target/linux/brcm2708/patches-4.4/0322-BCM270X_DT-i2c0-bcm2708-pin-group-params.patch

   1 From c451203424a277e522ea5227cefa84658615f442 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 6 May 2016 12:53:16 +0100
   4 Subject: [PATCH 322/381] BCM270X_DT: i2c0-bcm2708 - pin group params
   5
   6 Add parameters to set pin groups as a unit, setting the pin function
   7 appropriately. The parameters are:
   8   pins_0_1
   9   pins_28_29
  10   pins_44_45
  11   pins_46_47
  12
  13 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  14 ---
  15  arch/arm/boot/dts/overlays/README                  | 11 ++++--
  16  .../arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts | 43 +++++++++++++++++-----
  17  2 files changed, 42 insertions(+), 12 deletions(-)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -449,10 +449,15 @@ Params: ds1307                  Select t
  22
  23
  24  Name:   i2c0-bcm2708
  25 -Info:   Enable the i2c_bcm2708 driver for the i2c0 bus
  26 +Info:   Enable the i2c_bcm2708 driver for the i2c0 bus. Not all pin combinations
  27 +        are usable on all platforms.
  28  Load:   dtoverlay=i2c0-bcm2708,<param>=<val>
  29 -Params: sda0_pin                GPIO pin for SDA0 (0, 28 [or 44] - default 0)
  30 -        scl0_pin                GPIO pin for SCL0 (1, 29 [or 45] - default 1)
  31 +Params: sda0_pin                GPIO pin for SDA0 (deprecated - use pins_*)
  32 +        scl0_pin                GPIO pin for SCL0 (deprecated - use pins_*)
  33 +        pins_0_1                Use pins 0 and 1 (default)
  34 +        pins_28_29              Use pins 28 and 29
  35 +        pins_44_45              Use pins 44 and 45
  36 +        pins_46_47              Use pins 46 and 47
  37
  38
  39  Name:   i2c1-bcm2708
  40 --- a/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
  41 +++ b/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
  42 @@ -14,23 +14,48 @@
  43     fragment@0 {
  44        target = <&i2c0>;
  45        __overlay__ {
  46 -         pinctrl-0 = <&i2c0_pins>;
  47           status = "okay";
  48        };
  49     };
  50
  51     fragment@1 {
  52 -      target = <&gpio>;
  53 -      __overlay__ {
  54 -         i2c0_pins: i2c0 {
  55 -            brcm,pins = <0 1>;
  56 -            brcm,function = <4>; /* alt0 */
  57 -         };
  58 +      target = <&i2c0_pins>;
  59 +      frag1: __overlay__ {
  60 +         brcm,pins = <0 1>;
  61 +         brcm,function = <4>; /* alt0 */
  62 +      };
  63 +   };
  64 +
  65 +   fragment@2 {
  66 +      target = <&i2c0_pins>;
  67 +      __dormant__ {
  68 +         brcm,pins = <28 29>;
  69 +         brcm,function = <4>; /* alt0 */
  70 +      };
  71 +   };
  72 +
  73 +   fragment@3 {
  74 +      target = <&i2c0_pins>;
  75 +      __dormant__ {
  76 +         brcm,pins = <44 45>;
  77 +         brcm,function = <5>; /* alt1 */
  78 +      };
  79 +   };
  80 +
  81 +   fragment@4 {
  82 +      target = <&i2c0_pins>;
  83 +      __dormant__ {
  84 +         brcm,pins = <46 47>;
  85 +         brcm,function = <4>; /* alt0 */
  86        };
  87     };
  88
  89     __overrides__ {
  90 -      sda0_pin = <&i2c0_pins>,"brcm,pins:0";
  91 -      scl0_pin = <&i2c0_pins>,"brcm,pins:4";
  92 +      sda0_pin = <&frag1>,"brcm,pins:0";
  93 +      scl0_pin = <&frag1>,"brcm,pins:4";
  94 +      pins_0_1   = <0>,"+1-2-3-4";
  95 +      pins_28_29 = <0>,"-1+2-3-4";
  96 +      pins_44_45 = <0>,"-1-2+3-4";
  97 +      pins_46_47 = <0>,"-1-2-3+4";
  98     };
  99  };