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

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Date:	Wed, 9 Jan 2013 08:46:30 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Boris BREZILLON <linux-arm@...rkiz.com>
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 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

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