[PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[Geert Uytterhoeven]

Despite using the same compatible values ("r8a7795"-based) because of
historical reasons, R-Car H3 ES1.x (R8A77950) and R-Car H3 ES2.0+
(R8A77951) are really different SoCs, with different part numbers, and
with different Pin Function Controller blocks.

Reflect this in the pinctrl configuration, by replacing the existing
CONFIG_PINCTRL_PFC_R8A7795 symbol by two new config symbols:
CONFIG_PINCTRL_PFC_R8A77950 and CONFIG_PINCTRL_PFC_R8A77951.  The latter
are selected automatically, depending on the soon-to-be-introduced
corresponding SoC-specific config options, and on the current common
config option, to relax dependencies.

Rename the individual pin control driver source files from
pfc-r8a7795-es1.c to pfc-r8a77950.c, and from pfc-r8a7795.c to
pfc-r8a77951.c, and make them truly independent.
As both SoCs share the same compatible value, special care must be taken
to match them to the correct pin control driver, if support for it is
included in the running kernel.

This will allow making support for early R-Car H3 revisions optional,
the largest share of which is taken by the pin control driver.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Suggestions for simplifying sh_pfc_quirk_match(), or for alternative
solutions are welcome!

This complements, but has no dependencies on "[PATCH 0/5] arm64:
renesas: Split/rename R-Car H3 support"
https://lore.kernel.org/linux-renesas-soc/20191217183841.432-1-geert+renesas@glider.be/T/#t

For your convenience, all of this is available in the
topic/r8a7795-rename-v1 branch of my renesas-drivers git repository at
git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git.
---
 drivers/pinctrl/sh-pfc/Kconfig                | 10 ++-
 drivers/pinctrl/sh-pfc/Makefile               |  4 +-
 drivers/pinctrl/sh-pfc/core.c                 | 65 +++++++++++++++----
 .../{pfc-r8a7795-es1.c => pfc-r8a77950.c}     | 26 ++++----
 .../sh-pfc/{pfc-r8a7795.c => pfc-r8a77951.c}  | 39 ++++-------
 drivers/pinctrl/sh-pfc/sh_pfc.h               |  4 +-
 6 files changed, 89 insertions(+), 59 deletions(-)
 rename drivers/pinctrl/sh-pfc/{pfc-r8a7795-es1.c => pfc-r8a77950.c} (99%)
 rename drivers/pinctrl/sh-pfc/{pfc-r8a7795.c => pfc-r8a77951.c} (99%)

diff --git a/drivers/pinctrl/sh-pfc/Kconfig b/drivers/pinctrl/sh-pfc/Kconfig
index ecf3b045bf755008..cf0e0dc42b84c06f 100644
--- a/drivers/pinctrl/sh-pfc/Kconfig
+++ b/drivers/pinctrl/sh-pfc/Kconfig
@@ -26,7 +26,8 @@ config PINCTRL_SH_PFC
 	select PINCTRL_PFC_R8A7792 if ARCH_R8A7792
 	select PINCTRL_PFC_R8A7793 if ARCH_R8A7793
 	select PINCTRL_PFC_R8A7794 if ARCH_R8A7794
-	select PINCTRL_PFC_R8A7795 if ARCH_R8A7795
+	select PINCTRL_PFC_R8A77950 if ARCH_R8A77950 || ARCH_R8A7795
+	select PINCTRL_PFC_R8A77951 if ARCH_R8A77951 || ARCH_R8A7795
 	select PINCTRL_PFC_R8A77960 if ARCH_R8A77960
 	select PINCTRL_PFC_R8A77961 if ARCH_R8A77961
 	select PINCTRL_PFC_R8A77965 if ARCH_R8A77965
@@ -115,8 +116,11 @@ config PINCTRL_PFC_R8A7793
 config PINCTRL_PFC_R8A7794
 	bool "R-Car E2 pin control support" if COMPILE_TEST
 
