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

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Message-ID: <20180614100339.02f1ee04@bbrezillon>
Date:   Thu, 14 Jun 2018 10:03:39 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Richard Weinberger <richard@...ma-star.at>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        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

On Thu, 14 Jun 2018 10:02:12 +0200
Richard Weinberger <richard@...ma-star.at> wrote:

> Am Donnerstag, 14. Juni 2018, 09:38:35 CEST schrieb Boris Brezillon:
> > On Thu, 14 Jun 2018 16:29:59 +0900
> > Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:
> >   
> > > 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.  
> > 
> > Well, patch 1 is not a fix, can we move it after patch 2 so that only
> > patch 2 is flagged with the Fixes+Cc-stable tags?  
> 
> Another question, shall we fix arch/arm/boot/dts/socfpga.dtsi too?

Yep.