linux-kernel - Re: [PATCH v2] pinctrl: sh-pfc: Rework PFC GPIO support

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Date:	Wed, 17 Feb 2016 16:04:43 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-renesas-soc@...r.kernel.org, linus.walleij@...aro.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	horms@...ge.net.au, geert@...der.be
Subject: Re: [PATCH v2] pinctrl: sh-pfc: Rework PFC GPIO support

Hi Magnus,

Thank you for the patch.

On Wednesday 17 February 2016 17:15:49 Magnus Damm wrote:
> From: Magnus Damm <damm+renesas@...nsource.se>
> 
> The sh-pfc pinctrl driver is currently handling SoC-specific
> PFC hardware blocks on ARM64, ARM and SH architectures.
> 
> For older SoCs using SH cores and some 32-bit ARM SoCs the PFC
> hardware also provides GPIO functionality. On the majority of
> 32-bit ARM SoCs from Renesas and so far all ARM64 SoCs the GPIO
> feature is provided by separate hardware blocks.
> 
> So far GPIO support in the PFC driver has been compiled-in for
> the majority of the SoCs, but with this patch applied the SoCs
> with PFC support may select from one of the following:
>  - CONFIG_PINCTRL_SH_PFC - Used if PFC lacks GPIO hardware
>  - CONFIG_PINCTRL_SH_PFC_GPIO - Used if PFC includes GPIO support
> 
> This patch results in the following changes:
>  - The GPIO functionality is only compiled-in on relevant SoCs
>  - The number of lines of code is reduced
> 
> Build tested using the following configurations:
>  - r8a7795 -> CONFIG_PINCTRL_SH_PFC_GPIO=n -> OK (ARM64)
>  - r8a7790 -> CONFIG_PINCTRL_SH_PFC_GPIO=n -> OK (ARM)
>  - r8a7790 + r8a7740 -> CONFIG_PINCTRL_SH_PFC_GPIO=y -> OK (ARM)
>  - r8a7740 -> CONFIG_PINCTRL_SH_PFC_GPIO=y -> OK (ARM)
>  - sh7751 -> CONFIG_PINCTRL_SH_PFC=n -> OK (SH rts7751r2d1)
>  - sh7724 -> CONFIG_PINCTRL_SH_PFC_GPIO=y -> OK (SH ecovec24)
> 
> Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> 
>  Changes since V1:
>  - Simplied Makefile bits to remove sh-pfc-objs and use new Kconfig symbol
> 
>  drivers/pinctrl/sh-pfc/Kconfig  |   54
> ++++++++++++++------------------------- drivers/pinctrl/sh-pfc/Makefile |  
>  7 +----
>  drivers/pinctrl/sh-pfc/core.c   |    4 +-
>  3 files changed, 24 insertions(+), 41 deletions(-)
> 
> --- 0001/drivers/pinctrl/sh-pfc/Kconfig
> +++ work/drivers/pinctrl/sh-pfc/Kconfig	2016-02-17 16:23:21.630513000 +0900
> @@ -5,7 +5,6 @@
>  if ARCH_SHMOBILE || SUPERH
> 
>  config PINCTRL_SH_PFC
> -	select GPIO_SH_PFC if ARCH_REQUIRE_GPIOLIB
>  	select PINMUX
>  	select PINCONF
>  	select GENERIC_PINCONF
> @@ -13,12 +12,12 @@ config PINCTRL_SH_PFC
>  	help
>  	  This enables pin control drivers for SH and SH Mobile platforms
> 
> -config GPIO_SH_PFC
> -	bool "SuperH PFC GPIO support"
> -	depends on PINCTRL_SH_PFC && GPIOLIB
> +config PINCTRL_SH_PFC_GPIO
> +	select GPIOLIB
> +	select PINCTRL_SH_PFC
> +	def_bool n
>  	help
> -	  This enables support for GPIOs within the SoC's pin function
> -	  controller.
> +	  This enables pin control and GPIO drivers for SH/SH Mobile platforms
> 
>  config PINCTRL_PFC_EMEV2
>  	def_bool y
> @@ -28,12 +27,12 @@ config PINCTRL_PFC_EMEV2
>  config PINCTRL_PFC_R8A73A4
>  	def_bool y
>  	depends on ARCH_R8A73A4
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_R8A7740
>  	def_bool y
>  	depends on ARCH_R8A7740
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_R8A7778
>  	def_bool y
> @@ -73,79 +72,66 @@ config PINCTRL_PFC_R8A7795
>  config PINCTRL_PFC_SH7203
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7203
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7264
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7264
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7269
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7269
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH73A0
>  	def_bool y
>  	depends on ARCH_SH73A0
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
>  	select REGULATOR
> 
>  config PINCTRL_PFC_SH7720
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7720
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7722
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7722
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7723
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7723
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7724
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7724
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7734
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7734
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7757
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7757
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7785
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7785
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SH7786
>  	def_bool y
>  	depends on CPU_SUBTYPE_SH7786
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> +	select PINCTRL_SH_PFC_GPIO
> 
>  config PINCTRL_PFC_SHX3
>  	def_bool y
>  	depends on CPU_SUBTYPE_SHX3
> -	depends on GPIOLIB
> -	select PINCTRL_SH_PFC
> -
> +	select PINCTRL_SH_PFC_GPIO
>  endif
> --- 0001/drivers/pinctrl/sh-pfc/Makefile
> +++ work/drivers/pinctrl/sh-pfc/Makefile	2016-02-17 16:26:18.660513000 
+0900
> @@ -1,8 +1,5 @@
> -sh-pfc-objs			= core.o pinctrl.o
> -ifeq ($(CONFIG_GPIO_SH_PFC),y)
> -sh-pfc-objs			+= gpio.o
> -endif
> -obj-$(CONFIG_PINCTRL_SH_PFC)	+= sh-pfc.o
> +obj-$(CONFIG_PINCTRL_SH_PFC)	+= core.o pinctrl.o
> +obj-$(CONFIG_PINCTRL_SH_PFC_GPIO)	+= gpio.o
>  obj-$(CONFIG_PINCTRL_PFC_EMEV2)	+= pfc-emev2.o
>  obj-$(CONFIG_PINCTRL_PFC_R8A73A4)	+= pfc-r8a73a4.o
>  obj-$(CONFIG_PINCTRL_PFC_R8A7740)	+= pfc-r8a7740.o
> --- 0001/drivers/pinctrl/sh-pfc/core.c
> +++ work/drivers/pinctrl/sh-pfc/core.c	2016-02-17 16:23:21.640513000 +0900
> @@ -558,7 +558,7 @@ static int sh_pfc_probe(struct platform_
>  	if (unlikely(ret != 0))
>  		return ret;
> 
> -#ifdef CONFIG_GPIO_SH_PFC
> +#ifdef CONFIG_PINCTRL_SH_PFC_GPIO
>  	/*
>  	 * Then the GPIO chip
>  	 */
> @@ -584,7 +584,7 @@ static int sh_pfc_remove(struct platform
>  {
>  	struct sh_pfc *pfc = platform_get_drvdata(pdev);
> 
> -#ifdef CONFIG_GPIO_SH_PFC
> +#ifdef CONFIG_PINCTRL_SH_PFC_GPIO
>  	sh_pfc_unregister_gpiochip(pfc);
>  #endif
>  	sh_pfc_unregister_pinctrl(pfc);

-- 
Regards,

Laurent Pinchart