sh-pfc: Support pins not associated with a GPIO port

Pins with selectable functions but without a GPIO port can't be named
PORT_# or GP_#_#. Add a SH_PFC_PIN_NAMED macro to declare such pins in
the pinmux pins array, naming them with the PIN_ prefix followed by the
pin physical position.

In order to make sure not to register those pins as GPIOs, add a
SH_PFC_PIN_CFG_NO_GPIO pin flag to denote pins without a GPIO port.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Yusuke Goda <yusuke.goda.sx@renesas.com>

drivers/pinctrl/sh-pfc/core.c

@@ -362,7 +362,10 @@ static int sh_pfc_init_ranges(struct sh_pfc *pfc)
 		return 0;
 	}
 
-	/* Count, allocate and fill the ranges. */
+	/* Count, allocate and fill the ranges. The PFC SoC data pins array must
+	 * be sorted by pin numbers, and pins without a GPIO port must come
+	 * last.
+	 */
 	for (i = 1, nr_ranges = 1; i < pfc->info->nr_pins; ++i) {
 		if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1)
 			nr_ranges++;
@@ -378,15 +381,20 @@ static int sh_pfc_init_ranges(struct sh_pfc *pfc)
 	range->start = pfc->info->pins[0].pin;
 
 	for (i = 1; i < pfc->info->nr_pins; ++i) {
-		if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1) {
-			range->end = pfc->info->pins[i-1].pin;
-			range++;
-			range->start = pfc->info->pins[i].pin;
-		}
+		if (pfc->info->pins[i-1].pin == pfc->info->pins[i].pin - 1)
+			continue;
+
+		range->end = pfc->info->pins[i-1].pin;
+		if (!(pfc->info->pins[i-1].configs & SH_PFC_PIN_CFG_NO_GPIO))
+			pfc->nr_gpio_pins = range->end + 1;
+
+		range++;
+		range->start = pfc->info->pins[i].pin;
 	}
 
 	range->end = pfc->info->pins[i-1].pin;
-	pfc->nr_gpio_pins = range->end + 1;
+	if (!(pfc->info->pins[i-1].configs & SH_PFC_PIN_CFG_NO_GPIO))
+		pfc->nr_gpio_pins = range->end + 1;
 
 	return 0;
 }

drivers/pinctrl/sh-pfc/gpio.c

@@ -364,10 +364,16 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
 
 	pfc->gpio = chip;
 
-	/* Register the GPIO to pin mappings. */
+	/* Register the GPIO to pin mappings. As pins with GPIO ports must come
+	 * first in the ranges, skip the pins without GPIO ports by stopping at
+	 * the first range that contains such a pin.
+	 */
 	for (i = 0; i < pfc->nr_ranges; ++i) {
 		const struct sh_pfc_pin_range *range = &pfc->ranges[i];
 
+		if (range->start >= pfc->nr_gpio_pins)
+			break;
+
 		ret = gpiochip_add_pin_range(&chip->gpio_chip,
 					     dev_name(pfc->dev),
 					     range->start, range->start,

drivers/pinctrl/sh-pfc/pfc-r8a7778.c

@@ -1254,16 +1254,21 @@ static const u16 pinmux_data[] = {
 	PINMUX_IPSR_MSEL(IP10_24_22,	CAN_CLK_C,	SEL_CANCLK_C),
 };
 
-static struct sh_pfc_pin pinmux_pins[] = {
-	PINMUX_GPIO_GP_ALL(),
-};
-
 /* Pin numbers for pins without a corresponding GPIO port number are computed
  * from the row and column numbers with a 1000 offset to avoid collisions with
  * GPIO port numbers.
  */
 #define PIN_NUMBER(row, col)		(1000+((row)-1)*25+(col)-1)
 
+static struct sh_pfc_pin pinmux_pins[] = {
+	PINMUX_GPIO_GP_ALL(),
+
+	/* Pins not associated with a GPIO port */
+	SH_PFC_PIN_NAMED(3, 20, C20),
+	SH_PFC_PIN_NAMED(20, 1, T1),
+	SH_PFC_PIN_NAMED(25, 2, Y2),
+};
+
 /* - macro */
 #define SH_PFC_PINS(name, args...) \
 	static const unsigned int name ##_pins[] = { args }

drivers/pinctrl/sh-pfc/pfc-sh73a0.c

@@ -1173,6 +1173,12 @@ static const u16 pinmux_data[] = {
 #define SH73A0_PIN_IO_PU_PD(pin)	SH_PFC_PIN_CFG(pin, __IO | __PUD)
 #define SH73A0_PIN_O(pin)		SH_PFC_PIN_CFG(pin, __O)
 
+/* Pin numbers for pins without a corresponding GPIO port number are computed
+ * from the row and column numbers with a 1000 offset to avoid collisions with
+ * GPIO port numbers.
+ */
+#define PIN_NUMBER(row, col)		(1000+((row)-1)*34+(col)-1)
+
 static struct sh_pfc_pin pinmux_pins[] = {
 	/* Table 25-1 (I/O and Pull U/D) */
 	SH73A0_PIN_I_PD(0),
@@ -1444,13 +1450,10 @@ static struct sh_pfc_pin pinmux_pins[] = {
 	SH73A0_PIN_O(307),
 	SH73A0_PIN_I_PU(308),
 	SH73A0_PIN_O(309),
-};
 
-/* Pin numbers for pins without a corresponding GPIO port number are computed
- * from the row and column numbers with a 1000 offset to avoid collisions with
- * GPIO port numbers.
- */
-#define PIN_NUMBER(row, col)		(1000+((row)-1)*34+(col)-1)
+	/* Pins not associated with a GPIO port */
+	SH_PFC_PIN_NAMED(6, 26, F26),
+};
 
 /* - BSC -------------------------------------------------------------------- */
 static const unsigned int bsc_data_0_7_pins[] = {

drivers/pinctrl/sh-pfc/sh_pfc.h

@@ -26,6 +26,7 @@ enum {
 #define SH_PFC_PIN_CFG_OUTPUT		(1 << 1)
 #define SH_PFC_PIN_CFG_PULL_UP		(1 << 2)
 #define SH_PFC_PIN_CFG_PULL_DOWN	(1 << 3)
+#define SH_PFC_PIN_CFG_NO_GPIO		(1 << 31)
 
 struct sh_pfc_pin {
 	u16 pin;
@@ -266,6 +267,14 @@ struct sh_pfc_soc_info {
 		.configs = cfgs,					\
 	}
 
+/* SH_PFC_PIN_NAMED - Expand to a sh_pfc_pin entry with the given name */
+#define SH_PFC_PIN_NAMED(row, col, _name)				\
+	{								\
+		.pin = PIN_NUMBER(row, col),				\
+		.name = __stringify(PIN_##_name),			\
+		.configs = SH_PFC_PIN_CFG_NO_GPIO,			\
+	}
+
 /* PINMUX_DATA_ALL - Expand to a list of PORT_name_DATA, PORT_name_FN0,
  *		     PORT_name_OUT, PORT_name_IN marks
  */