| Message ID | 1349330819-11924-1-git-send-email-thierry.reding@avionic-design.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 10/04/2012 08:06 AM, Thierry Reding wrote: > [...] > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > index 331d574..b38f23d 100644 > --- a/arch/mips/Kconfig > +++ b/arch/mips/Kconfig > @@ -219,7 +219,8 @@ config MACH_JZ4740 > select GENERIC_GPIO > select ARCH_REQUIRE_GPIOLIB > select SYS_HAS_EARLY_PRINTK > - select HAVE_PWM > + select PWM > + select PWM_JZ4740 > select HAVE_CLK > select GENERIC_IRQ_CHIP I'm not sure if this is such a good idea, not all jz4740 based board necessarily require PWM. - Lars
On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote: > On 10/04/2012 08:06 AM, Thierry Reding wrote: > > [...] > > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > > index 331d574..b38f23d 100644 > > --- a/arch/mips/Kconfig > > +++ b/arch/mips/Kconfig > > @@ -219,7 +219,8 @@ config MACH_JZ4740 > > select GENERIC_GPIO > > select ARCH_REQUIRE_GPIOLIB > > select SYS_HAS_EARLY_PRINTK > > - select HAVE_PWM > > + select PWM > > + select PWM_JZ4740 > > select HAVE_CLK > > select GENERIC_IRQ_CHIP > > I'm not sure if this is such a good idea, not all jz4740 based board > necessarily require PWM. This really only restores previous behaviour. But I agree that this is potentially not what we want. Maybe we should just not select this for any boards but rather leave it up to some default configuration. If so the patch can be made simpler by just removing the HAVE_PWM entries. Thierry
On 10/04/2012 08:29 PM, Thierry Reding wrote: > On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote: >> On 10/04/2012 08:06 AM, Thierry Reding wrote: >>> [...] >>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig >>> index 331d574..b38f23d 100644 >>> --- a/arch/mips/Kconfig >>> +++ b/arch/mips/Kconfig >>> @@ -219,7 +219,8 @@ config MACH_JZ4740 >>> select GENERIC_GPIO >>> select ARCH_REQUIRE_GPIOLIB >>> select SYS_HAS_EARLY_PRINTK >>> - select HAVE_PWM >>> + select PWM >>> + select PWM_JZ4740 >>> select HAVE_CLK >>> select GENERIC_IRQ_CHIP >> >> I'm not sure if this is such a good idea, not all jz4740 based board >> necessarily require PWM. > > This really only restores previous behaviour. But I agree that this is > potentially not what we want. Maybe we should just not select this for > any boards but rather leave it up to some default configuration. If so > the patch can be made simpler by just removing the HAVE_PWM entries. At least for JZ4740 I think that is the better solution. Thanks, - Lars
On Thu, Oct 04, 2012 at 08:48:54PM +0200, Lars-Peter Clausen wrote: > On 10/04/2012 08:29 PM, Thierry Reding wrote: > > On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote: > >> On 10/04/2012 08:06 AM, Thierry Reding wrote: > >>> [...] > >>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > >>> index 331d574..b38f23d 100644 > >>> --- a/arch/mips/Kconfig > >>> +++ b/arch/mips/Kconfig > >>> @@ -219,7 +219,8 @@ config MACH_JZ4740 > >>> select GENERIC_GPIO > >>> select ARCH_REQUIRE_GPIOLIB > >>> select SYS_HAS_EARLY_PRINTK > >>> - select HAVE_PWM > >>> + select PWM > >>> + select PWM_JZ4740 > >>> select HAVE_CLK > >>> select GENERIC_IRQ_CHIP > >> > >> I'm not sure if this is such a good idea, not all jz4740 based board > >> necessarily require PWM. > > > > This really only restores previous behaviour. But I agree that this is > > potentially not what we want. Maybe we should just not select this for > > any boards but rather leave it up to some default configuration. If so > > the patch can be made simpler by just removing the HAVE_PWM entries. > > At least for JZ4740 I think that is the better solution. Okay, I'll give other people the chance to comment on this. Especially for PXA there are many boards that use the PWM for backlight and it would be interesting to hear from them how they want this to be handled. Thierry