-config PINCTRL_PFC_R8A7795
-	bool "R-Car H3 pin control support" if COMPILE_TEST
+config PINCTRL_PFC_R8A77950
+	bool "R-Car H3 ES1.x pin control support" if COMPILE_TEST
+
+config PINCTRL_PFC_R8A77951
+	bool "R-Car H3 ES2.0+ pin control support" if COMPILE_TEST
 
 config PINCTRL_PFC_R8A77960
 	bool "R-Car M3-W pin control support" if COMPILE_TEST
diff --git a/drivers/pinctrl/sh-pfc/Makefile b/drivers/pinctrl/sh-pfc/Makefile
index 3bc05666e1a6652e..9ebe321d24c488b0 100644
--- a/drivers/pinctrl/sh-pfc/Makefile
+++ b/drivers/pinctrl/sh-pfc/Makefile
@@ -18,8 +18,8 @@ obj-$(CONFIG_PINCTRL_PFC_R8A7791)	+= pfc-r8a7791.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7792)	+= pfc-r8a7792.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7793)	+= pfc-r8a7791.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7794)	+= pfc-r8a7794.o
-obj-$(CONFIG_PINCTRL_PFC_R8A7795)	+= pfc-r8a7795.o
-obj-$(CONFIG_PINCTRL_PFC_R8A7795)	+= pfc-r8a7795-es1.o
+obj-$(CONFIG_PINCTRL_PFC_R8A77950)	+= pfc-r8a77950.o
+obj-$(CONFIG_PINCTRL_PFC_R8A77951)	+= pfc-r8a77951.o
 obj-$(CONFIG_PINCTRL_PFC_R8A77960)	+= pfc-r8a7796.o
 obj-$(CONFIG_PINCTRL_PFC_R8A77961)	+= pfc-r8a7796.o
 obj-$(CONFIG_PINCTRL_PFC_R8A77965)	+= pfc-r8a77965.o
diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 65e52688f0916cbf..1ae79690d2d74756 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/psci.h>
 #include <linux/slab.h>
+#include <linux/sys_soc.h>
 
 #include "core.h"
 
@@ -568,18 +569,18 @@ static const struct of_device_id sh_pfc_of_table[] = {
 		.data = &r8a7794_pinmux_info,
 	},
 #endif
-#ifdef CONFIG_PINCTRL_PFC_R8A7795
+/* Both r8a7795 entries must be present to make sanity checks work */
+#ifdef CONFIG_PINCTRL_PFC_R8A77950
 	{
 		.compatible = "renesas,pfc-r8a7795",
-		.data = &r8a7795_pinmux_info,
+		.data = &r8a77950_pinmux_info,
 	},
-#ifdef DEBUG
+#endif
+#ifdef CONFIG_PINCTRL_PFC_R8A77951
 	{
-		/* For sanity checks only (nothing matches against this) */
-		.compatible = "renesas,pfc-r8a77950",	/* R-Car H3 ES1.0 */
-		.data = &r8a7795es1_pinmux_info,
+		.compatible = "renesas,pfc-r8a7795",
+		.data = &r8a77951_pinmux_info,
 	},
-#endif /* DEBUG */
 #endif
 #ifdef CONFIG_PINCTRL_PFC_R8A77960
 	{
@@ -886,19 +887,57 @@ static void __init sh_pfc_check_driver(const struct platform_driver *pdrv)
 static inline void sh_pfc_check_driver(struct platform_driver *pdrv) {}
 #endif /* !DEBUG */
 
-static int sh_pfc_probe(struct platform_device *pdev)
-{
 #ifdef CONFIG_OF
-	struct device_node *np = pdev->dev.of_node;
+static const void *sh_pfc_quirk_match(void)
+{
+#if defined(CONFIG_PINCTRL_PFC_R8A77950) || \
+    defined(CONFIG_PINCTRL_PFC_R8A77951)
+	const struct soc_device_attribute *match;
+	static const struct soc_device_attribute quirks[] = {
+		{
+			.soc_id = "r8a7795", .revision = "ES1.*",
+#ifdef CONFIG_PINCTRL_PFC_R8A77950
+			.data = &r8a77950_pinmux_info,
+#else
+			.data = (void *)-ENODEV,
+#endif
+		},
+		{
+			.soc_id = "r8a7795",
+#ifdef CONFIG_PINCTRL_PFC_R8A77951
+			.data = &r8a77951_pinmux_info,
+#else
+			.data = (void *)-ENODEV,
 #endif
+		},
+
+		{ /* sentinel */ }
+	};
+
+	match = soc_device_match(quirks);
+	if (match)
+		return match->data;
+#endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */
+
+	return NULL;
+}
+#endif /* CONFIG_OF */
+
+static int sh_pfc_probe(struct platform_device *pdev)
+{
 	const struct sh_pfc_soc_info *info;
 	struct sh_pfc *pfc;
 	int ret;
 
