[openwrt/openwrt] mediatek: re-add u3phy2 phy-switch patch

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/36105880ee5749d85551934d36b42f7b1fc0a640

commit 36105880ee5749d85551934d36b42f7b1fc0a640
Author: Sungbo Eo <mans0n at gorani.run>
AuthorDate: Fri May 29 22:06:35 2020 +0900

    mediatek: re-add u3phy2 phy-switch patch
    
    This patch is required for pcie at 2,0 in mt7623 to work. The patch was originally
    added in kernel 4.14, but it has not been ported to 4.19 and later.
    
    Fixes: FS#3217
    Tested-by: David Woodhouse <dwmw2 at infradead.org>
    Signed-off-by: Sungbo Eo <mans0n at gorani.run>
---
 .../0226-phy-phy-mtk-tphy-Add-hifsys-support.patch | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch b/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch
new file mode 100644
index 0000000000..f2647e8ffe
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0226-phy-phy-mtk-tphy-Add-hifsys-support.patch
@@ -0,0 +1,66 @@
+From 28f9a5e2a3f5441ab5594669ed82da11e32277a9 Mon Sep 17 00:00:00 2001
+From: Kristian Evensen <kristian.evensen at gmail.com>
+Date: Mon, 30 Apr 2018 14:38:01 +0200
+Subject: [PATCH] phy: phy-mtk-tphy: Add hifsys-support
+
+---
+ drivers/phy/mediatek/phy-mtk-tphy.c | 20 ++++++++++++++++++++
+ 1 file changed, 20 insertions(+)
+
+--- a/drivers/phy/mediatek/phy-mtk-tphy.c
++++ b/drivers/phy/mediatek/phy-mtk-tphy.c
+@@ -15,6 +15,8 @@
+ #include <linux/of_device.h>
+ #include <linux/phy/phy.h>
+ #include <linux/platform_device.h>
++#include <linux/mfd/syscon.h>
++#include <linux/regmap.h>
+ 
+ /* version V1 sub-banks offset base address */
+ /* banks shared by multiple phys */
+@@ -263,6 +265,9 @@
+ #define RG_CDR_BIRLTD0_GEN3_MSK		GENMASK(4, 0)
+ #define RG_CDR_BIRLTD0_GEN3_VAL(x)	(0x1f & (x))
+ 
++#define HIF_SYSCFG1			0x14
++#define HIF_SYSCFG1_PHY2_MASK		(0x3 << 20)
++
+ enum mtk_phy_version {
+ 	MTK_PHY_V1 = 1,
+ 	MTK_PHY_V2,
+@@ -310,6 +315,7 @@ struct mtk_tphy {
+ 	struct clk *u3phya_ref;	/* reference clock of usb3 anolog phy */
+ 	const struct mtk_phy_pdata *pdata;
+ 	struct mtk_phy_instance **phys;
++	struct regmap *hif;
+ 	int nphys;
+ 	int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
+ 	int src_coef; /* coefficient for slew rate calibrate */
+@@ -629,6 +635,10 @@ static void pcie_phy_instance_init(struc
+ 	if (tphy->pdata->version != MTK_PHY_V1)
+ 		return;
+ 
++	if (tphy->hif)
++		regmap_update_bits(tphy->hif, HIF_SYSCFG1,
++				   HIF_SYSCFG1_PHY2_MASK, 0);
++
+ 	tmp = readl(u3_banks->phya + U3P_U3_PHYA_DA_REG0);
+ 	tmp &= ~(P3A_RG_XTAL_EXT_PE1H | P3A_RG_XTAL_EXT_PE2H);
+ 	tmp |= P3A_RG_XTAL_EXT_PE1H_VAL(0x2) | P3A_RG_XTAL_EXT_PE2H_VAL(0x2);
+@@ -1114,6 +1124,16 @@ static int mtk_tphy_probe(struct platfor
+ 		&tphy->src_ref_clk);
+ 	device_property_read_u32(dev, "mediatek,src-coef", &tphy->src_coef);
+ 
++	if (of_find_property(np, "mediatek,phy-switch", NULL)) {
++		tphy->hif = syscon_regmap_lookup_by_phandle(np,
++							    "mediatek,phy-switch");
++		if (IS_ERR(tphy->hif)) {
++			dev_err(&pdev->dev,
++				"missing \"mediatek,phy-switch\" phandle\n");
++			return PTR_ERR(tphy->hif);
++		}
++	}
++
+ 	port = 0;
+ 	for_each_child_of_node(np, child_np) {
+ 		struct mtk_phy_instance *instance;