On Thu, Oct 04, 2012 at 08:06:59AM +0200, Thierry Reding wrote: > Now that all drivers have been moved to the PWM subsystem, remove the > legacy HAVE_PWM symbol and replace it with the new PWM symbol. While at > it, select the PWM subsystem and corresponding PWM driver on boards that > require PWM functionality. > > Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> > Cc: Russell King <linux@arm.linux.org.uk> > Cc: Shawn Guo <shawn.guo@linaro.org> > Cc: Eric Miao <eric.y.miao@gmail.com> > Cc: Haojian Zhuang <haojian.zhuang@gmail.com> > Cc: Ralf Baechle <ralf@linux-mips.org> > Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> > Cc: Bryan Wu <bryan.wu@canonical.com> > Cc: Richard Purdie <rpurdie@rpsys.net> > Cc: Samuel Ortiz <sameo@linux.intel.com> > Cc: Ashish Jangam <ashish.jangam@kpitcummins.com> > Cc: Andrew Jones <drjones@redhat.com> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-mips@linux-mips.org > Cc: linux-input@vger.kernel.org > Cc: linux-leds@vger.kernel.org > --- > arch/arm/Kconfig | 6 ++---- > arch/arm/mach-mxs/Kconfig | 6 ++++-- Shawn Guo <shawn.guo@linaro.org> > arch/arm/mach-pxa/Kconfig | 42 ++++++++++++++++++++++++++++-------------- > arch/mips/Kconfig | 3 ++- > drivers/input/misc/Kconfig | 4 ++-- > drivers/leds/Kconfig | 2 +- > include/linux/pwm.h | 2 +- > 7 files changed, 40 insertions(+), 25 deletions(-)
On Fri, Oct 5, 2012 at 3:13 AM, Thierry Reding <thierry.reding@avionic-design.de> wrote: > On Thu, Oct 04, 2012 at 08:48:54PM +0200, Lars-Peter Clausen wrote: >> On 10/04/2012 08:29 PM, Thierry Reding wrote: >> > On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote: >> >> On 10/04/2012 08:06 AM, Thierry Reding wrote: >> >>> [...] >> >>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig >> >>> index 331d574..b38f23d 100644 >> >>> --- a/arch/mips/Kconfig >> >>> +++ b/arch/mips/Kconfig >> >>> @@ -219,7 +219,8 @@ config MACH_JZ4740 >> >>> select GENERIC_GPIO >> >>> select ARCH_REQUIRE_GPIOLIB >> >>> select SYS_HAS_EARLY_PRINTK >> >>> - select HAVE_PWM >> >>> + select PWM >> >>> + select PWM_JZ4740 >> >>> select HAVE_CLK >> >>> select GENERIC_IRQ_CHIP >> >> >> >> I'm not sure if this is such a good idea, not all jz4740 based board >> >> necessarily require PWM. >> > >> > This really only restores previous behaviour. But I agree that this is >> > potentially not what we want. Maybe we should just not select this for >> > any boards but rather leave it up to some default configuration. If so >> > the patch can be made simpler by just removing the HAVE_PWM entries. >> >> At least for JZ4740 I think that is the better solution. > > Okay, I'll give other people the chance to comment on this. Especially > for PXA there are many boards that use the PWM for backlight and it > would be interesting to hear from them how they want this to be handled. I'd say the original intention to introduce HAVE_PWM (although PXA makes a lot use of this, but I remember Russell was the first to propose this), is for board config to indicate its potential usage of the PWM or rather if PWM is available for use on the board, and then leave the developer another config option to build or not-to-build. Personally I think removing HAVE_PWM will simplify the code a bit and that's a good thing, on the other hand, how to keep a certain level of flexibility mentioned above remains a small question. I guess with device tree, this can be mitigated a bit.
On Mon, Oct 08, 2012 at 10:45:44AM +0800, Eric Miao wrote: > On Fri, Oct 5, 2012 at 3:13 AM, Thierry Reding > <thierry.reding@avionic-design.de> wrote: > > On Thu, Oct 04, 2012 at 08:48:54PM +0200, Lars-Peter Clausen wrote: > >> On 10/04/2012 08:29 PM, Thierry Reding wrote: > >> > On Thu, Oct 04, 2012 at 05:00:23PM +0200, Lars-Peter Clausen wrote: > >> >> On 10/04/2012 08:06 AM, Thierry Reding wrote: > >> >>> [...] > >> >>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > >> >>> index 331d574..b38f23d 100644 > >> >>> --- a/arch/mips/Kconfig > >> >>> +++ b/arch/mips/Kconfig > >> >>> @@ -219,7 +219,8 @@ config MACH_JZ4740 > >> >>> select GENERIC_GPIO > >> >>> select ARCH_REQUIRE_GPIOLIB > >> >>> select SYS_HAS_EARLY_PRINTK > >> >>> - select HAVE_PWM > >> >>> + select PWM > >> >>> + select PWM_JZ4740 > >> >>> select HAVE_CLK > >> >>> select GENERIC_IRQ_CHIP > >> >> > >> >> I'm not sure if this is such a good idea, not all jz4740 based board > >> >> necessarily require PWM. > >> > > >> > This really only restores previous behaviour. But I agree that this is > >> > potentially not what we want. Maybe we should just not select this for > >> > any boards but rather leave it up to some default