target/linux/brcm2708/patches-3.18/0052-spi-bcm2708-add-device-tree-support.patch

   1 From 5de6baef9b5d9e3a84e0c3752cfb7eaef2eb1a0f Mon Sep 17 00:00:00 2001
   2 From: notro <notro@tronnes.org>
   3 Date: Sun, 27 Jul 2014 20:12:58 +0200
   4 Subject: [PATCH 052/114] spi: bcm2708: add device tree support
   5
   6 Add DT support to driver and add to .dtsi file.
   7 Setup pins and spidev in .dts file.
   8 SPI is disabled by default.
   9
  10 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  11
  12 BCM2708: don't register SPI controller when using DT
  13
  14 The device for the SPI controller is in the Device Tree.
  15 Only register the device when not using DT.
  16
  17 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  18
  19 spi: 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 bcm2708: Remove the prohibition on mixing SPIDEV and DT
  26 ---
  27  arch/arm/boot/dts/bcm2708-rpi-b.dts | 32 ++++++++++++++++++++++++++++++++
  28  arch/arm/boot/dts/bcm2708.dtsi      | 18 ++++++++++++++++++
  29  arch/arm/mach-bcm2708/bcm2708.c     | 19 ++++++++++++++++---
  30  drivers/spi/Kconfig                 |  2 +-
  31  drivers/spi/spi-bcm2708.c           |  8 ++++++++
  32  5 files changed, 75 insertions(+), 4 deletions(-)
  33
  34 --- a/arch/arm/boot/dts/bcm2708-rpi-b.dts
  35 +++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
  36 @@ -5,4 +5,36 @@
  37  / {
  38         compatible = "brcm,bcm2708";
  39         model = "Raspberry Pi";
  40 +
  41 +       aliases {
  42 +               spi0 = &spi0;
  43 +       };
  44 +};
  45 +
  46 +&gpio {
  47 +       spi0_pins: spi0_pins {
  48 +               brcm,pins = <7 8 9 10 11>;
  49 +               brcm,function = <4>; /* alt0 */
  50 +       };
  51 +};
  52 +
  53 +&spi0 {
  54 +       pinctrl-names = "default";
  55 +       pinctrl-0 = <&spi0_pins>;
  56 +
  57 +       spidev@0{
  58 +               compatible = "spidev";
  59 +               reg = <0>;      /* CE0 */
  60 +               #address-cells = <1>;
  61 +               #size-cells = <0>;
  62 +               spi-max-frequency = <500000>;
  63 +       };
  64 +
  65 +       spidev@1{
  66 +               compatible = "spidev";
  67 +               reg = <1>;      /* CE1 */
  68 +               #address-cells = <1>;
  69 +               #size-cells = <0>;
  70 +               spi-max-frequency = <500000>;
  71 +       };
  72  };
  73 --- a/arch/arm/boot/dts/bcm2708.dtsi
  74 +++ b/arch/arm/boot/dts/bcm2708.dtsi
  75 @@ -38,11 +38,29 @@
  76                         interrupt-controller;
  77                         #interrupt-cells = <2>;
  78                 };
  79 +
  80 +               spi0: spi@7e204000 {
  81 +                       compatible = "brcm,bcm2708-spi";
  82 +                       reg = <0x7e204000 0x1000>;
  83 +                       interrupts = <2 22>;
  84 +                       clocks = <&clk_spi>;
  85 +                       #address-cells = <1>;
  86 +                       #size-cells = <0>;
  87 +                       status = "disabled";
  88 +               };
  89         };
  90
  91         clocks {
  92                 compatible = "simple-bus";
  93                 #address-cells = <1>;
  94                 #size-cells = <0>;
  95 +
  96 +               clk_spi: clock@2 {
  97 +                       compatible = "fixed-clock";
  98 +                       reg = <2>;
  99 +                       #clock-cells = <0>;
 100 +                       clock-output-names = "spi";
 101 +                       clock-frequency = <250000000>;
 102 +               };
 103         };
 104  };
 105 --- a/arch/arm/mach-bcm2708/bcm2708.c
 106 +++ b/arch/arm/mach-bcm2708/bcm2708.c
 107 @@ -486,6 +486,7 @@ static struct platform_device bcm2708_al
 108                },
 109  };
 110
 111 +#ifndef CONFIG_OF
 112  static struct resource bcm2708_spi_resources[] = {
 113         {
 114                 .start = SPI0_BASE,
 115 @@ -509,6 +510,7 @@ static struct platform_device bcm2708_sp
 116                 .dma_mask = &bcm2708_spi_dmamask,
 117                 .coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON)},
 118  };
 119 +#endif
 120
 121  #ifdef CONFIG_BCM2708_SPIDEV
 122  static struct spi_board_info bcm2708_spi_devices[] = {
 123 @@ -670,6 +672,16 @@ int __init bcm_register_device(struct pl
 124         return ret;
 125  }
 126
 127 +/*
 128 + * Use this macro for platform devices that are present in the Device Tree.
