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0420-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch

0420-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch 2.0 KB
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  1. From 0583a0c3f173c327dff70ee9d7a0d70e50b5d120 Mon Sep 17 00:00:00 2001
    2. 

  2. From: Phil Elwell <phil@raspberrypi.org>
    3. 

  3. Date: Fri, 1 Jul 2016 22:34:52 +0100
    4. 

  4. Subject: [PATCH] BCM270X_DT: Overlay to re-enable HW CS on SPI0
    5. 

  5. 

  6. See: https://github.com/raspberrypi/linux/issues/1547
    7. 

  7. 

  8. Signed-off-by: Phil Elwell <phil@raspberrypi.org>
    9. 

  9. ---
    10. 

  10.  arch/arm/boot/dts/overlays/Makefile               |  1 +
    11. 

  11.  arch/arm/boot/dts/overlays/README                 |  6 ++++++
    12. 

  12.  arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts | 26 +++++++++++++++++++++++
    13. 

  13.  3 files changed, 33 insertions(+)
    14. 

  14.  create mode 100644 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
    15. 

  15. 

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

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

  18. @@ -81,6 +81,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
    19. 

  19.  dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
    20. 

  20.  dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
    21. 

  21.  dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
    22. 

  22. +dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
    23. 

  23.  dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
    24. 

  24.  dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
    25. 

  25.  dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
    26. 

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

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

  28. @@ -1006,6 +1006,12 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
    29. 

  29.  Params: pcf2123                 Select the PCF2123 device
    30. 

  30.  
    31. 

  31.  
    32. 

  32. +Name:   spi0-hw-cs
    33. 

  33. +Info:   Re-enables hardware CS/CE (chip selects) for SPI0
    34. 

  34. +Load:   dtoverlay=spi0-hw-cs
    35. 

  35. +Params: <None>
    36. 

  36. +
    37. 

  37. +
    38. 

  38.  Name:   spi1-1cs
    39. 

  39.  Info:   Enables spi1 with a single chip select (CS) line and associated spidev
    40. 

  40.          dev node. The gpio pin number for the CS line and spidev device node
    41. 

  41. --- /dev/null
    42. 

  42. +++ b/arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
    43. 

  43. @@ -0,0 +1,26 @@
    44. 

  44. +/*
    45. 

  45. + * Device tree overlay to re-enable hardware CS for SPI0
    46. 

  46. + */
    47. 

  47. +
    48. 

  48. +/dts-v1/;
    49. 

  49. +/plugin/;
    50. 

  50. +
    51. 

  51. +/ {
    52. 

  52. +	compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
    53. 

  53. +
    54. 

  54. +	fragment@0 {
    55. 

  55. +		target = <&spi0>;
    56. 

  56. +		__overlay__ {
    57. 

  57. +			cs-gpios = <0>, <0>;
    58. 

  58. +			status = "okay";
    59. 

  59. +		};
    60. 

  60. +	};
    61. 

  61. +
    62. 

  62. +	fragment@1 {
    63. 

  63. +		target = <&spi0_cs_pins>;
    64. 

  64. +		__overlay__ {
    65. 

  65. +			brcm,pins = <8 7>;
    66. 

  66. +			brcm,function = <4>; /* alt0 */
    67. 

  67. +		};
    68. 

  68. +	};
    69. 

  69. +};
    70.