 #ifdef CONFIG_OF
-	if (np)
-		info = of_device_get_match_data(&pdev->dev);
-	else
+	if (pdev->dev.of_node) {
+		info = sh_pfc_quirk_match();
+		if (IS_ERR(info))
+			return PTR_ERR(info);
+
+		if (!info)
+			info = of_device_get_match_data(&pdev->dev);
+	} else
 #endif
 		info = (const void *)platform_get_device_id(pdev)->driver_data;
 
diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a7795-es1.c b/drivers/pinctrl/sh-pfc/pfc-r8a77950.c
similarity index 99%
rename from drivers/pinctrl/sh-pfc/pfc-r8a7795-es1.c
rename to drivers/pinctrl/sh-pfc/pfc-r8a77950.c
index ad05da8f65161c3d..04812e62f3a476a8 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a7795-es1.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a77950.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * R8A7795 ES1.x processor support - PFC hardware block.
+ * R8A77950 processor support - PFC hardware block.
  *
  * Copyright (C) 2015-2017  Renesas Electronics Corporation
  */
@@ -5562,8 +5562,8 @@ static const struct pinmux_ioctrl_reg pinmux_ioctrl_regs[] = {
 	{ /* sentinel */ },
 };
 
-static int r8a7795es1_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin,
-				     u32 *pocctrl)
+static int r8a77950_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin,
+				   u32 *pocctrl)
 {
 	int bit = -EINVAL;
 
@@ -5820,8 +5820,8 @@ static const struct pinmux_bias_reg pinmux_bias_regs[] = {
 	{ /* sentinel */ },
 };
 
-static unsigned int r8a7795es1_pinmux_get_bias(struct sh_pfc *pfc,
-					       unsigned int pin)
+static unsigned int r8a77950_pinmux_get_bias(struct sh_pfc *pfc,
+					     unsigned int pin)
 {
 	const struct pinmux_bias_reg *reg;
 	unsigned int bit;
@@ -5838,8 +5838,8 @@ static unsigned int r8a7795es1_pinmux_get_bias(struct sh_pfc *pfc,
 		return PIN_CONFIG_BIAS_PULL_DOWN;
 }
 
-static void r8a7795es1_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
-				       unsigned int bias)
+static void r8a77950_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
+				     unsigned int bias)
 {
 	const struct pinmux_bias_reg *reg;
 	u32 enable, updown;
@@ -5861,15 +5861,15 @@ static void r8a7795es1_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
 	sh_pfc_write(pfc, reg->puen, enable);
 }
 
-static const struct sh_pfc_soc_operations r8a7795es1_pinmux_ops = {
-	.pin_to_pocctrl = r8a7795es1_pin_to_pocctrl,
-	.get_bias = r8a7795es1_pinmux_get_bias,
-	.set_bias = r8a7795es1_pinmux_set_bias,
+static const struct sh_pfc_soc_operations r8a77950_pinmux_ops = {
+	.pin_to_pocctrl = r8a77950_pin_to_pocctrl,
+	.get_bias = r8a77950_pinmux_get_bias,
+	.set_bias = r8a77950_pinmux_set_bias,
 };
 
-const struct sh_pfc_soc_info r8a7795es1_pinmux_info = {
+const struct sh_pfc_soc_info r8a77950_pinmux_info = {
 	.name = "r8a77950_pfc",
-	.ops = &r8a7795es1_pinmux_ops,
+	.ops = &r8a77950_pinmux_ops,
 	.unlock_reg = 0xe6060000, /* PMMR */
 
 	.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },
diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a7795.c b/drivers/pinctrl/sh-pfc/pfc-r8a77951.c
similarity index 99%
rename from drivers/pinctrl/sh-pfc/pfc-r8a7795.c
rename to drivers/pinctrl/sh-pfc/pfc-r8a77951.c
index d3145aa135d0fdcd..256fab4b03d35621 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a7795.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a77951.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * R8A7795 ES2.0+ processor support - PFC hardware block.
+ * R8A77951 processor support - PFC hardware block.
  *
  * Copyright (C) 2015-2019 Renesas Electronics Corporation
  */
@@ -5915,7 +5915,8 @@ static const struct pinmux_ioctrl_reg pinmux_ioctrl_regs[] = {
 	{ /* sentinel */ },
 };
 
-static int r8a7795_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin, u32 *pocctrl)
+static int r8a77951_pin_to_pocctrl(struct sh_pfc *pfc,
+				   unsigned int pin, u32 *pocctrl)
 {
 	int bit = -EINVAL;
 
@@ -6172,8 +6173,8 @@ static const struct pinmux_bias_reg pinmux_bias_regs[] = {
 	{ /* sentinel */ },
 };
 
