target/linux/brcm2708/patches-3.18/0053-i2c-bcm2708-add-device-tree-support.patch

   1 From 772f3f8c0c321b2817d35f48d553db023ead2d90 Mon Sep 17 00:00:00 2001
   2 From: notro <notro@tronnes.org>
   3 Date: Tue, 29 Jul 2014 11:04:49 +0200
   4 Subject: [PATCH 053/114] i2c: bcm2708: add device tree support
   5
   6 Add DT support to driver and add to .dtsi file.
   7 Setup pins in .dts file.
   8 i2c is disabled by default.
   9
  10 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  11
  12 bcm2708: don't register i2c controllers when using DT
  13
  14 The devices for the i2c controllers are in the Device Tree.
  15 Only register devices when not using DT.
  16
  17 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  18
  19 i2c: bcm2835: make driver available on ARCH_BCM2708
  20
  21 Make this driver available on ARCH_BCM2708
  22
  23 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  24 ---
  25  arch/arm/boot/dts/bcm2708-rpi-b.dts | 24 ++++++++++++++++++++++++
  26  arch/arm/boot/dts/bcm2708.dtsi      | 27 +++++++++++++++++++++++++++
  27  arch/arm/mach-bcm2708/bcm2708.c     |  6 ++++--
  28  drivers/i2c/busses/Kconfig          |  2 +-
  29  drivers/i2c/busses/i2c-bcm2708.c    | 24 ++++++++++++++++++++++++
  30  5 files changed, 80 insertions(+), 3 deletions(-)
  31
  32 --- a/arch/arm/boot/dts/bcm2708-rpi-b.dts
  33 +++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
  34 @@ -8,6 +8,8 @@
  35
  36         aliases {
  37                 spi0 = &spi0;
  38 +               i2c0 = &i2c0;
  39 +               i2c1 = &i2c1;
  40         };
  41  };
  42
  43 @@ -16,6 +18,16 @@
  44                 brcm,pins = <7 8 9 10 11>;
  45                 brcm,function = <4>; /* alt0 */
  46         };
  47 +
  48 +       i2c0_pins: i2c0 {
  49 +               brcm,pins = <0 1>;
  50 +               brcm,function = <4>;
  51 +       };
  52 +
  53 +       i2c1_pins: i2c1 {
  54 +               brcm,pins = <2 3>;
  55 +               brcm,function = <4>;
  56 +       };
  57  };
  58
  59  &spi0 {
  60 @@ -38,3 +50,15 @@
  61                 spi-max-frequency = <500000>;
  62         };
  63  };
  64 +
  65 +&i2c0 {
  66 +       pinctrl-names = "default";
  67 +       pinctrl-0 = <&i2c0_pins>;
  68 +       clock-frequency = <100000>;
  69 +};
  70 +
  71 +&i2c1 {
  72 +       pinctrl-names = "default";
  73 +       pinctrl-0 = <&i2c1_pins>;
  74 +       clock-frequency = <100000>;
  75 +};
  76 --- a/arch/arm/boot/dts/bcm2708.dtsi
  77 +++ b/arch/arm/boot/dts/bcm2708.dtsi
  78 @@ -48,6 +48,26 @@
  79                         #size-cells = <0>;
  80                         status = "disabled";
  81                 };
  82 +
  83 +               i2c0: i2c@7e205000 {
  84 +                       compatible = "brcm,bcm2708-i2c";
  85 +                       reg = <0x7e205000 0x1000>;
  86 +                       interrupts = <2 21>;
  87 +                       clocks = <&clk_i2c>;
  88 +                       #address-cells = <1>;
  89 +                       #size-cells = <0>;
  90 +                       status = "disabled";
  91 +               };
  92 +
  93 +               i2c1: i2c@7e804000 {
  94 +                       compatible = "brcm,bcm2708-i2c";
  95 +                       reg = <0x7e804000 0x1000>;
  96 +                       interrupts = <2 21>;
  97 +                       clocks = <&clk_i2c>;
  98 +                       #address-cells = <1>;
  99 +                       #size-cells = <0>;
 100 +                       status = "disabled";
 101 +               };
 102         };
 103
 104         clocks {
 105 @@ -55,6 +75,13 @@
 106                 #address-cells = <1>;
 107                 #size-cells = <0>;
 108
 109 +               clk_i2c: i2c {
 110 +                       compatible = "fixed-clock";
 111 +                       reg = <1>;
 112 +                       #clock-cells = <0>;
 113 +                       clock-frequency = <250000000>;
 114 +               };
 115 +
 116                 clk_spi: clock@2 {
