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

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Date:   Mon, 2 Jul 2018 08:19:26 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        Marek Vašut <marek.vasut@...il.com>,
        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>
Subject: Re: [PATCH] arm: dts: socfpga: denali needs nand_x_clk too



On 07/01/2018 08:35 PM, Masahiro Yamada wrote:
> Hi Dinh,
> 
> 2018-06-27 23:55 GMT+09:00 Dinh Nguyen <dinguyen@...nel.org>:
>> Hi Masahiro,
>>
>> On 06/26/2018 09:52 PM, Masahiro Yamada wrote:
>>> 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 wasn't aware of these patches. This patch is staged to go into
>> v4.17-rc3 through the arm-soc:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git/commit/arch/arm/boot/dts/socfpga.dtsi?h=fixes&id=4eda9b766b042ea38d84df91581b03f6145a2ab0
>>
>> I think your patch will handle a case where only 1 clock is passed in,
>> so it should be okay right?
>>
> 
> I should be OK,
> but please consider the proper fix for v4.19
> as Boris suggested.
> 

Yes, I will spin up a patch.

Dinh