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

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Date:   Fri, 16 Nov 2018 15:22:35 +0100
From:   Martin Lund <martin.lund@...p-it-simple.com>
To:     nagasure@...inx.com
Cc:     michals@...inx.com, Martin Lund <martin.lund@...p-it-simple.com>,
        naga sureshkumar <nagasuresh12@...il.com>,
        boris.brezillon@...tlin.com, richard@....at,
        linux-kernel@...r.kernel.org,
        Marek Vašut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org, miquel.raynal@...tlin.com,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>, robh@...nel.org
Subject: Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree
 binding documentation

Yes, the clk_ prefix is kind of unnecessary. Though, all the
clock-names in zynqmp.dtsi are still using the prefix - hopefully that
will eventually be cleaned out.

Either way, we just need to make sure the device tree doc clock-names
are consistent with whatever is used by the driver.

Br, Martin
On Fri, Nov 16, 2018 at 2:50 PM Naga Sureshkumar Relli
<nagasure@...inx.com> wrote:
>
> Hi,
>
> > -----Original Message-----
> > From: Michal Simek [mailto:michal.simek@...inx.com]
> > Sent: Friday, November 16, 2018 6:04 PM
> > To: Martin Lund <martin.lund@...p-it-simple.com>; Naga Sureshkumar Relli
> > <nagasure@...inx.com>
> > Cc: boris.brezillon@...tlin.com; miquel.raynal@...tlin.com; richard@....at; David
> > Woodhouse <dwmw2@...radead.org>; Brian Norris <computersforpeace@...il.com>; Marek
> > Vašut <marek.vasut@...il.com>; naga sureshkumar <nagasuresh12@...il.com>; linux-
> > mtd@...ts.infradead.org; linux-kernel@...r.kernel.org; robh@...nel.org
> > Subject: Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree binding
> > documentation
> >
> > On 16. 11. 18 12:50, Martin Lund wrote:
> > > Hi Naga,
> > >
> > > I've been working on running up the latest kernel (v4.20-rc2) on our
> > > custom Xilinx hw board so that I can test the v12 version of your
> > > Arasan nand driver.
> > >
> > > I've managed to get the driver successfully up and running and ready
> > > for testing with a Micron MT29F64G08AFAAAWP device. However, setting
> > > it up I've found a few inaccuracies in the documentation of the device
> > > tree bindings.
> > >
> > > This is the device configuration that ended up working for me with
> > > linux v4.20-rc2:
> > >
> > >        nfc: nand@...00000 {
> > >             compatible = "xlnx,zynqmp-nand", "arasan,nfc-v3p10";
> > >             reg = <0x0 0xff100000 0x0 0x1000>;
> > >             clock-names = "clk_sys", "clk_flash";
> > >             clocks = <&clk200>, <&clk100>;
> > >             interrupt-parent = <&gic>;
> > >             interrupts = <0 14 4>;
> > >             #address-cells = <1>;
> > >             #size-cells = <0>;
> > >
> > >             nand@0 {
> > >                 reg = <0>;
> > >                 nand-ecc-mode = "hw";
> > >             };
> > >         };
> > >
> > > Compared with the example you will notice that "clock-name" should be
> > > "clock-names". reg was missing a "0x0".
> >
> > clock-names and even that names - you are right it is not correct and should be fixed.
> Clock-names I will change from "clock-name" to "clock-names".
> But I got some review comments previously, to use "sys" instead of  "clk_sys" and "flash" instead of "clk_flash".
> And I have to change this in driver.
> I will update that.
>
> Thanks,
> Naga Sureshkumar Relli
>
> >
> > Missing 0x0 in reg doesn't matter because it depends on address/size cells.
> >
> > > I think it is helpful to provide a real-world working example, so you
> > > might also consider changing the example "clocks" configuration to
> > > clk200/clk100 since there is no clk_misc among the clock sources of
> > > any of the xilinx zynqmp board device tree configurations.
> >
> > Real example is the best normally just c&p from existing dts is the way to go.
> > But in connection to clocks it doesn't matter what exactly should be there and I don't think
> > there is any consistency in that. Hopefully this will be removed by yaml conversion.
> >
> > Thanks,
> > Michal
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

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