linux/Documentation/devicetree/bindings/display/ssd1307fb.txt
Tomi Valkeinen ba14301e03 fbdev/ssd1307fb: add support to enable VBAT
SSD1306 needs VBAT when it is wired in charge pump configuration. This
patch adds support to the driver to enable VBAT regulator at init time.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Benoît Cousson <bcousson@baylibre.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
2017-02-08 16:43:59 +01:00

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* Solomon SSD1307 Framebuffer Driver
Required properties:
- compatible: Should be "solomon,<chip>fb-<bus>". The only supported bus for
now is i2c, and the supported chips are ssd1305, ssd1306, ssd1307 and
ssd1309.
- reg: Should contain address of the controller on the I2C bus. Most likely
0x3c or 0x3d
- pwm: Should contain the pwm to use according to the OF device tree PWM
specification [0]. Only required for the ssd1307.
- solomon,height: Height in pixel of the screen driven by the controller
- solomon,width: Width in pixel of the screen driven by the controller
- solomon,page-offset: Offset of pages (band of 8 pixels) that the screen is
mapped to.
Optional properties:
- reset-gpios: The GPIO used to reset the OLED display, if available. See
Documentation/devicetree/bindings/gpio/gpio.txt for details.
- vbat-supply: The supply for VBAT
- solomon,segment-no-remap: Display needs normal (non-inverted) data column
to segment mapping
- solomon,com-seq: Display uses sequential COM pin configuration
- solomon,com-lrremap: Display uses left-right COM pin remap
- solomon,com-invdir: Display uses inverted COM pin scan direction
- solomon,com-offset: Number of the COM pin wired to the first display line
- solomon,prechargep1: Length of deselect period (phase 1) in clock cycles.
- solomon,prechargep2: Length of precharge period (phase 2) in clock cycles.
This needs to be the higher, the higher the capacitance
of the OLED's pixels is
[0]: Documentation/devicetree/bindings/pwm/pwm.txt
Examples:
ssd1307: oled@3c {
compatible = "solomon,ssd1307fb-i2c";
reg = <0x3c>;
pwms = <&pwm 4 3000>;
reset-gpios = <&gpio2 7>;
reset-active-low;
};
ssd1306: oled@3c {
compatible = "solomon,ssd1306fb-i2c";
reg = <0x3c>;
pwms = <&pwm 4 3000>;
reset-gpios = <&gpio2 7>;
reset-active-low;
solomon,com-lrremap;
solomon,com-invdir;
solomon,com-offset = <32>;
};