 129 + * This way the device is only added on non-DT builds.
 130 + */
 131 +#ifdef CONFIG_OF
 132 +#define bcm_register_device_dt(pdev)
 133 +#else
 134 +#define bcm_register_device_dt(pdev) bcm_register_device(pdev)
 135 +#endif
 136 +
 137  int calc_rsts(int partition)
 138  {
 139         return PM_PASSWORD |
 140 @@ -784,7 +796,7 @@ void __init bcm2708_init(void)
 141         for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
 142                 bcm_register_device(&bcm2708_alsa_devices[i]);
 143
 144 -       bcm_register_device(&bcm2708_spi_device);
 145 +       bcm_register_device_dt(&bcm2708_spi_device);
 146         bcm_register_device(&bcm2708_bsc0_device);
 147         bcm_register_device(&bcm2708_bsc1_device);
 148
 149 @@ -824,8 +836,9 @@ void __init bcm2708_init(void)
 150         system_serial_low = serial;
 151
 152  #ifdef CONFIG_BCM2708_SPIDEV
 153 -       spi_register_board_info(bcm2708_spi_devices,
 154 -                       ARRAY_SIZE(bcm2708_spi_devices));
 155 +       if (!use_dt)
 156 +           spi_register_board_info(bcm2708_spi_devices,
 157 +                                   ARRAY_SIZE(bcm2708_spi_devices));
 158  #endif
 159  }
 160
 161 --- a/drivers/spi/Kconfig
 162 +++ b/drivers/spi/Kconfig
 163 @@ -77,7 +77,7 @@ config SPI_ATMEL
 164
 165  config SPI_BCM2835
 166         tristate "BCM2835 SPI controller"
 167 -       depends on ARCH_BCM2835 || COMPILE_TEST
 168 +       depends on ARCH_BCM2835 || ARCH_BCM2708 || COMPILE_TEST
 169         help
 170           This selects a driver for the Broadcom BCM2835 SPI master.
 171
 172 --- a/drivers/spi/spi-bcm2708.c
 173 +++ b/drivers/spi/spi-bcm2708.c
 174 @@ -512,6 +512,7 @@ static int bcm2708_spi_probe(struct plat
 175         master->setup = bcm2708_spi_setup;
 176         master->transfer = bcm2708_spi_transfer;
 177         master->cleanup = bcm2708_spi_cleanup;
 178 +       master->dev.of_node = pdev->dev.of_node;
 179         platform_set_drvdata(pdev, master);
 180
 181         bs = spi_master_get_devdata(master);
 182 @@ -596,10 +597,17 @@ static int bcm2708_spi_remove(struct pla
 183         return 0;
 184  }
 185
 186 +static const struct of_device_id bcm2708_spi_match[] = {
 187 +       { .compatible = "brcm,bcm2708-spi", },
 188 +       {}
 189 +};
 190 +MODULE_DEVICE_TABLE(of, bcm2708_spi_match);
 191 +
 192  static struct platform_driver bcm2708_spi_driver = {
 193         .driver         = {
 194                 .name   = DRV_NAME,
 195                 .owner  = THIS_MODULE,
 196 +               .of_match_table = bcm2708_spi_match,
 197         },
 198         .probe          = bcm2708_spi_probe,
 199         .remove         = bcm2708_spi_remove,