From: Pankaj Dubey <pankaj.dubey@samsung.com>
To: "'Boris BREZILLON'" <boris.brezillon@free-electrons.com>,
"'Arnd Bergmann'" <arnd@arndb.de>
Cc: kgene.kim@samsung.com, linux@arm.linux.org.uk,
"'Alexander Shiyan'" <shc_work@mail.ru>,
naushad@samsung.com, "'Tomasz Figa'" <t.figa@samsung.com>,
linux-kernel@vger.kernel.org, joshi@samsung.com,
linux-samsung-soc@vger.kernel.org, thomas.ab@samsung.com,
tomasz.figa@gmail.com, vikas.sajjan@samsung.com,
chow.kim@samsung.com, lee.jones@linaro.org,
"'Michal Simek'" <michal.simek@xilinx.com>,
linux-arm-kernel@lists.infradead.org,
"'Mark Brown'" <broonie@kernel.org>
Subject: RE: [PATCH v2] mfd: syscon: Decouple syscon interface from platform devices
Date: Thu, 04 Sep 2014 10:15:27 +0530 [thread overview]
Message-ID: <002701cfc7fb$110a7350$331f59f0$@samsung.com> (raw)
In-Reply-To: <20140903161528.05f566e1@bbrezillon>
Hi Boris,
On Wednesday, September 03, 2014 Boris BREZILLON wrote,
> To: Arnd Bergmann
> Cc: Pankaj Dubey; kgene.kim@samsung.com; linux@arm.linux.org.uk; Alexander
> Shiyan; naushad@samsung.com; Tomasz Figa; linux-kernel@vger.kernel.org;
> joshi@samsung.com; linux-samsung-soc@vger.kernel.org;
thomas.ab@samsung.com;
> tomasz.figa@gmail.com; vikas.sajjan@samsung.com; chow.kim@samsung.com;
> lee.jones@linaro.org; Michal Simek; linux-arm-kernel@lists.infradead.org;
Mark
> Brown
> Subject: Re: [PATCH v2] mfd: syscon: Decouple syscon interface from
platform
> devices
>
> On Wed, 03 Sep 2014 15:49:04 +0200
> Arnd Bergmann <arnd@arndb.de> wrote:
>
> > On Wednesday 03 September 2014 15:16:11 Boris BREZILLON wrote:
> > > I checked that part, and it appears most of the code is already
> > > there (see usage of regmap_attach_dev function here [1]).
> > >
> > > The only problem I see is that errors are still printed with
> > > dev_err, which, AFAIK, will trigger a kernel panic if dev is NULL.
> >
> > Actually not:
> >
> > static int __dev_printk(const char *level, const struct device *dev,
> > struct va_format *vaf) {
> > if (!dev)
> > return printk("%s(NULL device *): %pV", level, vaf);
> >
> > return dev_printk_emit(level[1] - '0', dev,
> > "%s %s: %pV",
> > dev_driver_string(dev), dev_name(dev),
> > vaf); }
> >
>
> My bad then (I don't know where I looked at to think NULL dev was not
gracefully
> handled :-)). Thanks for pointing this out.
> Given that, I think it should work fine even with a NULL dev.
> I'll give it a try on at91 ;-).
>
We have tested this patch, on Exynos board and found working well.
In our use case DT based drivers such as USB Phy, SATA Phy, Watchdog are
calling
syscon_regmap_lookup_by APIs to get regmap handle to Exynos PMU and it
worked
well for these drivers.
It would be great if after testing you share result here or give a
Tested-By.
Thanks,
Pankaj Dubey
> Best Regards,
>
> Boris
>
> --
> Boris Brezillon, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com
next prev parent reply other threads:[~2014-09-04 4:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-02 14:42 [PATCH v2] mfd: syscon: Decouple syscon interface from platform devices Pankaj Dubey
2014-09-02 14:50 ` Tomasz Figa
2014-09-02 15:20 ` Arnd Bergmann
2014-09-02 15:42 ` Alexander Shiyan
2014-09-02 17:40 ` Arnd Bergmann
2014-09-03 13:16 ` Boris BREZILLON
2014-09-03 13:49 ` Arnd Bergmann
2014-09-03 14:15 ` Boris BREZILLON
2014-09-04 4:45 ` Pankaj Dubey [this message]
2014-09-04 6:03 ` Boris BREZILLON
2014-09-05 8:14 ` Boris BREZILLON
2014-09-16 11:53 ` Pankaj Dubey
2014-09-16 14:52 ` Arnd Bergmann
2014-09-04 4:39 ` Pankaj Dubey
2014-09-04 4:52 ` Alexander Shiyan
2014-09-03 3:44 ` Vivek Gautam
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