configuration. If so > >> > the patch can be made simpler by just removing the HAVE_PWM entries. > >> > >> At least for JZ4740 I think that is the better solution. > > > > Okay, I'll give other people the chance to comment on this. Especially > > for PXA there are many boards that use the PWM for backlight and it > > would be interesting to hear from them how they want this to be handled. > > I'd say the original intention to introduce HAVE_PWM (although PXA > makes a lot use of this, but I remember Russell was the first to propose > this), is for board config to indicate its potential usage of the PWM or > rather if PWM is available for use on the board, and then leave the > developer another config option to build or not-to-build. But with HAVE_PWM there was never a different configuration option to enable the PWM driver. All architectures that used the HAVE_PWM symbol built the driver based on its selection. The meaning seemed more like "the PWM API is available" rather than anything else. Given that, HAVE_PWM would now be replaced by just PWM since that makes the API available. Client drivers would still be able to compile properly but fail at runtime if no driver actually provided any PWM devices. Note that starting with 3.7 the API will even be available in the form of dummy implementations if PWM is not selected. > Personally I think removing HAVE_PWM will simplify the code a bit > and that's a good thing, on the other hand, how to keep a certain level > of flexibility mentioned above remains a small question. I guess with > device tree, this can be mitigated a bit. I think, given the above, that the best solution would be to not select any PWM-related symbols from boards and handle this via the board default configurations. I was just worrying that we were changing existing behaviour. On the other hand behaviour was already changed by making the drivers no longer conditional on HAVE_PWM. If nobody has any objections, my tendency would be to just not replace HAVE_PWM but just get rid of it. Of course, as I mentioned above, it would require the board default configurations to be updated and select the PWM and corresponding driver symbol in order to restore previous behaviour. Thierry
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index e91c7cd..a0cebf8 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -69,9 +69,6 @@ config ARM_DMA_USE_IOMMU select ARM_HAS_SG_CHAIN bool -config HAVE_PWM - bool - config MIGHT_HAVE_PCI bool @@ -610,7 +607,8 @@ config ARCH_LPC32XX select CLKDEV_LOOKUP select GENERIC_CLOCKEVENTS select USE_OF - select HAVE_PWM + select PWM + select PWM_LPC32XX help Support for the NXP LPC32XX family of processors diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig index 9a8bbda..2fc01bd 100644 --- a/arch/arm/mach-mxs/Kconfig +++ b/arch/arm/mach-mxs/Kconfig @@ -6,7 +6,8 @@ config SOC_IMX23 bool select ARM_AMBA select CPU_ARM926T - select HAVE_PWM + select PWM + select PWM_MXS select PINCTRL_IMX23 config SOC_IMX28 @@ -14,7 +15,8 @@ config SOC_IMX28 select ARM_AMBA select CPU_ARM926T select HAVE_CAN_FLEXCAN if CAN - select HAVE_PWM + select PWM + select PWM_MXS select PINCTRL_IMX28 comment "MXS platforms:" diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig index fe2d1f8..14f41c3 100644 --- a/arch/arm/mach-pxa/Kconfig +++ b/arch/arm/mach-pxa/Kconfig @@ -33,12 +33,14 @@ config ARCH_LUBBOCK config MACH_MAINSTONE bool "Intel HCDDBBVA0 Development Platform (aka Mainstone)" select PXA27x - select HAVE_PWM + select PWM + select PWM_PXA config MACH_ZYLONITE bool select PXA3xx - select HAVE_PWM + select PWM + select PWM_PXA config MACH_ZYLONITE300 bool "PXA3xx Development Platform (aka Zylonite) PXA300/310" @@ -78,7 +80,8 @@ config ARCH_VIPER select PXA25x select ISA select I2C_GPIO - select HAVE_PWM + select PWM + select PWM_PXA select PXA_HAVE_ISA_IRQS select ARCOM_PCMCIA @@ -128,7 +131,8 @@ config MACH_CM_X300 select PXA3xx select CPU_PXA300 select CPU_PXA310 - select HAVE_PWM + select PWM + select PWM_PXA config MACH_CAPC7117 bool "Embedian CAPC-7117 evaluation kit based on the MXM-8x10 CoM" @@ -220,7 +224,8 @@ config TRIZEPS_PCMCIA config MACH_LOGICPD_PXA270 bool "LogicPD PXA270 Card Engine Development Platform" select PXA27x - select HAVE_PWM + select PWM + select PWM_PXA config MACH_PCM027 bool "Phytec phyCORE-PXA270 CPU module (PCM-027)" @@ -229,7 +234,8 @@ config MACH_PCM027 config MACH_PCM990_BASEBOARD bool "PHYTEC PCM-990 development board" - select HAVE_PWM + select PWM + select PWM_PXA depends on MACH_PCM027 choice @@ -255,7 +261,8 @@ config MACH_COLIBRI_PXA270_INCOME bool "Income s.r.o. PXA270 SBC" depends on MACH_COLIBRI select PXA27x - select HAVE_PWM + select PWM + select PWM_PXA config MACH_COLIBRI300 bool "Toradex Colibri PXA300/310" @@ -285,7 +292,8 @@ config MACH_H4700 bool "HP iPAQ hx4700" select PXA27x select IWMMXT - select HAVE_PWM + select PWM + select PWM_PXA config MACH_H5000 bool "HP iPAQ h5000" @@ -299,13 +307,15 @@ config MACH_MAGICIAN bool "Enable HTC Magician Support" select PXA27x select IWMMXT - select HAVE_PWM + select PWM + select PWM_PXA config MACH_MIOA701 bool "Mitac Mio A701 Support" select PXA27x select IWMMXT - select HAVE_PWM + select PWM + select PWM_PXA select GPIO_SYSFS help Say Y here if you intend to run this kernel on a @@ -316,7 +326,8 @@ config PXA_EZX bool "Motorola EZX Platform" select PXA27x select IWMMXT - select HAVE_PWM + select PWM + select PWM_PXA config MACH_EZX_A780 bool "Motorola EZX A780" @@ -354,7 +365,8 @@ config MACH_MP900C config ARCH_PXA_PALM bool "PXA based Palm PDAs" - select HAVE_PWM + select PWM + select PWM_PXA config MACH_PALM27X bool @@ -454,7 +466,8 @@ config MACH_RAUMFELD_RC select PXA3xx select CPU_PXA300 select POWER_SUPPLY - select HAVE_PWM + select PWM + select PWM_PXA config MACH_RAUMFELD_CONNECTOR bool "Raumfeld Connector" @@ -617,7 +630,8 @@ config MACH_E800 config MACH_ZIPIT2 bool "Zipit Z2 Handheld" select PXA27x - select HAVE_PWM + select PWM + select PWM_PXA endif endmenu diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 331d574..b38f23d 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -219,7 +219,8 @@ config MACH_JZ4740 select GENERIC_GPIO select ARCH_REQUIRE_GPIOLIB select SYS_HAS_EARLY_PRINTK - select HAVE_PWM + select PWM + select PWM_JZ4740 select HAVE_CLK select GENERIC_IRQ_CHIP diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 7c0f1ec..af6188b 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -146,7 +146,7 @@ config INPUT_MAX8925_ONKEY config INPUT_MAX8997_HAPTIC tristate "MAXIM MAX8997 haptic controller support" - depends on HAVE_PWM && MFD_MAX8997 + depends on PWM && MFD_MAX8997 select INPUT_FF_MEMLESS help This option enables device driver support for the haptic controller @@ -444,7 +444,7 @@ config INPUT_PCF8574 config INPUT_PWM_BEEPER tristate "PWM beeper support" - depends on HAVE_PWM + depends on PWM help Say Y here to get support for PWM based beeper devices. diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index c96bbaa..a720d99 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -298,7 +298,7 @@ config LEDS_DAC124S085 config LEDS_PWM tristate "PWM driven LED Support" depends on LEDS_CLASS - depends on HAVE_PWM + depends on PWM help This option enables support for pwm driven LEDs diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 112b314..eea3f26 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -7,7 +7,7 @@ struct pwm_device; struct seq_file; -#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM) +#if IS_ENABLED(CONFIG_PWM) /* * pwm_request - request a PWM device */
Now that all drivers have been moved to the PWM subsystem, remove the legacy HAVE_PWM symbol and replace it with the new PWM symbol. While at it, select the PWM subsystem and corresponding PWM driver on boards that require PWM functionality. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Shawn Guo <shawn.guo@linaro.org> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Bryan Wu <bryan.wu@canonical.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Ashish Jangam <ashish.jangam@kpitcummins.com> Cc: Andrew Jones <drjones@redhat.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-input@vger.kernel.org Cc: linux-leds@vger.kernel.org --- arch/arm/Kconfig | 6 ++---- arch/arm/mach-mxs/Kconfig | 6 ++++-- arch/arm/mach-pxa/Kconfig | 42 ++++++++++++++++++++++++++++-------------- arch/mips/Kconfig | 3 ++- drivers/input/misc/Kconfig | 4 ++-- drivers/leds/Kconfig | 2 +- include/linux/pwm.h | 2 +- 7 files changed, 40 insertions(+), 25 deletions(-)