From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v4 03/10] pwm: Add device tree support
Date: Thu, 15 Mar 2012 12:44:37 +0000 [thread overview]
Message-ID: <201203151244.37483.arnd@arndb.de> (raw)
In-Reply-To: <20120315102944.GB3138@opensource.wolfsonmicro.com>
On Thursday 15 March 2012, Mark Brown wrote:
> Similar code is going in for regulators in 3.4 along with the core
> -EPROBE_DEFER change (though not OF specific) and I sent a similar patch
> for GPIOs too, hopefully Grant will ack it in time for it to make it in.
>
> My theory is that since you need to explicitly know that the thing
> you're requesting is there in order to request it (eg, have a PWM number
> or DT link) the overwhemlingly common case for a failure to request will
> be that the provider didn't register yet which is exactly the case where
> deferral is desired. It therefore seems sensible to have the framework
> default the drivers to retrying rather than have almost every individual
> driver look at the failure, figure out if it was a missing provider, and
> then retry. Drivers that have a good reason to fail can always check
> for -EPROBE_DEFER and override it.
>
> The result should be that we can take advantage of probe deferral over
> large areas of the kernel without having to go and explicitly modify so
> many drivers - if the frameworks like GPIO, clk and regulator can do
> this that ought to cover 90% of the cases where probe deferral will be
> needed without having to do anything more than have good error handling
> paths on probe which is a good idea anyway.
Ok, makes sense.
Thanks,
Arnd
next prev parent reply other threads:[~2012-03-15 12:44 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 15:56 [PATCH v4 00/10] Add PWM framework and device tree support Thierry Reding
2012-03-14 15:56 ` [PATCH v4 01/10] PWM: add pwm framework support Thierry Reding
2012-03-14 20:52 ` Lars-Peter Clausen
2012-03-14 20:57 ` Thierry Reding
2012-03-16 7:19 ` Shawn Guo
2012-03-16 7:28 ` Thierry Reding
2012-03-20 1:55 ` Stephen Warren
2012-03-20 5:59 ` Thierry Reding
2012-03-14 15:56 ` [PATCH v4 02/10] pwm: Allow chips to support multiple PWMs Thierry Reding
2012-03-14 20:42 ` H Hartley Sweeten
2012-03-14 20:49 ` Thierry Reding
2012-03-15 0:42 ` H Hartley Sweeten
2012-03-14 15:56 ` [PATCH v4 03/10] pwm: Add device tree support Thierry Reding
2012-03-14 20:11 ` Sascha Hauer
2012-03-14 20:46 ` Thierry Reding
2012-03-15 8:40 ` Arnd Bergmann
2012-03-15 10:29 ` Mark Brown
2012-03-15 12:44 ` Arnd Bergmann [this message]
2012-03-20 2:12 ` Stephen Warren
2012-03-20 5:51 ` Thierry Reding
2012-03-14 15:56 ` [PATCH v4 04/10] ARM: tegra: Fix PWM clock programming Thierry Reding
2012-03-20 2:15 ` Stephen Warren
2012-03-14 15:56 ` [PATCH v4 05/10] ARM: tegra: Provide clock for only one PWM controller Thierry Reding
2012-03-20 2:18 ` Stephen Warren
2012-03-20 8:44 ` Thierry Reding
2012-03-20 15:27 ` Stephen Warren
2012-03-14 15:56 ` [PATCH v4 06/10] pwm: Add NVIDIA Tegra SoC support Thierry Reding
2012-03-16 8:00 ` Shawn Guo
2012-03-16 8:21 ` Thierry Reding
2012-03-20 2:35 ` Stephen Warren
2012-03-14 15:56 ` [PATCH v4 07/10] pwm: tegra: Add device tree support Thierry Reding
2012-03-20 2:42 ` Stephen Warren
2012-03-20 8:48 ` Thierry Reding
2012-03-20 15:33 ` Stephen Warren
2012-03-20 15:44 ` Thierry Reding
2012-04-04 7:04 ` Shawn Guo
2012-04-04 18:33 ` Stephen Warren
2012-03-14 15:56 ` [PATCH v4 08/10] pwm: Add Blackfin support Thierry Reding
2012-03-14 15:56 ` [PATCH v4 09/10] pwm: Add PXA support Thierry Reding
2012-03-15 0:13 ` Ryan Mallon
2012-03-15 6:56 ` Thierry Reding
2012-03-15 9:05 ` Sascha Hauer
2012-03-15 9:21 ` Thierry Reding
2012-03-15 9:45 ` Sascha Hauer
2012-03-16 8:12 ` Shawn Guo
2012-03-16 8:29 ` Thierry Reding
2012-03-14 15:56 ` [PATCH v4 10/10] pwm-backlight: Add rudimentary device tree support Thierry Reding
2012-03-15 8:48 ` Arnd Bergmann
2012-03-20 2:59 ` Stephen Warren
2012-03-20 8:39 ` Thierry Reding
2012-03-20 15:27 ` Stephen Warren
2012-03-20 15:43 ` Thierry Reding
2012-03-20 15:56 ` Stephen Warren
2012-03-20 16:08 ` Mark Brown
2012-03-14 23:19 ` [PATCH v4 00/10] Add PWM framework and " H Hartley Sweeten
2012-03-15 6:41 ` Thierry Reding
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