.
> Do you want me to update that in driver now? 
> Looks like you have some comments in driver as well, so while addressing those I will update the code to fallback to HW ECC when 
> It is missing.

Yes, please.

> 
> > Oh, and reg is not listed in the required props.  
> Which reg?
> I already mention this " reg:	Memory map for module access " in required properties.
> 
> Thanks,
> Naga Sureshkumar Relli
> >   
> > > +
> > > +For NAND partition information please refer the below file
> > > +Documentation/devicetree/bindings/mtd/partition.txt
> > > +
> > > +Example:
> > > +	nfc: nand@...00000 {
> > > +		compatible = "xlnx,zynqmp-nand", "arasan,nfc-v3p10";
> > > +		reg = <0x0 0xff100000 0x1000>;
> > > +		clock-name = "sys", "flash";
> > > +		clocks = <&misc_clk &misc_clk>;
> > > +		interrupt-parent = <&gic>;
> > > +		interrupts = <0 14 4>;
> > > +		#address-cells = <1>;
> > > +		#size-cells = <0>;
> > > +
> > > +		nand@0 {
> > > +			reg = <0>;

This one, for the CS line(s).

> > > +			nand-ecc-mode = "hw";
> > > +		};
> > > +	};  
> 


Thanks,
Miquèl