diff options
| author | Thales Silva <thales.tas@gmail.com> | 2021-03-29 23:57:46 -0400 |
|---|---|---|
| committer | Robert Nelson <robertcnelson@gmail.com> | 2021-03-30 14:12:06 -0500 |
| commit | 5070523058ceb7f2ea358c7a6f58f0fbdd08d14f (patch) | |
| tree | e8ab37e71e9a16508b345e8008d33b5e3826d68b | |
| parent | 28cb22447cefc9824e2c8288e59b36d46e4f5422 (diff) | |
Added overlay of SSD1306 on I2C1
| -rw-r--r-- | src/arm/BB-I2C1-SSD1306.dts | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/arm/BB-I2C1-SSD1306.dts b/src/arm/BB-I2C1-SSD1306.dts new file mode 100644 index 0000000..7386aeb --- /dev/null +++ b/src/arm/BB-I2C1-SSD1306.dts @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2021 Thales Silva <thales.tas@gmail.com> + * + * SSD1306 cape using + * I2C1 on connector pin P9.17 P9.19 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/dts-v1/; +/plugin/; + +#include <dt-bindings/board/am335x-bbw-bbb-base.h> +#include <dt-bindings/pinctrl/am33xx.h> + +/ { + compatible = "ti,beaglebone", "ti,beaglebone-black", "ti,beaglebone-green"; + + // identification + part-number = "BB-I2C1-SSD1306"; + version = "00A0"; + + // resources this cape uses + exclusive-use = + "P9.18", // i2c1_sda + "P9.17", // i2c1_scl + + "i2c1"; // hardware ip used + + /* + * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/ + */ + fragment@0 { + target-path="/"; + __overlay__ { + + chosen { + overlays { + BB-I2C1-SSD1306 = __TIMESTAMP__; + }; + }; + }; + }; + + /* + * Free up the pins used by the cape from the pinmux helpers. + */ + fragment@1 { + target = <&ocp>; + __overlay__ { + P9_17_pinmux { status = "disabled"; }; /* i2c1_scl */ + P9_18_pinmux { status = "disabled"; }; /* i2c1_sda */ + }; + }; + + fragment@2 { + target = <&am33xx_pinmux>; + __overlay__ { + bb_i2c1_pins: pinmux_bb_i2c1_pins { + pinctrl-single,pins = < + BONE_P9_18 0x72 /* spi0_d1.i2c1_sda, SLEWCTRL_SLOW | INPUT_PULLUP | MODE2 */ + BONE_P9_17 0x72 /* spi0_cs0.i2c1_scl, SLEWCTRL_SLOW | INPUT_PULLUP | MODE2 */ + >; + }; + }; + }; + + fragment@3 { + target = <&i2c1>; + __overlay__ { + status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&bb_i2c1_pins>; + + /* this is the configuration part */ + clock-frequency = <400000>; + + #address-cells = <1>; + #size-cells = <0>; + + ssd1306: oled@3c { + compatible = "solomon,ssd1306fb-i2c"; + reg = <0x3c>; + solomon,width = <128>; + solomon,height = <64>; + solomon,com-invdir; + solomon,page-offset = <0>; + }; + }; + }; +}; |