-static unsigned int r8a7795_pinmux_get_bias(struct sh_pfc *pfc,
-					    unsigned int pin)
+static unsigned int r8a77951_pinmux_get_bias(struct sh_pfc *pfc,
+					     unsigned int pin)
 {
 	const struct pinmux_bias_reg *reg;
 	unsigned int bit;
@@ -6190,8 +6191,8 @@ static unsigned int r8a7795_pinmux_get_bias(struct sh_pfc *pfc,
 		return PIN_CONFIG_BIAS_PULL_DOWN;
 }
 
-static void r8a7795_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
-				   unsigned int bias)
+static void r8a77951_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
+				     unsigned int bias)
 {
 	const struct pinmux_bias_reg *reg;
 	u32 enable, updown;
@@ -6213,29 +6214,15 @@ static void r8a7795_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
 	sh_pfc_write(pfc, reg->puen, enable);
 }
 
-static const struct soc_device_attribute r8a7795es1[] = {
-	{ .soc_id = "r8a7795", .revision = "ES1.*" },
-	{ /* sentinel */ }
+static const struct sh_pfc_soc_operations r8a77951_pinmux_ops = {
+	.pin_to_pocctrl = r8a77951_pin_to_pocctrl,
+	.get_bias = r8a77951_pinmux_get_bias,
+	.set_bias = r8a77951_pinmux_set_bias,
 };
 
-static int r8a7795_pinmux_init(struct sh_pfc *pfc)
-{
-	if (soc_device_match(r8a7795es1))
-		pfc->info = &r8a7795es1_pinmux_info;
-
-	return 0;
-}
-
-static const struct sh_pfc_soc_operations r8a7795_pinmux_ops = {
-	.init = r8a7795_pinmux_init,
-	.pin_to_pocctrl = r8a7795_pin_to_pocctrl,
-	.get_bias = r8a7795_pinmux_get_bias,
-	.set_bias = r8a7795_pinmux_set_bias,
-};
-
-const struct sh_pfc_soc_info r8a7795_pinmux_info = {
+const struct sh_pfc_soc_info r8a77951_pinmux_info = {
 	.name = "r8a77951_pfc",
-	.ops = &r8a7795_pinmux_ops,
+	.ops = &r8a77951_pinmux_ops,
 	.unlock_reg = 0xe6060000, /* PMMR */
 
 	.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h
index 640d2a4cb838804f..aa298332f00f1a8e 100644
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -318,8 +318,8 @@ extern const struct sh_pfc_soc_info r8a7791_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7792_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7793_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7794_pinmux_info;
-extern const struct sh_pfc_soc_info r8a7795_pinmux_info;
-extern const struct sh_pfc_soc_info r8a7795es1_pinmux_info;
+extern const struct sh_pfc_soc_info r8a77950_pinmux_info;
+extern const struct sh_pfc_soc_info r8a77951_pinmux_info;
 extern const struct sh_pfc_soc_info r8a77960_pinmux_info;
 extern const struct sh_pfc_soc_info r8a77961_pinmux_info;
 extern const struct sh_pfc_soc_info r8a77965_pinmux_info;
-- 
2.17.1

RE: [PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[Yoshihiro Shimoda]

Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Wednesday, December 18, 2019 3:43 AM
> 
> Despite using the same compatible values ("r8a7795"-based) because of
> historical reasons, R-Car H3 ES1.x (R8A77950) and R-Car H3 ES2.0+
> (R8A77951) are really different SoCs, with different part numbers, and
> with different Pin Function Controller blocks.
> 
> Reflect this in the pinctrl configuration, by replacing the existing
> CONFIG_PINCTRL_PFC_R8A7795 symbol by two new config symbols:
> CONFIG_PINCTRL_PFC_R8A77950 and CONFIG_PINCTRL_PFC_R8A77951.  The latter
> are selected automatically, depending on the soon-to-be-introduced
> corresponding SoC-specific config options, and on the current common
> config option, to relax dependencies.
> 
> Rename the individual pin control driver source files from
> pfc-r8a7795-es1.c to pfc-r8a77950.c, and from pfc-r8a7795.c to
> pfc-r8a77951.c, and make them truly independent.
> As both SoCs share the same compatible value, special care must be taken
> to match them to the correct pin control driver, if support for it is
> included in the running kernel.
> 
> This will allow making support for early R-Car H3 revisions optional,
> the largest share of which is taken by the pin control driver.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> Suggestions for simplifying sh_pfc_quirk_match(), or for alternative
> solutions are welcome!

