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

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Date:   Tue, 26 Jun 2018 20:09:28 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Richard Weinberger <richard@....at>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marek Vašut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] arm: dts: socfpga: denali needs nand_x_clk too

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?

I am about to apply it (patches 2/5 to 5/5) but it looks like the
discussion is still ongoing.

Thanks,
Miquèl