linux-kernel - Re: [PATCH 431/606] mfd: khadas-mcu: Convert to i2c's .probe

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Message-ID: <20221207110007.yfjfiakmh4ma3sfo@pengutronix.de>
Date:   Wed, 7 Dec 2022 12:00:07 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Lee Jones <lee@...nel.org>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        linux-kernel@...r.kernel.org, Wolfram Sang <wsa@...nel.org>,
        Angel Iglesias <ang.iglesiasg@...il.com>,
        linux-i2c@...r.kernel.org, kernel@...gutronix.de,
        Grant Likely <grant.likely@...aro.org>,
        linux-amlogic@...ts.infradead.org, Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 431/606] mfd: khadas-mcu: Convert to i2c's .probe_new()

Hello Lee,

On Tue, Dec 06, 2022 at 04:56:59PM +0000, Lee Jones wrote:
> > On Tue, Dec 06, 2022 at 04:10:51PM +0000, Lee Jones wrote:
> > > On Tue, 06 Dec 2022, Uwe Kleine-König wrote:
> > > 
> > > > Hey Lee,
> > > > 
> > > > On Mon, Nov 21, 2022 at 04:51:21PM +0000, Lee Jones wrote:
> > > > > On Mon, 21 Nov 2022, Uwe Kleine-König wrote:
> > > > > 
> > > > > > Hello Lee,
> > > > > > 
> > > > > > On Mon, Nov 21, 2022 at 12:32:10PM +0000, Lee Jones wrote:
> > > > > > > On Fri, 18 Nov 2022, Uwe Kleine-König wrote:
> > > > > > > 
> > > > > > > > From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > > > > > > > 
> > > > > > > > The probe function doesn't make use of the i2c_device_id * parameter so it
> > > > > > > > can be trivially converted.
> > > > > > > > 
> > > > > > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > > > > > > > ---
> > > > > > > >  drivers/mfd/khadas-mcu.c | 5 ++---
> > > > > > > >  1 file changed, 2 insertions(+), 3 deletions(-)
> > > > > > > 
> > > > > > > After a week or so, please collect-up all the tags you have received
> > > > > > > and submit a per-subsystem set for me to hoover up, thanks.
> > > > > > 
> > > > > > For mfd I'd do:
> > > > > > 
> > > > > > 	git checkout mfd/for-next
> > > > > > 	b4 am -P 413-481 20221118224540.619276-1-uwe@...ine-koenig.org
> > > > > > 	git am ./20221118_uwe_i2c_complete_conversion_to_i2c_probe_new.mbx
> > > > > > 	git send-email --to .... --cc .... mfd/for-next
> > > > > 
> > > > > That's just crazy enough to work.
> > > > > 
> > > > > Thanks for the tip.
> > > > 
> > > > On irc you said you'd care for application of these patches ("I plan to
> > > > attempt the b4 solution"), they didn't land in next yet. Do you need a
> > > > reminder? Something else?
> > > 
> > > I applied them, but they fail to build and I haven't had time to
> > > investigate.  I guess they depend on some patches that have been
> > > accepted into another (input?) and are now in -next.  Any idea if they
> > > are available on some immutable branch that I can pull from?
> > 
> > If in your tree i2c_client_get_device_id() is missing, you want to pull
> > 
> > 	https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/client_device_id_helper-immutable
> 
> Ideal, thanks.

I see you added my commits to your tree now, however there is a problem:

  $ git log --oneline --graph --boundary linus/master..FETCH_HEAD
  ...
  *   7281458f4396 Merge branches 'ib-i2c-mfd-client_dev_id_helper-6.2' and 'ib-mfd-uwes-i2c-probe_new-6.2' into ibs-for-mfd-merged
  |\  
  | * c066a1632bc3 mfd: wm8994-core: Convert to i2c's .probe_new()
  | * 0f22cf00762d mfd: wm8400-core: Convert to i2c's .probe_new()
  | * 090f49b250ee mfd: wm8350-i2c: Convert to i2c's .probe_new()
  | * 7174af1be41d mfd: wm831x-i2c: Convert to i2c's .probe_new()
  | ...
  | * 63909fec136e mfd: adp5520: Convert to i2c's .probe_new()
  | * 549d4f3207f8 mfd: act8945a: Convert to i2c's .probe_new()
  | * 623f79babaf1 mfd: aat2870-core: Convert to i2c's .probe_new()
  | * ce41e4ae7cac mfd: 88pm805: Convert to i2c's .probe_new()
  | * 02aa483f1f98 mfd: 88pm800: Convert to i2c's .probe_new()
  * | 662233731d66 i2c: core: Introduce i2c_client_get_device_id helper function
  |/
  o 9abf2313adc1 (tag: v6.1-rc1) Linux 6.1-rc1

That means that the commit introducing i2c_client_get_device_id() isn't
an ancestor of the commits that make use of the new function. So
63909fec136e (which is the first commit making use of the new function)
likely won't compile:

	$ git grep i2c_client_get_device_id 63909fec136e
	63909fec136e:drivers/mfd/adp5520.c:     const struct i2c_device_id *id = i2c_client_get_device_id(client);

Starting with 7281458f4396 everything is fine again, but still this
hurts a bisection.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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