kernel: add more dsa b53 pending patches

These patches have now received a positive review upstream, so let's add them
to pending patches.

776-net-dsa-b53-mmap-add-phy-ops.patch:
  This is mostly bmips/bcm63xx-specific to get external switches working
  without hanging the device when accessing certain registers.

777-net-dsa-b53-mdio-add-support-for-BCM53134:
  This adds support for BCM53134 switch on DSA B53, so any target using DSA B53
  can benefit from it.

Also fix sercomm-h500-s external switch IMP port phy-mode.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 118 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.15/776-net-dsa-b53-mmap-add-phy-ops.patch b/target/linux/generic/pending-5.15/776-net-dsa-b53-mmap-add-phy-ops.patch
new file mode 100644
index 0000000000..786e07c8bb
--- /dev/null
+++ b/target/linux/generic/pending-5.15/776-net-dsa-b53-mmap-add-phy-ops.patch
@@ -0,0 +1,118 @@
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+Subject: [PATCH] net: dsa: b53: mmap: add phy ops
+Date: Thu, 23 Mar 2023 20:48:41 +0100
+Message-Id: <20230323194841.1431878-1-noltari@gmail.com>
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+
+Implement phy_read16() and phy_write16() ops for B53 MMAP to avoid accessing
+B53_PORT_MII_PAGE registers which hangs the device.
+This access should be done through the MDIO Mux bus controller.
+
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ drivers/net/dsa/b53/b53_mmap.c | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+--- a/drivers/net/dsa/b53/b53_mmap.c
++++ b/drivers/net/dsa/b53/b53_mmap.c
+@@ -216,6 +216,18 @@ static int b53_mmap_write64(struct b53_d
+ 	return 0;
+ }
+ 
++static int b53_mmap_phy_read16(struct b53_device *dev, int addr, int reg,
++			       u16 *value)
++{
++	return -EIO;
++}
++
++static int b53_mmap_phy_write16(struct b53_device *dev, int addr, int reg,
++				u16 value)
++{
++	return -EIO;
++}
++
+ static const struct b53_io_ops b53_mmap_ops = {
+ 	.read8 = b53_mmap_read8,
+ 	.read16 = b53_mmap_read16,
+@@ -227,6 +239,8 @@ static const struct b53_io_ops b53_mmap_
+ 	.write32 = b53_mmap_write32,
+ 	.write48 = b53_mmap_write48,
+ 	.write64 = b53_mmap_write64,
++	.phy_read16 = b53_mmap_phy_read16,
++	.phy_write16 = b53_mmap_phy_write16,
+ };
+ 
+ static int b53_mmap_probe_of(struct platform_device *pdev,