dtoverlays: Fixup pendown gpio polarity for ads7846 users #6029
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The driver has been converted to use gpiod, which will normalise polarity based on DT. The piscreen overlay (and others) incorrectly defines the pendown GPIO as being ACTIVE_HIGH (0), althought triggering on the high-low edge for pen down. It therefore tries reading the pen position when not being touched, and stops when it is touched. Tested with piscreen and ads7846 overlays. Also fixed on others where the interrupt says high->low but the polarity was ACTIVE_HIGH. Signed-off-by: Dave Stevenson <[email protected]>
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(Pushed to the wrong branch. Now corrected again and rebased in the process). |
popcornmix
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Mar 19, 2024
See: raspberrypi/linux#6054 kernel: overlays: i2c-rtc: pcf8563 supports wakeup-source See: raspberrypi/linux#6052 kernel: ARM: dts: bcm2712: Move /soc/sound to bcm2712-rpi See: raspberrypi/linux#6051 kernel: I2C: Improve reliability at higher bus speeds See: raspberrypi/linux#6050 kernel: dmaengine: dw-axi-dmac: Fix a non-atomic update See: raspberrypi/linux#6044 kernel: dtoverlays: Add a disconnect_on_idle override to i2c-mux See: raspberrypi/linux#6040 kernel: Add support for generic i2c-mux base-nr property See: raspberrypi/linux#6038 kernel: dtoverlays: Fixup pendown gpio polarity for ads7846 users See: raspberrypi/linux#6029
popcornmix
added a commit
to raspberrypi/rpi-firmware
that referenced
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Mar 19, 2024
See: raspberrypi/linux#6054 kernel: overlays: i2c-rtc: pcf8563 supports wakeup-source See: raspberrypi/linux#6052 kernel: ARM: dts: bcm2712: Move /soc/sound to bcm2712-rpi See: raspberrypi/linux#6051 kernel: I2C: Improve reliability at higher bus speeds See: raspberrypi/linux#6050 kernel: dmaengine: dw-axi-dmac: Fix a non-atomic update See: raspberrypi/linux#6044 kernel: dtoverlays: Add a disconnect_on_idle override to i2c-mux See: raspberrypi/linux#6040 kernel: Add support for generic i2c-mux base-nr property See: raspberrypi/linux#6038 kernel: dtoverlays: Fixup pendown gpio polarity for ads7846 users See: raspberrypi/linux#6029
This was referenced Mar 25, 2024
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The driver has been converted to use gpiod, which will normalise polarity based on DT.
The piscreen overlay (and others) incorrectly defines the pendown GPIO as being ACTIVE_HIGH (0), althought triggering on the high-low edge for pen down. It therefore tries reading the pen position when not being touched, and stops when it is touched.
Tested with piscreen and ads7846 overlays. Also fixed on others where the interrupt says high->low but the polarity was ACTIVE_HIGH.
raspberrypi/bookworm-feedback#88