target/linux/bcm53xx/patches-5.15/030-v5.15-0005-ARM-dts-NSP-Move-USB3-PHY-to-internal-MDIO-bus.patch

   1 From 1c615401bddb1be21e1d375aaa071680f40f1ae2 Mon Sep 17 00:00:00 2001
   2 From: Matthew Hagan <mnhagan88@gmail.com>
   3 Date: Sun, 13 Jun 2021 10:46:37 +0100
   4 Subject: [PATCH] ARM: dts: NSP: Move USB3 PHY to internal MDIO bus
   5
   6 This patch largely replicates Vivek Unune's patch "ARM: dts:
   7 BCM5301X:Make usb3 phy use mdio phy driver"[1] for the NSP platform,
   8 whereby we need to create an mdio-mux to facilitate switches
   9 configured via external MDIO, in this case on the Meraki MX65.
  10
  11 However in doing so, we are creating an overlap with usb3_phy's
  12 ccb-mii range. To resolve this, usb3_phy should be moved to a child
  13 node of the internal MDIO bus. The result is heavily based upon Vivek's
  14 patch. This has also been cross-referenced with Yendapally Reddy's
  15 earlier work which utilised the subsequently dropped brcm,nsp-usb3-phy
  16 driver: "[PATCH v2 4/4] arm: dts: nsp: Add USB nodes to device tree"
  17 [2]. Finally, this change provides conformance to the bcm-ns-usb3-phy
  18 documentation, utilising the required usb3-dmp-syscon property. Note
  19 that support for the deprecated ccb-mii bindings has been dropped as of
  20 "phy: phy-bcm-ns-usb3: drop support for deprecated DT binding"[3].
  21
  22 [1] https://lore.kernel.org/patchwork/patch/933971/
  23 [2] https://www.spinics.net/lists/arm-kernel/msg555132.html
  24 [3] https://lore.kernel.org/linux-devicetree/20201113113423.9466-1-zajec5@gmail.com/
  25
  26 Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
  27 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
  28 ---
  29  arch/arm/boot/dts/bcm-nsp.dtsi | 38 +++++++++++++++++++++++++++-------
  30  1 file changed, 31 insertions(+), 7 deletions(-)
  31
  32 --- a/arch/arm/boot/dts/bcm-nsp.dtsi
  33 +++ b/arch/arm/boot/dts/bcm-nsp.dtsi
  34 @@ -370,6 +370,35 @@
  35                         #address-cells = <1>;
  36                 };
  37
  38 +               mdio-mux@32000 {
  39 +                       compatible = "mdio-mux-mmioreg";
  40 +                       reg = <0x32000 0x4>;
  41 +                       mux-mask = <0x200>;
  42 +                       #address-cells = <1>;
  43 +                       #size-cells = <0>;
  44 +                       mdio-parent-bus = <&mdio>;
  45 +
  46 +                       mdio_int: mdio@0 {
  47 +                               reg = <0x0>;
  48 +                               #address-cells = <1>;
  49 +                               #size-cells = <0>;
  50 +
  51 +                               usb3_phy: usb3-phy@10 {
  52 +                                       compatible = "brcm,ns-bx-usb3-phy";
  53 +                                       reg = <0x10>;
  54 +                                       usb3-dmp-syscon = <&usb3_dmp>;
  55 +                                       #phy-cells = <0>;
  56 +                                       status = "disabled";
  57 +                               };
  58 +                       };
  59 +
  60 +                       mdio_ext: mdio@200 {
  61 +                               reg = <0x200>;
  62 +                               #address-cells = <1>;
  63 +                               #size-cells = <0>;
  64 +                       };
  65 +               };
  66 +
  67                 rng: rng@33000 {
  68                         compatible = "brcm,bcm-nsp-rng";
  69                         reg = <0x33000 0x14>;
  70 @@ -528,13 +557,8 @@
  71                         };
  72                 };
  73
  74 -               usb3_phy: usb3-phy@104000 {
  75 -                       compatible = "brcm,ns-bx-usb3-phy";
  76 -                       reg = <0x104000 0x1000>,
  77 -                             <0x032000 0x1000>;
  78 -                       reg-names = "dmp", "ccb-mii";
  79 -                       #phy-cells = <0>;
  80 -                       status = "disabled";
  81 +               usb3_dmp: syscon@104000 {
  82 +                       reg = <0x104000 0x1000>;
  83                 };
  84         };
  85