linux-kernel - Re: [PATCH 6/8] regulator: max77686: Add external GPIO control

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 03 Nov 2014 13:07:02 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 6/8] regulator: max77686: Add external GPIO control

On pią, 2014-10-31 at 10:32 +0000, Mark Brown wrote:
> On Fri, Oct 31, 2014 at 08:51:38AM +0100, Krzysztof Kozlowski wrote:
> 
> > However new DT style parsing (regulator_of_get_init_data()) does the
> > basic parsing stuff and this removes a lot of code from driver. The
> > driver no longer parses all regulaotrs but the regulator core does it.
> > Unfortunately regulator core does not parse custom bindings (like such
> > GPIOs) so I would have to iterate once again through all regulators just
> > to find "gpios" property.
> 
> We could always add a callback for the driver to handle any custom
> properties...  one of the advantages of an OS like Linux is that we can
> improve the core code.

I thought about this - adding a callback, called on each child in
regulator_of_get_init_data(). However the reason behind this callback is
to parse GPIO and set config.ena_gpio. However in that context the
regulator_config is const so the callback cannot change it. Unless it
casts it to non-const... which isn't what we want I think.

So now I wonder whether adding generic bindings for ena_gpio make sense.
These would look like bindings for fixed-regulator (with "ena-" prefix).
Unfortunately this would duplicate a little the ena_gpio in
regulator_config... but to me it seems more appropriate.

What do you think about adding generic bindings for ena_gpio?

Best regards,
Krzysztof


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/