linux-kernel - [PATCH v2 0/2] i2c: mux: pca954x: Support multiple devices on a single reset line

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Message-Id: <20210727160315.15575-1-eajames@linux.ibm.com>
Date:   Tue, 27 Jul 2021 11:03:13 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-i2c@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        peda@...ntia.se, robh+dt@...nel.org,
        Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH v2 0/2] i2c: mux: pca954x: Support multiple devices on a single reset line

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(-)

-- 
2.27.0