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   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Subject: [PATCH] ARM: BCM5301X: Set 5 GHz wireless frequency limits on Netgear
   3  R8000
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   7
   8 Netgear R8000 is a tri-band home router. It has three BCM43602 chipsets
   9 two of them for 5 GHz band. Both seem the same and their firmwares
  10 report the same set of channels. The problem is due to hardware / board
  11 design there are extra limitations that should be respected.
  12
  13 First PHY should be used for U-NII-2 and U-NII-3. Third PHY should be
  14 used for U-NII-1. Using them in a different way may result in wireless
  15 not working or in noticeably reduced performance. Basic version of this
  16 info was provided by Broadcom employee, then it has been verified by me
  17 using original vendor firmware (which has limitations hardcoded in UI).
  18
  19 This patch uses recently introduced ieee80211-freq-limit property to
  20 describe these limitations at DT level.
  21
  22 Referencing PCIe devices in DT required specifying all related bridges.
  23 Below you can see (a bit complex) PCI tree from R8000 that explains all
  24 entries that I needed to put in DT.
  25
  26 0000:00:00.0            14e4:8012       Bridge Device
  27 └─ 0000:01:00.0             14e4:aa52       Network Controller
  28
  29 0001:00:00.0            14e4:8012       Bridge Device
  30 └─ 0001:01:00.0             10b5:8603       Bridge Device
  31    ├─ 0001:02:01.0  10b5:8603       Bridge Device
  32    │  └─ 0001:03:00.0     14e4:aa52       Network Controller
  33    ├─ 0001:02:02.0  10b5:8603       Bridge Device
  34    │  └─ 0001:04:00.0     14e4:aa52       Network Controller
  35    ├─ 0001:02:03.0  000d:0000       0x000000
  36    ├─ 0001:02:04.0  000d:0000       0x000000
  37    ├─ 0001:02:05.0  000d:0000       0x000000
  38    ├─ 0001:02:06.0  000d:0000       0x000000
  39    ├─ (...)
  40    ├─ 0001:02:1d.0  000d:0000       0x000000
  41    ├─ 0001:02:1e.0  000d:0000       0x000000
  42    └─ 0001:02:1f.0  000d:0000       0x000000
  43
  44 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  45 ---
  46  arch/arm/boot/dts/bcm4709-netgear-r8000.dts | 48 +++++++++++++++++++++++++++++
  47  arch/arm/boot/dts/bcm5301x.dtsi             |  8 +++++
  48  2 files changed, 56 insertions(+)
  49
  50 --- a/arch/arm/boot/dts/bcm4709-netgear-r8000.dts
  51 +++ b/arch/arm/boot/dts/bcm4709-netgear-r8000.dts
  52 @@ -108,6 +108,54 @@
  53         };
  54  };
  55
  56 +&pcie0 {
  57 +       #address-cells = <3>;
  58 +       #size-cells = <2>;
  59 +
  60 +       bridge@0,0,0 {
  61 +               reg = <0x0000 0 0 0 0>;
  62 +
  63 +               #address-cells = <3>;
  64 +               #size-cells = <2>;
  65 +
  66 +               wifi@0,1,0 {
  67 +                       reg = <0x0000 0 0 0 0>;
  68 +                       ieee80211-freq-limit = <5735000 5835000>;
  69 +               };
  70 +       };
  71 +};
  72 +
  73 +&pcie1 {
  74 +       #address-cells = <3>;
  75 +       #size-cells = <2>;
  76 +
  77 +       bridge@1,0,0 {
  78 +               reg = <0x0000 0 0 0 0>;
  79 +
  80 +               #address-cells = <3>;
  81 +               #size-cells = <2>;
  82 +
  83 +               bridge@1,1,0 {
  84 +                       reg = <0x0000 0 0 0 0>;
  85 +
  86 +                       #address-cells = <3>;
  87 +                       #size-cells = <2>;
  88 +
  89 +                       bridge@1,2,2 {
  90 +                               reg = <0x1000 0 0 0 0>;
  91 +
  92 +                               #address-cells = <3>;
  93 +                               #size-cells = <2>;
  94 +
  95 +                               wifi@1,4,0 {
  96 +                                       reg = <0x0000 0 0 0 0>;
  97 +                                       ieee80211-freq-limit = <5170000 5730000>;
  98 +                               };
  99 +                       };
 100 +               };
 101 +       };
 102 +};
 103 +
 104  &usb2 {
 105         vcc-gpio = <&chipcommon 0 GPIO_ACTIVE_HIGH>;
 106  };
 107 --- a/arch/arm/boot/dts/bcm5301x.dtsi
 108 +++ b/arch/arm/boot/dts/bcm5301x.dtsi
 109 @@ -243,6 +243,14 @@
 110                         #gpio-cells = <2>;
 111                 };
 112
 113 +               pcie0: pcie@12000 {
 114 +                       reg = <0x00012000 0x1000>;
 115 +               };
 116 +
 117 +               pcie1: pcie@13000 {
 118 +                       reg = <0x00013000 0x1000>;
 119 +               };
 120 +
 121                 usb2: usb2@21000 {
 122                         reg = <0x00021000 0x1000>;
 123