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From: Boris Brezillon <>
To: Sekhar Nori <>
Cc: David Lechner <>,
	Bartosz Golaszewski <>,
	Richard Weinberger <>,, Marek Vasut <>,,
	Cyrille Pitchen <>,
	Brian Norris <>,
	David Woodhouse <>,
	Linux ARM Mailing List <>
Subject: Re: [PATCH] mtd: nand: davinci: don't acquire and enable clock
Date: Thu, 26 Apr 2018 20:01:08 +0200	[thread overview]
Message-ID: <20180426200108.2afb375c@bbrezillon> (raw)
In-Reply-To: <>

Hi Sekhar,

On Fri, 30 Mar 2018 20:00:51 +0530
Sekhar Nori <> 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 <>
> ---
> Hi Boris,
> If/when this patch gets accepted, 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.

I prepared the nand/davinci-clock tag for you to fetch if needed. I'll
merge it into the nand/next branch soon.



The following changes since commit 60cc43fc888428bb2f18f08997432d426a243338:

  Linux 4.17-rc1 (2018-04-15 18:24:20 -0700)

are available in the git repository at:

  git:// tags/nand/davinci-clock

for you to fetch changes up to a8e3923ab57192547ffad01d78939c5c0d5d0c30:

  mtd: rawnand: davinci: don't acquire and enable clock (2018-04-26 19:55:40 +0200)

Prepare things for davinci clk driver cleanup

Sekhar Nori (1):
      mtd: rawnand: davinci: don't acquire and enable clock

 drivers/mtd/nand/raw/davinci_nand.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

      parent reply	other threads:[~2018-04-26 18:01 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-30 14:30 Sekhar Nori
2018-04-02  7:01 ` Boris Brezillon
2018-04-02  7:03 ` Boris Brezillon
2018-04-25  8:53 ` Bartosz Golaszewski
2018-04-26 18:01 ` Boris Brezillon [this message]

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