[openwrt/openwrt] ramips: allow USB power control on TP-Link MR3020v3

[LEDE Commits]

mans0n pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/9d06f1a618530ecfbd945cf3fb46b610f9b52c86

commit 9d06f1a618530ecfbd945cf3fb46b610f9b52c86
Author: Dmitry Chigiryov <dmitry.chigiryov at ya.ru>
AuthorDate: Fri Feb 25 12:41:12 2022 +0300

    ramips: allow USB power control on TP-Link MR3020v3
    
    By switching EPHY_LED4_N_JTRST_N from EPHY_LED4_N to GPIO#39
    we can control USB port power an all current revisions of MR3020v3.
    It was not a thing on some first revisions, pin was unused.
    But for now on all current MR3020v3 boards EPHY_LED4_N_JTRST_N pin
    is connected to USB power key.
    Also it was not used as EPHY indicator on any revision of the board.
    
    Signed-off-by: Dmitry Chigiryov <dmitry.chigiryov at ya.ru>
    [changed author address (used SoB one)]
    Signed-off-by: Sungbo Eo <mans0n at gorani.run>
---
 target/linux/ramips/dts/mt7628an_tplink_tl-mr3020-v3.dts | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/target/linux/ramips/dts/mt7628an_tplink_tl-mr3020-v3.dts b/target/linux/ramips/dts/mt7628an_tplink_tl-mr3020-v3.dts
index 8860e53efc..3ffa732541 100644
--- a/target/linux/ramips/dts/mt7628an_tplink_tl-mr3020-v3.dts
+++ b/target/linux/ramips/dts/mt7628an_tplink_tl-mr3020-v3.dts
@@ -75,6 +75,17 @@
 			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
 		};
 	};
+
+	gpio_export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+
+		usbpower {
+			gpio-export,name = "usbpower";
+			gpio-export,output = <1>;
+			gpios = <&gpio 39 GPIO_ACTIVE_HIGH>;
+		};
+	};
 };
 
 &spi0 {
@@ -120,7 +131,7 @@
 
 &state_default {
 	gpio {
-		groups = "i2s", "refclk", "wdt", "p2led_an", "p1led_an", "p0led_an", "wled_an";
+		groups = "i2s", "refclk", "wdt", "p4led_an", "p2led_an", "p1led_an", "p0led_an", "wled_an";
 		function = "gpio";
 	};
 };