linux-kernel - Re: [PATCH v5] pwm: atmel: add Timer Counter Block PWM driver

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Message-ID: <50ED4932.50907@overkiz.com>
Date:	Wed, 09 Jan 2013 11:40:50 +0100
From:	Boris BREZILLON <linux-arm@...rkiz.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
CC:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Andrew Victor <linux@...im.org.za>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>
Subject: Re: [PATCH v5] pwm: atmel: add Timer Counter Block PWM driver

On 09/01/2013 08:46, Thierry Reding wrote:
> On Tue, Jan 08, 2013 at 04:36:42PM +0100, Boris BREZILLON wrote:
>> Hi,
>>
>> This patch adds a PWM driver based on Atmel Timer Counter Block.
>> Timer Counter Block is used in Waveform generator mode.
>>
>> A Timer Counter Block provides up to 6 PWM devices grouped by 2:
>> * group 0 = PWM 0 and 1
>> * group 1 = PWM 2 and 3
>> * group 2 = PMW 4 and 5
>>
>> PWM devices in a given group must be configured with the same
>> period value.
>> If a PWM device in a group tries to change the period value and
>> the other device is already configured with a different value an
>> error will be returned.
>>
>> This driver requires device tree support.
>> The Timer Counter Block number used to create a PWM chip is
>> given by tc-block field in an "atmel,tcb-pwm" compatible node.
>>
>> This patch was tested on kizbox board (at91sam9g20 SoC) with 
>> pwm-leds.
>>
>> Regards,
>>
>> Boris
>>
>> Signed-off-by: Boris BREZILLON <linux-arm@...rkiz.com>
>> ---
>> Changes since v1:
>> 	- Fix device tree binding Documentation
>> 	- Fix Kconfig issues (missing OF dependency, 
>> 				deprecated HAVE_PWM select, ...)
>> 	- Fix various coding style issues.
>> 	- Cleanup code and add some comments.
>>
>> Changes since v2:
>> 	- Replace kzalloc/kfree with managed versions
>> 	  (devm_kzalloc/devm_kfree).
>> 	- Add one cell to device tree binding to support polarity
>> 	  flag.
>> 	- Replace min computation (2 div -> 1 mul + 1 div).
>>
>> Changes since v3:
>> 	- Fix device tree binding Documentation
>> 	- Fix Kconfig description
>> 	- Fix coding style issues (function parameters alignment)
>> 	- Replace 1000000000 value with NSEC_PER_SEC macro
>> 	- Get rid of newcmr variable in enable/disable functions
>> 	- Remove unneeded devm_kfree
>> 	- Add missing atmel_tc_free
>>
>> Changes since v4:
>> 	- Add missing comments
>> 	- Fix coding style issues (multi-line error string)
>> 	- Fix wrong MODULE_DEVICE_TABLE setting
>> 	- Remove unneeded MODULE_ALIAS declaration
>>
>>  .../devicetree/bindings/pwm/atmel-tcb-pwm.txt      |   18 +
>>  drivers/pwm/Kconfig                                |   12 +
>>  drivers/pwm/Makefile                               |    1 +
>>  drivers/pwm/pwm-atmel-tcb.c                        |  445 ++++++++++++++++++++
>>  4 files changed, 476 insertions(+), 0 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/pwm/atmel-tcb-pwm.txt
>>  create mode 100644 drivers/pwm/pwm-atmel-tcb.c
> 
> Applied with minor changes to the commit message, thanks.
> 
> Thierry
> 

Thanks
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