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0106-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch

0106-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch 3.2 KB
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  1. From 75803fb0ecf8fcb8e2803feb8ee4b8e3d274c835 Mon Sep 17 00:00:00 2001
    2. 

  2. From: Alistair Buxton <a.j.buxton@gmail.com>
    3. 

  3. Date: Sun, 1 Nov 2015 22:27:56 +0000
    4. 

  4. Subject: [PATCH 106/381] Build i2c_gpio module and add a device tree overlay
    5. 

  5.  to configure it.
    6. 

  6. 

  7. ---
    8. 

  8.  arch/arm/boot/dts/overlays/Makefile             |  1 +
    9. 

  9.  arch/arm/boot/dts/overlays/README               | 13 +++++++++++-
    10. 

  10.  arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 28 +++++++++++++++++++++++++
    11. 

  11.  arch/arm/configs/bcm2709_defconfig              |  1 +
    12. 

  12.  arch/arm/configs/bcmrpi_defconfig               |  1 +
    13. 

  13.  5 files changed, 43 insertions(+), 1 deletion(-)
    14. 

  14.  create mode 100644 arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
    15. 

  15. 

  16. --- a/arch/arm/boot/dts/overlays/Makefile
    17. 

  17. +++ b/arch/arm/boot/dts/overlays/Makefile
    18. 

  18. @@ -25,6 +25,7 @@ dtb-$(RPI_DT_OVERLAYS) += hifiberry-digi
    19. 

  19.  dtb-$(RPI_DT_OVERLAYS) += hy28a-overlay.dtb
    20. 

  20.  dtb-$(RPI_DT_OVERLAYS) += hy28b-overlay.dtb
    21. 

  21.  dtb-$(RPI_DT_OVERLAYS) += i2c-rtc-overlay.dtb
    22. 

  22. +dtb-$(RPI_DT_OVERLAYS) += i2c-gpio-overlay.dtb
    23. 

  23.  dtb-$(RPI_DT_OVERLAYS) += i2s-mmap-overlay.dtb
    24. 

  24.  dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-overlay.dtb
    25. 

  25.  dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
    26. 

  26. --- a/arch/arm/boot/dts/overlays/README
    27. 

  27. +++ b/arch/arm/boot/dts/overlays/README
    28. 

  28. @@ -287,9 +287,20 @@ Params: speed                    Display
    29. 

  29.          ledgpio                  GPIO used to control backlight
    30. 

  30.  
    31. 

  31.  
    32. 

  32. +Name:   i2c-gpio
    33. 

  33. +Info:   Adds support for software i2c controller on gpio pins
    34. 

  34. +Load:   dtoverlay=i2c-gpio,<param>=<val>
    35. 

  35. +Params: i2c_gpio_sda             GPIO used for I2C data (default "23")
    36. 

  36. +
    37. 

  37. +        i2c_gpio_scl             GPIO used for I2C clock (default "24")
    38. 

  38. +
    39. 

  39. +        i2c_gpio_delay_us        Clock delay in microseconds
    40. 

  40. +                                 (default "2" = ~100kHz)
    41. 

  41. +
    42. 

  42. +
    43. 

  43.  Name:   i2c-rtc
    44. 

  44.  Info:   Adds support for a number of I2C Real Time Clock devices
    45. 

  45. -Load:   dtoverlay=i2c-rtc,<param>
    46. 

  46. +Load:   dtoverlay=i2c-rtc,<param>=<val>
    47. 

  47.  Params: ds1307                   Select the DS1307 device
    48. 

  48.  
    49. 

  49.          ds3231                   Select the DS3231 device
    50. 

  50. --- /dev/null
    51. 

  51. +++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
    52. 

  52. @@ -0,0 +1,28 @@
    53. 

  53. +// Overlay for i2c_gpio bitbanging host bus.
    54. 

  54. +/dts-v1/;
    55. 

  55. +/plugin/;
    56. 

  56. +
    57. 

  57. +/ {
    58. 

  58. +	compatible = "brcm,bcm2708";
    59. 

  59. +
    60. 

  60. +	fragment@0 {
    61. 

  61. +		target-path = "/";
    62. 

  62. +		__overlay__ {
    63. 

  63. +			i2c_gpio: i2c@0 {
    64. 

  64. +				compatible = "i2c-gpio";
    65. 

  65. +				gpios = <&gpio 23 0 /* sda */
    66. 

  66. +					 &gpio 24 0 /* scl */
    67. 

  67. +					>;
    68. 

  68. +				i2c-gpio,delay-us = <2>;        /* ~100 kHz */
    69. 

  69. +				#address-cells = <1>;
    70. 

  70. +				#size-cells = <0>;
    71. 

  71. +			};
    72. 

  72. +		};
    73. 

  73. +	};
    74. 

  74. +	__overrides__ {
    75. 

  75. +		i2c_gpio_sda = <&i2c_gpio>,"gpios:4";
    76. 

  76. +		i2c_gpio_scl = <&i2c_gpio>,"gpios:16";
    77. 

  77. +		i2c_gpio_delay_us = <&i2c_gpio>,"i2c-gpio,delay-us:0";
    78. 

  78. +	};
    79. 

  79. +};
    80. 

  80. +
    81. 

  81. --- a/arch/arm/configs/bcm2709_defconfig
    82. 

  82. +++ b/arch/arm/configs/bcm2709_defconfig
    83. 

  83. @@ -595,6 +595,7 @@ CONFIG_RAW_DRIVER=y
    84. 

  84.  CONFIG_I2C=y
    85. 

  85.  CONFIG_I2C_CHARDEV=m
    86. 

  86.  CONFIG_I2C_BCM2708=m
    87. 

  87. +CONFIG_I2C_GPIO=m
    88. 

  88.  CONFIG_SPI=y
    89. 

  89.  CONFIG_SPI_BCM2835=m
    90. 

  90.  CONFIG_SPI_SPIDEV=y
    91. 

  91. --- a/arch/arm/configs/bcmrpi_defconfig
    92. 

  92. +++ b/arch/arm/configs/bcmrpi_defconfig
    93. 

  93. @@ -588,6 +588,7 @@ CONFIG_RAW_DRIVER=y
    94. 

  94.  CONFIG_I2C=y
    95. 

  95.  CONFIG_I2C_CHARDEV=m
    96. 

  96.  CONFIG_I2C_BCM2708=m
    97. 

  97. +CONFIG_I2C_GPIO=m
    98. 

  98.  CONFIG_SPI=y
    99. 

  99.  CONFIG_SPI_BCM2835=m
    100. 

  100.  CONFIG_SPI_SPIDEV=y
    101.