bcm4908: add bcm_sf2 fixes for the 5th GPHY

This allows using the last integrated PHY (and so e.g. WAN port on the
ASUS GT-AC5300).

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/bcm4908/patches-5.4/700-net-dsa-bcm_sf2-enable-GPHY-for-switch-probing.patch

@@ -0,0 +1,46 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
+Date: Mon, 15 Feb 2021 23:59:26 +0100
+Subject: [PATCH] net: dsa: bcm_sf2: enable GPHY for switch probing
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GPHY needs to be enabled to succesfully probe & setup switch port
+connected to it. Otherwise hardcoding PHY OUI would be required.
+
+Before:
+brcm-sf2 80080000.switch lan4 (uninitialized): PHY [800c05c0.mdio--1:08] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan3 (uninitialized): PHY [800c05c0.mdio--1:09] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan2 (uninitialized): PHY [800c05c0.mdio--1:0a] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan1 (uninitialized): PHY [800c05c0.mdio--1:0b] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch wan (uninitialized): error -5 setting up PHY for tree 0, switch 0, port 7
+
+After:
+brcm-sf2 80080000.switch lan4 (uninitialized): PHY [800c05c0.mdio--1:08] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan3 (uninitialized): PHY [800c05c0.mdio--1:09] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan2 (uninitialized): PHY [800c05c0.mdio--1:0a] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch lan1 (uninitialized): PHY [800c05c0.mdio--1:0b] driver [Generic PHY] (irq=POLL)
+brcm-sf2 80080000.switch wan (uninitialized): PHY [800c05c0.mdio--1:0c] driver [Generic PHY] (irq=POLL)
+
+Signed-off-by: Rafał Miłecki <[email protected]>
+---
+ drivers/net/dsa/bcm_sf2.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/drivers/net/dsa/bcm_sf2.c
++++ b/drivers/net/dsa/bcm_sf2.c
+@@ -1234,10 +1234,14 @@ static int bcm_sf2_sw_probe(struct platf
+ 	rev = reg_readl(priv, REG_PHY_REVISION);
+ 	priv->hw_params.gphy_rev = rev & PHY_REVISION_MASK;
+ 
++	bcm_sf2_gphy_enable_set(priv->dev->ds, true);
++
+ 	ret = b53_switch_register(dev);
+ 	if (ret)
+ 		goto out_mdio;
+ 
++	bcm_sf2_gphy_enable_set(priv->dev->ds, false);
++
+ 	dev_info(&pdev->dev,
+ 		 "Starfighter 2 top: %x.%02x, core: %x.%02x, IRQs: %d, %d\n",
+ 		 priv->hw_params.top_rev >> 8, priv->hw_params.top_rev & 0xff,

target/linux/bcm4908/patches-5.4/701-net-dsa-bcm_sf2-keep-GPHY-enabled-on-the-BCM4908.patch

@@ -0,0 +1,30 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
+Date: Tue, 16 Feb 2021 00:06:35 +0100
+Subject: [PATCH] net: dsa: bcm_sf2: keep GPHY enabled on the BCM4908
+
+Trying to access disabled PHY results in MDIO_READ_FAIL and:
+[   11.962886] brcm-sf2 80080000.switch wan: configuring for phy/internal link mode
+[   11.972500] 8021q: adding VLAN 0 to HW filter on device wan
+[   11.980205] ------------[ cut here ]------------
+[   11.984885] WARNING: CPU: 0 PID: 7 at phy_error+0x10/0x58
+
+Signed-off-by: Rafał Miłecki <[email protected]>
+---
+ drivers/net/dsa/bcm_sf2.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/net/dsa/bcm_sf2.c
++++ b/drivers/net/dsa/bcm_sf2.c
+@@ -1248,6 +1248,12 @@ static int bcm_sf2_sw_probe(struct platf
+ 		 priv->hw_params.core_rev >> 8, priv->hw_params.core_rev & 0xff,
+ 		 priv->irq0, priv->irq1);
+ 
++	/* BCM4908 has 5 GPHYs which means bcm_sf2_port_setup() will not enable
++	 * GPHY when needed. Leave it enabled here.
++	 */
++	if (priv->type == BCM4908_DEVICE_ID)
++		bcm_sf2_gphy_enable_set(priv->dev->ds, true);
++
+ 	return 0;
+ 
+ out_mdio: