linux-kernel - Re: [PATCH] arm: dts: socfpga: denali needs nand_x_clk too

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Date:   Wed, 27 Jun 2018 11:52:22 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Richard Weinberger <richard@....at>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Vašut <marek.vasut@...il.com>
Subject: Re: [PATCH] arm: dts: socfpga: denali needs nand_x_clk too

2018-06-27 3:09 GMT+09:00 Miquel Raynal <miquel.raynal@...tlin.com>:
> Hi Masahiro,
>
> On Tue, 26 Jun 2018 11:38:21 +0900, Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
>
>> 2018-06-25 23:55 GMT+09:00 Boris Brezillon <boris.brezillon@...tlin.com>:
>> > On Mon, 25 Jun 2018 09:50:18 -0500
>> > Dinh Nguyen <dinguyen@...nel.org> wrote:
>> >
>> >> On 06/22/2018 10:58 AM, Richard Weinberger wrote:
>> >> > Masahiro,
>> >> >
>> >> > Am Freitag, 22. Juni 2018, 16:37:21 CEST schrieb Masahiro Yamada:
>> >> >> Hi Richard,
>> >> >>
>> >> >>
>> >> >> 2018-06-19 21:07 GMT+09:00 Richard Weinberger <richard@....at>:
>> >> >>> The denali NAND flash controller needs at least two clocks to operate,
>> >> >>> nand_clk and nand_x_clk.
>> >> >>> Since 1bb88666775e ("mtd: nand: denali: handle timing parameters by
>> >> >>> setup_data_interface()") nand_x_clk is used to derive timing settings.
>> >> >>>
>> >> >>> Signed-off-by: Richard Weinberger <richard@....at>
>> >> >>> ---
>> >> >>> Strictly speaking denali needs a ecc_clk too, but AFAIK such a clock
>> >> >>> is not present on this SoC.
>> >> >>> But my SoCFPGA knowledge is very limited.
>> >> >>>
>> >> >>> Thanks,
>> >> >>> //richard
>> >> >>> ---
>> >> >>>  arch/arm/boot/dts/socfpga.dtsi | 3 ++-
>> >> >>>  1 file changed, 2 insertions(+), 1 deletion(-)
>> >> >>>
>> >> >>> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
>> >> >>> index 486d4e7433ed..562f7b375bbd 100644
>> >> >>> --- a/arch/arm/boot/dts/socfpga.dtsi
>> >> >>> +++ b/arch/arm/boot/dts/socfpga.dtsi
>> >> >>> @@ -754,7 +754,8 @@
>> >> >>>                         reg-names = "nand_data", "denali_reg";
>> >> >>>                         interrupts = <0x0 0x90 0x4>;
>> >> >>>                         dma-mask = <0xffffffff>;
>> >> >>> -                       clocks = <&nand_clk>;
>> >> >>> +                       clocks = <&nand_clk>, <&nand_x_clk>;
>> >> >>> +                       clock-names = "nand", "nand_x";
>> >> >>
>> >> >>
>> >> >> IMHO, this should be
>> >> >>
>> >> >>                           clocks = <&nand_clk>, <&nand_x_clk>, <&nand_x_clk>;
>> >> >>                           clock-names = "nand", "nand_x", "ecc";
>> >>
>> >> No, it should be just the nand_x and ecc.
>> >>
>> >> There's already a patch to use the nand_x_clk and not the nand_clk.
>>
>>
>> Different people try to fix the problem in different ways.
>>
>> I think it is due to miscommunication across sub-systems.
>
> Is the series named
>
>         mtd: rawnand: denali: add new clocks and improve
>                               setup_data_interface
>
> still valid?

Yes.
I believe V4 is valid.

Information for Dinh Nguyen:

http://patchwork.ozlabs.org/patch/933507/
http://patchwork.ozlabs.org/patch/933487/
http://patchwork.ozlabs.org/patch/933494/
http://patchwork.ozlabs.org/patch/933506/

If he is not convinced, I am open to discussion, though.

> I am about to apply it (patches 2/5 to 5/5) but it looks like the
> discussion is still ongoing.
>
> Thanks,
> Miquèl
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

-- 
Best Regards
Masahiro Yamada

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