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

Message ID 3a5545f3-f858-2c80-8bd4-2e0d401a1dc0@gmail.com
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Series i2c: gpio: support write-only sda | expand

Message

Heiner Kallweit Jan. 15, 2023, 10:10 a.m. UTC 
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(-)