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 13:19:28 +0000
From:   Naga Sureshkumar Relli <nagasure@...inx.com>
To:     Miquel Raynal <miquel.raynal@...tlin.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 Miquel,

> -----Original Message-----
> From: Miquel Raynal [mailto:miquel.raynal@...tlin.com]
> Sent: Friday, November 9, 2018 6:24 PM
> To: Naga Sureshkumar Relli <nagasure@...inx.com>
> Cc: Boris Brezillon <boris.brezillon@...tlin.com>; richard@....at; dwmw2@...radead.org;
> computersforpeace@...il.com; marek.vasut@...il.com; Michal Simek
> <michals@...inx.com>; linux-mtd@...ts.infradead.org; linux-kernel@...r.kernel.org;
> nagasuresh12@...il.com; 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).
Ok got it. I will update.

Thanks,
Naga Sureshkumar Relli
> 
> > > > +			nand-ecc-mode = "hw";
> > > > +		};
> > > > +	};
> >
> 
> 
> Thanks,
> Miquèl