linux-kernel - Re: [PATCH] mtd: nand: davinci: don't acquire and enable clock

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Date:   Mon, 2 Apr 2018 09:01:00 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Sekhar Nori <nsekhar@...com>
Cc:     David Lechner <david@...hnology.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mtd: nand: davinci: don't acquire and enable clock

On Fri, 30 Mar 2018 20:00:51 +0530
Sekhar Nori <nsekhar@...com> wrote:

> NAND itself is an asynchronous interface, it does not have any
> clock input. DaVinci NAND driver acquires clock for AEMIF
> (asynchronous external memory interface) which is an on-chip
> IP to which NAND is connected.
> 
> The same clock is also enabled in AEMIF driver (either present
> drivers/memory or from machine code for some older platforms).
> AEMIF timing must be initialized before NAND can be accessed.
> This ensures that AEMIF clock is enabled too.
> 
> Remove the superfluous clock acquisition and enable in DaVinci
> NAND driver.
> 
> Tested on K2L, K2HK, K2E, DA850 EVM, DA850 LCDK in device-tree
> boot and DM644x EVM in legacy boot.
> 
> Signed-off-by: Sekhar Nori <nsekhar@...com>
> ---
> Hi Boris,
> 
> If/when this patch gets accepted,

I'll probably queue it just after v4.17-rc1 is out if nobody complains
about the change.

> it will nice to put this on
> an immutable branch others can merge. There is potential cleanup
> in drivers/clock and in DaVinci machine code that will depend
> on this.

Sure, I can do that. 

-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com