From: Arnd Bergmann <arnd@arndb.de>
To: Kukjin Kim <kgene.kim@samsung.com>
Subject: Re: [PATCH 4/6] ARM: s3c24xx: use new PWM driver
Date: Wed, 8 Aug 2012 14:34:55 +0000
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Cc: linux-arm-kernel@lists.infradead.org, arm@kernel.org,
        linux-kernel@vger.kernel.org, Tushar Behera <tushar.behera@linaro.org>
References: <1344430493-5304-1-git-send-email-arnd@arndb.de> <1344430493-5304-5-git-send-email-arnd@arndb.de> <0b6801cd7567$29be48b0$7d3ada10$%kim@samsung.com>
In-Reply-To: <0b6801cd7567$29be48b0$7d3ada10$%kim@samsung.com>
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On Wednesday 08 August 2012, Kukjin Kim wrote:

> diff --git a/arch/arm/mach-s3c24xx/Kconfig b/arch/arm/mach-s3c24xx/Kconfig
> index e249611..d56b0f7 100644
> --- a/arch/arm/mach-s3c24xx/Kconfig
> +++ b/arch/arm/mach-s3c24xx/Kconfig
> @@ -483,7 +483,7 @@ config MACH_NEO1973_GTA02
>  	select I2C
>  	select POWER_SUPPLY
>  	select MACH_NEO1973
> -	select S3C2410_PWM
> +	select S3C24XX_PWM
>  	select S3C_DEV_USB_HOST
>  	help
>  	   Say Y here if you are using the Openmoko GTA02 / Freerunner GSM
> Phone
> @@ -493,7 +493,7 @@ config MACH_RX1950
>  	select S3C24XX_DCLK
>  	select PM_H1940 if PM
>  	select I2C
> -	select S3C2410_PWM
> +	select S3C24XX_PWM
>  	select S3C_DEV_NAND
>  	select S3C2410_IOTIMING if S3C2440_CPUFREQ
>  	select S3C2440_XTAL_16934400
> diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
> index 7aca31c..dcdfb77 100644
> --- a/arch/arm/plat-samsung/Kconfig
> +++ b/arch/arm/plat-samsung/Kconfig
> @@ -403,7 +403,7 @@ config S5P_DEV_USB_EHCI
>  
>  config S3C24XX_PWM
>  	bool "PWM device support"
> -	select HAVE_PWM
> +	select PWM
>  	help
>  	  Support for exporting the PWM timer blocks via the pwm device
>  	  system
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index 8fc3808..c74d055 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -58,14 +58,12 @@ config PWM_PXA
>  	  will be called pwm-pxa.
>  
>  config PWM_SAMSUNG
> -	tristate "Samsung pwm support"
> +	bool "Samsung PWM support"
>  	depends on PLAT_SAMSUNG
> +	default y
>  	help
>  	  Generic PWM framework driver for Samsung.
>  
> -	  To compile this driver as a module, choose M here: the module
> -	  will be called pwm-samsung.
> -
>  config PWM_TEGRA
>  	tristate "NVIDIA Tegra PWM support"
>  	depends on ARCH_TEGRA

This approach has two disadvantages compared to mine:

* When building for the samsung platforms other than rx1950 or gta02,
  you can no longer have the PWM driver as a loadable module, for no
  good reason.

* It is still possible to manually disable PWM_SAMSUNG, even on
  rx1950 and gta02, because the Kconfig symbol is visible.

I've added a "Reported-by: Tushar Behera <tushar.behera@linaro.org>"
line to my version of the patch, but I would prefer to keep that
approach. I have also changed the patch to use the S3C24XX_PWM
symbol because that lets everyone migrate the defconfig files.

Do you want to give this patch some more testing, or should I keep
it in arm-soc?

	Arnd
---
>From 438b0cf94adb2528bdeeb71314f7be16512ea5b1 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 4 Aug 2012 07:52:19 +0000
Subject: [PATCH] ARM: s3c24xx: use new PWM driver

The samsung PWM driver has moved to the new PWM subsystem, which
changed the Kconfig symbol for that driver, but the rx1950 and
gta02 boards still uses the old one.

Without this patch, building s3c2410_defconfig results in:

arch/arm/mach-s3c24xx/built-in.o: In function `rx1950_lcd_power':
arch/arm/mach-s3c24xx/mach-rx1950.c:430: undefined reference to `pwm_config'
arch/arm/mach-s3c24xx/mach-rx1950.c:431: undefined reference to `pwm_disable'
arch/arm/mach-s3c24xx/mach-rx1950.c:437: undefined reference to `pwm_config'
arch/arm/mach-s3c24xx/mach-rx1950.c:438: undefined reference to `pwm_enable'
arch/arm/mach-s3c24xx/built-in.o: In function `rx1950_backlight_exit':
arch/arm/mach-s3c24xx/mach-rx1950.c:504: undefined reference to `pwm_free'
arch/arm/mach-s3c24xx/built-in.o: In function `rx1950_backlight_init':
arch/arm/mach-s3c24xx/mach-rx1950.c:487: undefined reference to `pwm_request'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Tushar Behera <tushar.behera@linaro.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/arch/arm/mach-s3c24xx/Kconfig b/arch/arm/mach-s3c24xx/Kconfig
index e249611..d56b0f7 100644
--- a/arch/arm/mach-s3c24xx/Kconfig
+++ b/arch/arm/mach-s3c24xx/Kconfig
@@ -483,7 +483,7 @@ config MACH_NEO1973_GTA02
 	select I2C
 	select POWER_SUPPLY
 	select MACH_NEO1973
-	select S3C2410_PWM
+	select S3C24XX_PWM
 	select S3C_DEV_USB_HOST
 	help
 	   Say Y here if you are using the Openmoko GTA02 / Freerunner GSM Phone
@@ -493,7 +493,7 @@ config MACH_RX1950
 	select S3C24XX_DCLK
 	select PM_H1940 if PM
 	select I2C
-	select S3C2410_PWM
+	select S3C24XX_PWM
 	select S3C_DEV_NAND
 	select S3C2410_IOTIMING if S3C2440_CPUFREQ
 	select S3C2440_XTAL_16934400
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 7aca31c..9c3b90c 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -403,7 +403,8 @@ config S5P_DEV_USB_EHCI
 
 config S3C24XX_PWM
 	bool "PWM device support"
-	select HAVE_PWM
+	select PWM
+	select PWM_SAMSUNG
 	help
 	  Support for exporting the PWM timer blocks via the pwm device
 	  system

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