linux-kernel - Re: [PATCH 0/7] Remove HAVE

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Date:	Tue, 11 Feb 2014 12:02:21 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>,
	'Ralf Baechle' <ralf@...ux-mips.org>,
	'Dmitry Torokhov' <dmitry.torokhov@...il.com>,
	'Thierry Reding' <thierry.reding@...il.com>
Cc:	'Linus Walleij' <linus.walleij@...aro.org>,
	'Russell King - ARM Linux' <linux@....linux.org.uk>,
	'Eric Miao' <eric.y.miao@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mips@...ux-mips.org, linux-input@...r.kernel.org,
	linux-pwm@...r.kernel.org, 'Jingoo Han' <jg1.han@...sung.com>,
	'Sascha Hauer' <s.hauer@...gutronix.de>,
	'Roland Stigge' <stigge@...com.de>
Subject: Re: [PATCH 0/7] Remove HAVE_PWM config option

On Monday, February 10, 2014 10:07 AM, Jingoo Han wrote:
> 
> The HAVE_PWM symbol is only for legacy platforms that provide
> the PWM API without using the generic framework, while PWM symbol
> is used for PWM drivers using the generic PWM framework.
> 
> I looked at all HAVE_PWMs in the latest mainline kernel 3.14-rc1.
> Three platforms are still using HAVE_PWM as below:
> 
> 1. ARM - PXA
>   ./arch/arm/mach-pxa/Kconfig
> 
> 2. ARM - NXP LPC32XX
>   ./arch/arm/Kconfig
>   config ARCH_LPC32XX
>   	select HAVE_PWM
> 
> 3. MIPS - Ingenic JZ4740 based machines
>   ./arch/mips/Kconfig
>   config MACH_JZ4740
>   	select HAVE_PWM
> 
> However, the legacy PWM drivers for PXA, LPC32XX, and JZ474 were
> already moved to the generic PWM framework.
>   ./drivers/pwm/pwm-pxa.c
>   ./drivers/pwm/pwm-lpc32xx.c
>   ./drivers/pwm/pwm-jz4740.c
> 
> In conclusion, HAVE_PWM should be removed, because HAVE_PWM is
> NOT required anymore.
> 
> Jingoo Han (7):
>       ARM: pxa: don't select HAVE_PWM
>       ARM: lpc32xx: don't select HAVE_PWM
>       ARM: remove HAVE_PWM config option
>       MIPS: jz4740: don't select HAVE_PWM
>       Input: max8997_haptic: remove HAVE_PWM dependencies
>       Input: pwm-beepe: remove HAVE_PWM dependencies
>       pwm: don't use IS_ENABLED(CONFIG_HAVE_PWM)
> 
>  arch/arm/Kconfig           |    4 ----
>  arch/arm/mach-pxa/Kconfig  |   15 ---------------
>  arch/mips/Kconfig          |    1 -
>  drivers/input/misc/Kconfig |    4 ++--
>  include/linux/pwm.h        |    2 +-
>  5 files changed, 3 insertions(+), 23 deletions(-)

(+cc Sascha Hauer, Roland Stigge)

The same patch was already submitted by Sascha Hauer. [1]
So, please ignore this patch. Thank you.

[1] https://lkml.org/lkml/2014/1/16/262

Best regards,
Jingoo Han

> 
> I would like to merge these patches as below:
> 
> 1. Through arm-soc tree
>   [PATCH 1/7] ARM: pxa: don't select HAVE_PWM
>   [PATCH 2/7] ARM: lpc32xx: don't select HAVE_PWM
>   [PATCH 3/7] ARM: remove HAVE_PWM config option
> 
> 2. Through MIPS tree
>   [PATCH 4/7] MIPS: jz4740: don't select HAVE_PWM
> 
> 3. Through Input tree
>   [PATCH 5/7] Input: max8997_haptic: remove HAVE_PWM dependencies
>   [PATCH 6/7] Input: pwm-beepe: remove HAVE_PWM dependencies
> 
> 4. Through PWM tree
>   [PATCH 7/7] pwm: don't use IS_ENABLED(CONFIG_HAVE_PWM)
> 
> After merging these patches, all HAVE_PWM will be removed from
> the mainline kernel. Thank you. :-)
> 
> Best regards,
> Jingoo Han

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