linux-kernel - Re: [PATCH v2 0/3] mtd: rawnand: denali: add new clocks and improve setup_data

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Message-ID: <CAK7LNASoV9nHTFax1nD_8pvkEjTzXkFpDFRf_xuoOnPPf9K23A@mail.gmail.com>
Date:   Thu, 14 Jun 2018 16:29:59 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Richard Weinberger <richard@...ma-star.at>
Cc:     linux-mtd <linux-mtd@...ts.infradead.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Philipp Rosenberger <p.rosenberger@...utronix.de>,
        Rob Herring <robh@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 0/3] mtd: rawnand: denali: add new clocks and improve setup_data_interface

Hi Richard,

2018-06-14 16:25 GMT+09:00 Richard Weinberger <richard@...ma-star.at>:
> Masahiro,
>
> Am Donnerstag, 14. Juni 2018, 07:11:04 CEST schrieb Masahiro Yamada:
>>
>> The ->setup_data_interface() hook needs to know the clock frequency.
>> In fact, this IP needs three clocks, bus "which clock?" is really
>> confusing.  (It is not described in the DT-binding at all.)
>>
>> This series adds more clocks.  In the new binding, three clocks
>> are required: core clock, bus interface clock, ECC engine clock.
>>
>> This series also takes care of the backward compatibility by
>> providing hardcoded values in case the new clocks are missing.
>> So, existing DT should work.
>>
>>
>> Changes in v2:
>>   - Split patches into sensible chunks
>>
>> Masahiro Yamada (3):
>>   mtd: rawnand: denali_dt: use dev as a shorthand of &pdev->dev
>>   mtd: rawnand: denali_dt: add more clocks based on IP datasheet
>>   mtd: rawnand: denali: optimize timing parameters for data interface
>
> This still means that we need to feed at least 2/3 and 3/3 into -stable to
> unbreak the driver.


3/3 is not mandatory.

You can only back-port 1/3 and 2/3.


3/3 is an optimization.
It will make the device access a little faster,
but you do not have to take it if you do not want to.




> I'd really prefer a single self-hosting fix that can go into -stable and then
> patches on top of the fix can prettify the driver.
>
> Thanks,
> //richard
>
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-- 
Best Regards
Masahiro Yamada