I wondered if using weak attribute on both info variables could
simplify sh_pfc_quirk_match(), but such a code [1] doesn't seem better
than using #ifdef. Also, using weak attributes waste data size
if R8A77950=n and R8A77951=y for instance.

So,
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Also I tested on both R-Car H3 ES1.1 Salvator-X and R-Car H3 ES3.0 Salvator-XS,
and the kernel can boot on these boards. So,

Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Best regards,
Yoshihiro Shimoda
---
[1]
This patch below is based on the topic/r8a7795-rename-v1 branch.

diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 1ae7969..c6e86e0 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -888,27 +888,22 @@ static inline void sh_pfc_check_driver(struct platform_driver *pdrv) {}
 #endif /* !DEBUG */
 
 #ifdef CONFIG_OF
-static const void *sh_pfc_quirk_match(void)
-{
 #if defined(CONFIG_PINCTRL_PFC_R8A77950) || \
     defined(CONFIG_PINCTRL_PFC_R8A77951)
+const struct sh_pfc_soc_info __weak r8a77950_pinmux_info;
+const struct sh_pfc_soc_info __weak r8a77951_pinmux_info;
+
+static const void *sh_pfc_quirk_match(void)
+{
 	const struct soc_device_attribute *match;
 	static const struct soc_device_attribute quirks[] = {
 		{
 			.soc_id = "r8a7795", .revision = "ES1.*",
-#ifdef CONFIG_PINCTRL_PFC_R8A77950
 			.data = &r8a77950_pinmux_info,
-#else
-			.data = (void *)-ENODEV,
-#endif
 		},
 		{
 			.soc_id = "r8a7795",
-#ifdef CONFIG_PINCTRL_PFC_R8A77951
 			.data = &r8a77951_pinmux_info,
-#else
-			.data = (void *)-ENODEV,
-#endif
 		},
 
 		{ /* sentinel */ }
@@ -917,10 +912,12 @@ static const void *sh_pfc_quirk_match(void)
 	match = soc_device_match(quirks);
 	if (match)
 		return match->data;
-#endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */
 
 	return NULL;
 }
+#else
+#define sh_pfc_quirk_match()	NULL
+#endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */
 #endif /* CONFIG_OF */
 
 static int sh_pfc_probe(struct platform_device *pdev)
@@ -934,6 +931,8 @@ static int sh_pfc_probe(struct platform_device *pdev)
 		info = sh_pfc_quirk_match();
 		if (IS_ERR(info))
 			return PTR_ERR(info);
+		if (info && !info->name)
+			return -ENODEV;
 
 		if (!info)
 			info = of_device_get_match_data(&pdev->dev);

Re: [PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[Geert Uytterhoeven]

Hi Shimoda-san,

On Wed, Dec 25, 2019 at 10:46 AM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> > From: Geert Uytterhoeven, Sent: Wednesday, December 18, 2019 3:43 AM
> >
> > Despite using the same compatible values ("r8a7795"-based) because of
> > historical reasons, R-Car H3 ES1.x (R8A77950) and R-Car H3 ES2.0+
> > (R8A77951) are really different SoCs, with different part numbers, and
> > with different Pin Function Controller blocks.
> >
> > Reflect this in the pinctrl configuration, by replacing the existing
> > CONFIG_PINCTRL_PFC_R8A7795 symbol by two new config symbols:
> > CONFIG_PINCTRL_PFC_R8A77950 and CONFIG_PINCTRL_PFC_R8A77951.  The latter
> > are selected automatically, depending on the soon-to-be-introduced
> > corresponding SoC-specific config options, and on the current common
> > config option, to relax dependencies.
> >
> > Rename the individual pin control driver source files from
> > pfc-r8a7795-es1.c to pfc-r8a77950.c, and from pfc-r8a7795.c to
> > pfc-r8a77951.c, and make them truly independent.
> > As both SoCs share the same compatible value, special care must be taken
> > to match them to the correct pin control driver, if support for it is
> > included in the running kernel.
> >
> > This will allow making support for early R-Car H3 revisions optional,
> > the largest share of which is taken by the pin control driver.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> > ---
> > Suggestions for simplifying sh_pfc_quirk_match(), or for alternative
> > solutions are welcome!
>
> I wondered if using weak attribute on both info variables could
> simplify sh_pfc_quirk_match(), but such a code [1] doesn't seem better
> than using #ifdef. Also, using weak attributes waste data size
> if R8A77950=n and R8A77951=y for instance.