 117                         compatible = "fixed-clock";
 118                         reg = <2>;
 119 --- a/arch/arm/mach-bcm2708/bcm2708.c
 120 +++ b/arch/arm/mach-bcm2708/bcm2708.c
 121 @@ -532,6 +532,7 @@ static struct spi_board_info bcm2708_spi
 122  };
 123  #endif
 124
 125 +#ifndef CONFIG_OF
 126  static struct resource bcm2708_bsc0_resources[] = {
 127         {
 128                 .start = BSC0_BASE,
 129 @@ -570,6 +571,7 @@ static struct platform_device bcm2708_bs
 130         .num_resources = ARRAY_SIZE(bcm2708_bsc1_resources),
 131         .resource = bcm2708_bsc1_resources,
 132  };
 133 +#endif
 134
 135  static struct platform_device bcm2835_hwmon_device = {
 136         .name = "bcm2835_hwmon",
 137 @@ -797,8 +799,8 @@ void __init bcm2708_init(void)
 138                 bcm_register_device(&bcm2708_alsa_devices[i]);
 139
 140         bcm_register_device_dt(&bcm2708_spi_device);
 141 -       bcm_register_device(&bcm2708_bsc0_device);
 142 -       bcm_register_device(&bcm2708_bsc1_device);
 143 +       bcm_register_device_dt(&bcm2708_bsc0_device);
 144 +       bcm_register_device_dt(&bcm2708_bsc1_device);
 145
 146         bcm_register_device(&bcm2835_hwmon_device);
 147         bcm_register_device(&bcm2835_thermal_device);
 148 --- a/drivers/i2c/busses/Kconfig
 149 +++ b/drivers/i2c/busses/Kconfig
 150 @@ -362,7 +362,7 @@ config I2C_AXXIA
 151
 152  config I2C_BCM2835
 153         tristate "Broadcom BCM2835 I2C controller"
 154 -       depends on ARCH_BCM2835
 155 +       depends on ARCH_BCM2835 || ARCH_BCM2708
 156         help
 157           If you say yes to this option, support will be included for the
 158           BCM2835 I2C controller.
 159 --- a/drivers/i2c/busses/i2c-bcm2708.c
 160 +++ b/drivers/i2c/busses/i2c-bcm2708.c
 161 @@ -26,6 +26,7 @@
 162  #include <linux/spinlock.h>
 163  #include <linux/clk.h>
 164  #include <linux/err.h>
 165 +#include <linux/of.h>
 166  #include <linux/platform_device.h>
 167  #include <linux/io.h>
 168  #include <linux/slab.h>
 169 @@ -303,6 +304,21 @@ static int bcm2708_i2c_probe(struct plat
 170         unsigned long bus_hz;
 171         u32 cdiv;
 172
 173 +       if (pdev->dev.of_node) {
 174 +               u32 bus_clk_rate;
 175 +               pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
 176 +               if (pdev->id < 0) {
 177 +                       dev_err(&pdev->dev, "alias is missing\n");
 178 +                       return -EINVAL;
 179 +               }
 180 +               if (!of_property_read_u32(pdev->dev.of_node,
 181 +                                       "clock-frequency", &bus_clk_rate))
 182 +                       baudrate = bus_clk_rate;
 183 +               else
 184 +                       dev_warn(&pdev->dev,
 185 +                               "Could not read clock-frequency property\n");
 186 +       }
 187 +
 188         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 189         if (!regs) {
 190                 dev_err(&pdev->dev, "could not get IO memory\n");
 191 @@ -336,6 +352,7 @@ static int bcm2708_i2c_probe(struct plat
 192         adap->dev.parent = &pdev->dev;
 193         adap->nr = pdev->id;
 194         strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
 195 +       adap->dev.of_node = pdev->dev.of_node;
 196
 197         switch (pdev->id) {
 198         case 0:
 199 @@ -416,10 +433,17 @@ static int bcm2708_i2c_remove(struct pla
 200         return 0;
 201  }
 202
 203 +static const struct of_device_id bcm2708_i2c_of_match[] = {
 204 +        { .compatible = "brcm,bcm2708-i2c" },
 205 +        {},
 206 +};
 207 +MODULE_DEVICE_TABLE(of, bcm2708_i2c_of_match);
 208 +
 209  static struct platform_driver bcm2708_i2c_driver = {
 210         .driver         = {
 211                 .name   = DRV_NAME,
 212                 .owner  = THIS_MODULE,
 213 +               .of_match_table = bcm2708_i2c_of_match,
 214         },
 215         .probe          = bcm2708_i2c_probe,
 216         .remove         = bcm2708_i2c_remove,