Add PIO-assisted WS2812 LEDs driver #6551
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Change the Kconfig dependencies so that RP1_PIO depends on FIRMWARE_RP1, rather than selecting it. Signed-off-by: Phil Elwell <[email protected]>
Having changed a Kconfig "select" to a "depends on", RP1_PIO must be explicitly enabled. Signed-off-by: Phil Elwell <[email protected]>
Sort the probe function initialisation into a more logical order. Signed-off-by: Phil Elwell <[email protected]>
Floating point arithmetic is not supported in the kernel, so use fixed point instead. Signed-off-by: Phil Elwell <[email protected]>
No functional change. Signed-off-by: Phil Elwell <[email protected]>
Add kernel-facing implementations of pio_sm_config_xfer and pio_xm_xfer_data. Signed-off-by: Phil Elwell <[email protected]>
ws2812-pio-rp1 is a PIO-based driver for WS2812 LEDS. It creates a character device in /dev, the default name of which is /dev/leds<n>, where <n> is the instance number. The number of LEDS should be set in the DT overlay, as should whether it is RGB or RGBW, and the default brightness. Write data to the /dev/* entry in a 4 bytes-per-pixel format in RGBW order: RR GG BB WW RR GG BB WW ... The white values are ignored unless the rgbw flag is set for the device. To change the brightness, write a single byte to offset 0, 255 being full brightness and 0 being off. Signed-off-by: Phil Elwell <[email protected]>
Add an overlay to enable a WS2812 LED driver on a given GPIO. Signed-off-by: Phil Elwell <[email protected]>
Enable the WS2812_PIO_RP1 driver in both the defconfig files that support the Pi 5 family. Signed-off-by: Phil Elwell <[email protected]>
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kernel: dtoverlays: Add override for target-path on I2C overlays See: raspberrypi/linux#6541 kernel: misc: rp1-pio: Support larger data transfers See: raspberrypi/linux#6543 kernel: dtoverlays: Use continuous clock mode for ov9281 See: raspberrypi/linux#6542 kernel: overlays: goodix: Allow override i2c address See: raspberrypi/linux#6547 kernel: Add PIO-assisted WS2812 LEDs driver See: raspberrypi/linux#6551 kernel: overlays: Add and document i2c_csi_dsi0 parameters See: raspberrypi/linux#6553
popcornmix
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kernel: dtoverlays: Add override for target-path on I2C overlays See: raspberrypi/linux#6541 kernel: misc: rp1-pio: Support larger data transfers See: raspberrypi/linux#6543 kernel: dtoverlays: Use continuous clock mode for ov9281 See: raspberrypi/linux#6542 kernel: overlays: goodix: Allow override i2c address See: raspberrypi/linux#6547 kernel: Add PIO-assisted WS2812 LEDs driver See: raspberrypi/linux#6551 kernel: overlays: Add and document i2c_csi_dsi0 parameters See: raspberrypi/linux#6553
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Extend the in-kernel PIO support to include data transfers via DMA. Use that to implement a WS2812 LEDs driver.