[PATCH v3 0/3] i2c: gpio: support write-only sda

Heiner Kallweit
2023-01-15T10:11:43Z

There are slave devices that understand I2C but have read-only
SDA and SCL. Examples are FD650 7-segment LED controller and
its derivatives. Typical board designs don't even have a
pull-up for both pins. This patch makes i2c-gpio usable with
such devices, based on new DT property i2c-gpio,sda-output-only.

v2:
- improve commit message for patch 1

v3:
- patch 2: check for adap->getsda in readbytes()
- patch 2: align warning message level for info on missing getscl/getsda
- patch 3: improve description of attribute sda_is_output_only

Heiner Kallweit (3):
dt-bindings: i2c-gpio: Add property i2c-gpio,sda-output-only
i2c: algo: bit: allow getsda to be NULL
i2c: gpio: support write-only sda

.../devicetree/bindings/i2c/i2c-gpio.yaml | 4 ++++
drivers/i2c/algos/i2c-algo-bit.c | 16 ++++++++++++++--
drivers/i2c/busses/i2c-gpio.c | 14 +++++++++++---
include/linux/platform_data/i2c-gpio.h | 3 +++
4 files changed, 32 insertions(+), 5 deletions(-)

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2.39.0