sh-pfc: Add support for sparse pin numbers

The PFC driver assumes that the value of the GPIO_PORTxxx enumeration
names are equal to the port number. This isn't true when the port number
space is sparse, as with the SH73A0.

Fix the issue by adding support for pin numbers ranges specified through
SoC data. When no range is specified the driver considers that the PFC
implements a single contiguous range for all pins.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 39 insertions, 19 deletions

diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index a60c317d988..c9e9a1d9523 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -293,29 +293,48 @@ static const struct pinconf_ops sh_pfc_pinconf_ops = {
 	.pin_config_dbg_show	= sh_pfc_pinconf_dbg_show,
 };
 
-/* pinmux ranges -> pinctrl pin descs */
-static int sh_pfc_map_gpios(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
+/* PFC ranges -> pinctrl pin descs */
+static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
 {
-	int i;
-
-	pmx->nr_pads = pfc->info->nr_pins;
+	const struct pinmux_range *ranges;
+	struct pinmux_range def_range;
+	unsigned int nr_ranges;
+	unsigned int nr_pins;
+	unsigned int i;
+
+	if (pfc->info->ranges == NULL) {
+		def_range.begin = 0;
+		def_range.end = pfc->info->nr_pins - 1;
+		ranges = &def_range;
+		nr_ranges = 1;
+	} else {
+		ranges = pfc->info->ranges;
+		nr_ranges = pfc->info->nr_ranges;
+	}
 
-	pmx->pads = devm_kzalloc(pfc->dev, sizeof(*pmx->pads) * pmx->nr_pads,
+	pmx->pads = devm_kzalloc(pfc->dev,
+				 sizeof(*pmx->pads) * pfc->info->nr_pins,
 				 GFP_KERNEL);
-	if (unlikely(!pmx->pads)) {
-		pmx->nr_pads = 0;
+	if (unlikely(!pmx->pads))
 		return -ENOMEM;
-	}
 
-	for (i = 0; i < pmx->nr_pads; i++) {
-		struct pinctrl_pin_desc *pin = pmx->pads + i;
-		struct sh_pfc_pin *gpio = pfc->info->pins + i;
+	for (i = 0, nr_pins = 0; i < nr_ranges; ++i) {
+		const struct pinmux_range *range = &ranges[i];
+		unsigned int number;
+
+		for (number = range->begin; number <= range->end;
+		     number++, nr_pins++) {
+			struct pinctrl_pin_desc *pin = &pmx->pads[nr_pins];
+			struct sh_pfc_pin *info = &pfc->info->pins[nr_pins];
 
-		pin->number = i;
-		pin->name = gpio->name;
+			pin->number = number;
+			pin->name = info->name;
+		}
 	}
 
-	return 0;
+	pfc->nr_pins = ranges[nr_ranges-1].end + 1;
+
+	return nr_ranges;
 }
 
 static int sh_pfc_map_functions(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
@@ -347,6 +366,7 @@ static int sh_pfc_map_functions(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
 int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
 {
 	struct sh_pfc_pinctrl *pmx;
+	int nr_ranges;
 	int ret;
 
 	pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL);
@@ -356,9 +376,9 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
 	pmx->pfc = pfc;
 	pfc->pinctrl = pmx;
 
-	ret = sh_pfc_map_gpios(pfc, pmx);
-	if (unlikely(ret != 0))
-		return ret;
+	nr_ranges = sh_pfc_map_pins(pfc, pmx);
+	if (unlikely(nr_ranges < 0))
+		return nr_ranges;
 
 	ret = sh_pfc_map_functions(pfc, pmx);
 	if (unlikely(ret != 0))
@@ -370,7 +390,7 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
 	pmx->pctl_desc.pmxops = &sh_pfc_pinmux_ops;
 	pmx->pctl_desc.confops = &sh_pfc_pinconf_ops;
 	pmx->pctl_desc.pins = pmx->pads;
-	pmx->pctl_desc.npins = pmx->nr_pads;
+	pmx->pctl_desc.npins = pfc->info->nr_pins;
 
 	pmx->pctl = pinctrl_register(&pmx->pctl_desc, pfc->dev, pmx);
 	if (IS_ERR(pmx->pctl))