[PATCH 3/7] mfd: mt6397: keys: use named IRQs instead of index

[Mattijs Korpershoek <mkorpershoek@baylibre.com>]

For some compatible pmics (such as MT6358), there are two IRQs per
physical key: one for press event, another for release event.

Currently, the mtk-pmic-keys driver assumes that each key only has one
IRQ. The key index and the RES_IRQ resource index have a 1/1 mapping.

This won't work for MT6358, as we have multiple resources (2) for one key.

To prepare mtk-pmic-keys to support MT6358, retrieve IRQs by name
instead of by index.

Note: The keys_resources are not part of the device-tree bindings so
this won't break any DT schemas.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
---
 drivers/input/keyboard/mtk-pmic-keys.c | 7 +++++--
 drivers/mfd/mt6397-core.c              | 8 ++++----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/input/keyboard/mtk-pmic-keys.c b/drivers/input/keyboard/mtk-pmic-keys.c
index 12c449eed026..b877bf98db38 100644
--- a/drivers/input/keyboard/mtk-pmic-keys.c
+++ b/drivers/input/keyboard/mtk-pmic-keys.c
@@ -241,6 +241,7 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 	unsigned int keycount;
 	struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *node = pdev->dev.of_node, *child;
+	static const char *const irqnames[] = { "powerkey", "homekey" };
 	struct mtk_pmic_keys *keys;
 	const struct mtk_pmic_regs *mtk_pmic_regs;
 	struct input_dev *input_dev;
@@ -271,7 +272,8 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 	input_dev->id.version = 0x0001;
 
 	keycount = of_get_available_child_count(node);
-	if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
+	if (keycount > MTK_PMIC_MAX_KEY_COUNT ||
+	    keycount > ARRAY_SIZE(irqnames)) {
 		dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
 		return -EINVAL;
 	}
@@ -279,7 +281,8 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 	for_each_child_of_node(node, child) {
 		keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
 
-		keys->keys[index].irq = platform_get_irq(pdev, index);
+		keys->keys[index].irq =
+			platform_get_irq_byname(pdev, irqnames[index]);
 		if (keys->keys[index].irq < 0) {
 			of_node_put(child);
 			return keys->keys[index].irq;
diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
index 7518d74c3b4c..8738b5524783 100644
--- a/drivers/mfd/mt6397-core.c
+++ b/drivers/mfd/mt6397-core.c
@@ -46,13 +46,13 @@ static const struct resource mt6397_rtc_resources[] = {
 };
 
 static const struct resource mt6323_keys_resources[] = {
-	DEFINE_RES_IRQ(MT6323_IRQ_STATUS_PWRKEY),
-	DEFINE_RES_IRQ(MT6323_IRQ_STATUS_FCHRKEY),
+	DEFINE_RES_IRQ_NAMED(MT6323_IRQ_STATUS_PWRKEY, "powerkey"),
+	DEFINE_RES_IRQ_NAMED(MT6323_IRQ_STATUS_FCHRKEY, "homekey"),
 };
 
 static const struct resource mt6397_keys_resources[] = {
-	DEFINE_RES_IRQ(MT6397_IRQ_PWRKEY),
-	DEFINE_RES_IRQ(MT6397_IRQ_HOMEKEY),
+	DEFINE_RES_IRQ_NAMED(MT6397_IRQ_PWRKEY, "powerkey"),
+	DEFINE_RES_IRQ_NAMED(MT6397_IRQ_HOMEKEY, "homekey"),
 };
 
 static const struct resource mt6323_pwrc_resources[] = {
-- 
2.27.0