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 12:33:56 +0000
From:   Naga Sureshkumar Relli <nagasure@...inx.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     "miquel.raynal@...tlin.com" <miquel.raynal@...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 Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Friday, November 9, 2018 11:59 AM
> To: Naga Sureshkumar Relli <nagasure@...inx.com>
> Cc: miquel.raynal@...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
> 
> On Fri, 9 Nov 2018 10:30:39 +0530
> Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com> wrote:
> 
> > This patch adds the dts binding document for arasan nand flash
> > controller
> >
> > Signed-off-by: Naga Sureshkumar Relli
> > <naga.sureshkumar.relli@...inx.com>
> > ---
> > Changes in v12:
> >  - Removed interrupt-parent description as it is implied as suggested by
> >    Rob Herring
> >  - Added missing ';' as required
> > Changes in v11:
> >  - Updated compatible description as suggested by Boris
> >  - Removed arasan-has-dma property
> > Changes in v10:
> >  - None
> > Changes in v9:
> >  - None
> > Changes in v8:
> >  - Updated compatible and clock-names as per Boris comments Changes in
> > v7:
> >  - Corrected the acronyms those should be in caps Changes in v6:
> >  - Removed num-cs property
> >  - Separated nandchip from nand controller Changes in v5:
> >  - None
> > Changes in v4:
> >  - Added num-cs property
> >  - Added clock support
> > Changes in v3:
> >  - None
> > Changes in v2:
> >  - None
> > ---
> >  .../devicetree/bindings/mtd/arasan_nand.txt        | 32 ++++++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/mtd/arasan_nand.txt
> >
> > 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.

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