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[v2,0/2] i2c: mux: pca954x: Support multiple devices on a single reset line

Message ID 20210727160315.15575-1-eajames@linux.ibm.com
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Series i2c: mux: pca954x: Support multiple devices on a single reset line | expand

Message

Eddie James July 27, 2021, 4:03 p.m. UTC 
Some systems connect several PCA954x devices to a single reset GPIO. For
these devices to get out of reset and probe successfully, each device must
defer the probe until the GPIO has been hogged. Accomplish this by
attempting to grab a new "reset-shared-hogged" devicetree property, but
expect it to fail with EPROBE_DEFER or EBUSY.

Changes since v1:
 - Rework the patch to use a new devicetree property that we don't expect to
   successfully obtain

Eddie James (2):
  dt-bindings: i2c: i2c-mux-pca954x: Define the reset-shared-hogged gpio
  i2c: mux: pca954x: Support multiple devices on a single reset line

 .../bindings/i2c/i2c-mux-pca954x.yaml         |  5 ++
 drivers/i2c/muxes/i2c-mux-pca954x.c           | 46 +++++++++++++++----
 2 files changed, 42 insertions(+), 9 deletions(-)