mfd: mt6397: Add PMIC keys for MT6358

 Add compatible strings and interrupts for pmic keys
which serves as child device of MFD.

MT6358 has two interrupts per key: one for press, another one for
release (_R)
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/mt6397-core.c

@@ -47,6 +47,13 @@ static const struct resource mt6397_rtc_resources[] = {
 	DEFINE_RES_IRQ(MT6397_IRQ_RTC),
 };
 
+static const struct resource mt6358_keys_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MT6358_IRQ_PWRKEY, "powerkey"),
+	DEFINE_RES_IRQ_NAMED(MT6358_IRQ_HOMEKEY, "homekey"),
+	DEFINE_RES_IRQ_NAMED(MT6358_IRQ_PWRKEY_R, "powerkey_r"),
+	DEFINE_RES_IRQ_NAMED(MT6358_IRQ_HOMEKEY_R, "homekey_r"),
+};
+
 static const struct resource mt6323_keys_resources[] = {
 	DEFINE_RES_IRQ_NAMED(MT6323_IRQ_STATUS_PWRKEY, "powerkey"),
 	DEFINE_RES_IRQ_NAMED(MT6323_IRQ_STATUS_FCHRKEY, "homekey"),
@@ -98,6 +105,11 @@ static const struct mfd_cell mt6358_devs[] = {
 	}, {
 		.name = "mt6358-sound",
 		.of_compatible = "mediatek,mt6358-sound"
+	}, {
+		.name = "mt6358-keys",
+		.num_resources = ARRAY_SIZE(mt6358_keys_resources),
+		.resources = mt6358_keys_resources,
+		.of_compatible = "mediatek,mt6358-keys"
 	},
 };