From e5a4ab6a55e2308aad546b594c0d8e5b71d21be9 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 13 Apr 2020 14:18:20 +0300
Subject: [PATCH] pinctrl: intel: Introduce common flags for GPIO mapping scheme
Git-commit: e5a4ab6a55e2308aad546b594c0d8e5b71d21be9
Patch-mainline: v5.8-rc1
References: jsc#SLE-12984

Few drivers are using the same flag to tell Intel pin control core
how to interpret GPIO base.

Provide a generic flags so all drivers can use.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/pinctrl/intel/pinctrl-intel.c |   19 +++++++++++++------
 drivers/pinctrl/intel/pinctrl-intel.h |   14 ++++++++++++--
 2 files changed, 25 insertions(+), 8 deletions(-)

--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -831,7 +831,7 @@ static int intel_gpio_to_pin(struct inte
 		for (j = 0; j < comm->ngpps; j++) {
 			const struct intel_padgroup *pgrp = &comm->gpps[j];
 
-			if (pgrp->gpio_base < 0)
+			if (pgrp->gpio_base == INTEL_GPIO_BASE_NOMAP)
 				continue;
 
 			if (offset >= pgrp->gpio_base &&
@@ -1168,7 +1168,7 @@ static int intel_gpio_add_pin_ranges(str
 	for (i = 0; i < community->ngpps; i++) {
 		const struct intel_padgroup *gpp = &community->gpps[i];
 
-		if (gpp->gpio_base < 0)
+		if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP)
 			continue;
 
 		ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev),
@@ -1192,7 +1192,7 @@ static unsigned intel_gpio_ngpio(const s
 		for (j = 0; j < community->ngpps; j++) {
 			const struct intel_padgroup *gpp = &community->gpps[j];
 
-			if (gpp->gpio_base < 0)
+			if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP)
 				continue;
 
 			if (gpp->gpio_base + gpp->size > ngpio)
@@ -1297,8 +1297,15 @@ static int intel_pinctrl_add_padgroups(s
 		if (gpps[i].size > 32)
 			return -EINVAL;
 
-		if (!gpps[i].gpio_base)
-			gpps[i].gpio_base = gpps[i].base;
+		/* Special treatment for GPIO base */
+		switch (gpps[i].gpio_base) {
+			case INTEL_GPIO_BASE_MATCH:
+				gpps[i].gpio_base = gpps[i].base;
+				break;
+			case INTEL_GPIO_BASE_NOMAP:
+			default:
+				break;
+		}
 
 		gpps[i].padown_num = padown_num;
 
@@ -1617,7 +1624,7 @@ static void intel_restore_hostown(struct
 	struct device *dev = pctrl->dev;
 	u32 requested;
 
-	if (padgrp->gpio_base < 0)
+	if (padgrp->gpio_base == INTEL_GPIO_BASE_NOMAP)
 		return;
 
 	requested = intel_gpio_is_requested(&pctrl->chip, padgrp->gpio_base, padgrp->size);
--- a/drivers/pinctrl/intel/pinctrl-intel.h
+++ b/drivers/pinctrl/intel/pinctrl-intel.h
@@ -50,8 +50,7 @@ struct intel_function {
  * @reg_num: GPI_IS register number
  * @base: Starting pin of this group
  * @size: Size of this group (maximum is 32).
- * @gpio_base: Starting GPIO base of this group (%0 if matches with @base,
- *	       and %-1 if no GPIO mapping should be created)
+ * @gpio_base: Starting GPIO base of this group
  * @padown_num: PAD_OWN register number (assigned by the core driver)
  *
  * If pad groups of a community are not the same size, use this structure
@@ -66,6 +65,17 @@ struct intel_padgroup {
 };
 
 /**
+ * enum - Special treatment for GPIO base in pad group
+ *
+ * @INTEL_GPIO_BASE_NOMAP:	no GPIO mapping should be created
+ * @INTEL_GPIO_BASE_MATCH:	matches with starting pin number
+ */
+enum {
+	INTEL_GPIO_BASE_NOMAP	= -1,
+	INTEL_GPIO_BASE_MATCH	= 0,
+};
+
+/**
  * struct intel_community - Intel pin community description
  * @barno: MMIO BAR number where registers for this community reside
  * @padown_offset: Register offset of PAD_OWN register from @regs. If %0