Thanks for the great suggestion!

The trick is to add __weak to the existing extern declarations in sh_pfc.h,
instead of adding weak empty structs.
When the structs don't exist, their addresses just become zero.

So I came up with the following (whitespace-damaged) patch, which I intend
to fold into the original, if no one objects.

diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 8da95bf22735fd7b..92f8d5f5b6930849 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -1120,19 +1120,11 @@ static const void *sh_pfc_quirk_match(void)
        static const struct soc_device_attribute quirks[] = {
                {
                        .soc_id = "r8a7795", .revision = "ES1.*",
-#ifdef CONFIG_PINCTRL_PFC_R8A77950
                        .data = &r8a77950_pinmux_info,
-#else
-                       .data = (void *)-ENODEV,
-#endif
                },
                {
                        .soc_id = "r8a7795",
-#ifdef CONFIG_PINCTRL_PFC_R8A77951
                        .data = &r8a77951_pinmux_info,
-#else
-                       .data = (void *)-ENODEV,
-#endif
                },

                { /* sentinel */ }
@@ -1140,7 +1132,7 @@ static const void *sh_pfc_quirk_match(void)

        match = soc_device_match(quirks);
        if (match)
-               return match->data;
+               return match->data ?: ERR_PTR(-ENODEV);
 #endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */

        return NULL;
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h
index aa298332f00f1a8e..d57e633e99c0ce66 100644
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -318,8 +318,8 @@ extern const struct sh_pfc_soc_info r8a7791_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7792_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7793_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7794_pinmux_info;
-extern const struct sh_pfc_soc_info r8a77950_pinmux_info;
-extern const struct sh_pfc_soc_info r8a77951_pinmux_info;
+extern const struct sh_pfc_soc_info r8a77950_pinmux_info __weak;
+extern const struct sh_pfc_soc_info r8a77951_pinmux_info __weak;
 extern const struct sh_pfc_soc_info r8a77960_pinmux_info;
 extern const struct sh_pfc_soc_info r8a77961_pinmux_info;
 extern const struct sh_pfc_soc_info r8a77965_pinmux_info;

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

RE: [PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[Yoshihiro Shimoda]

Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Thursday, December 26, 2019 11:34 PM
<snip>
> > > Suggestions for simplifying sh_pfc_quirk_match(), or for alternative
> > > solutions are welcome!
> >
> > I wondered if using weak attribute on both info variables could
> > simplify sh_pfc_quirk_match(), but such a code [1] doesn't seem better
> > than using #ifdef. Also, using weak attributes waste data size
> > if R8A77950=n and R8A77951=y for instance.
> 
> Thanks for the great suggestion!
> 
> The trick is to add __weak to the existing extern declarations in sh_pfc.h,
> instead of adding weak empty structs.
> When the structs don't exist, their addresses just become zero.

I'm happy my suggestion is useful!
# I didn't know the trick though :)

> So I came up with the following (whitespace-damaged) patch, which I intend
> to fold into the original, if no one objects.

The v2 patch [1] is better than v1!

[1]
https://patchwork.kernel.org/patch/11312733/

Best regards,
Yoshihiro Shimoda

Re: [PATCH] pinctrl: sh-pfc: Split R-Car H3 support in two independent drivers

[Geert Uytterhoeven]

Hi Shimoda-san,

Happy New Year,

On Mon, Jan 6, 2020 at 9:20 AM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> > From: Geert Uytterhoeven, Sent: Thursday, December 26, 2019 11:34 PM
> <snip>
> > > > Suggestions for simplifying sh_pfc_quirk_match(), or for alternative
> > > > solutions are welcome!
> > >
> > > I wondered if using weak attribute on both info variables could
> > > simplify sh_pfc_quirk_match(), but such a code [1] doesn't seem better
> > > than using #ifdef. Also, using weak attributes waste data size
> > > if R8A77950=n and R8A77951=y for instance.
> >
> > Thanks for the great suggestion!
> >
> > The trick is to add __weak to the existing extern declarations in sh_pfc.h,
> > instead of adding weak empty structs.
> > When the structs don't exist, their addresses just become zero.
>
> I'm happy my suggestion is useful!
> # I didn't know the trick though :)
>
> > So I came up with the following (whitespace-damaged) patch, which I intend
> > to fold into the original, if no one objects.
>
> The v2 patch [1] is better than v1!

I'm happy you like it.
Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds