This commit adds support for 'timeout-ms' and '#retries' OF properties to set 'timeout' and 'retries' values in 'struct i2c_adapter' in case an adapter node has the properties. Still the values can be set by I2C_TIMEOUT and I2C_RETRIES ioctls on cdev at runtime too.
These properties may not be supported by all drivers. However, if a driver wants to support one of them, it should adapt the bindings in the dt-bindings document. Signed-off-by: Jae Hyun Yoo <[email protected]> --- drivers/i2c/i2c-core-base.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 9ee9a15e7134..b58aa17b287b 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1214,6 +1214,7 @@ EXPORT_SYMBOL_GPL(i2c_handle_smbus_host_notify); static int i2c_register_adapter(struct i2c_adapter *adap) { int res = -EINVAL; + u32 timeout_ms; /* Can't register until after driver model init */ if (WARN_ON(!is_registered)) { @@ -1239,8 +1240,21 @@ static int i2c_register_adapter(struct i2c_adapter *adap) INIT_LIST_HEAD(&adap->userspace_clients); /* Set default timeout to 1 second if not already set */ - if (adap->timeout == 0) - adap->timeout = HZ; + if (adap->timeout == 0) { + if (adap->dev.of_node) + res = of_property_read_u32(adap->dev.of_node, + "timeout-ms", + &timeout_ms); + if (res) + timeout_ms = 0; + + adap->timeout = timeout_ms ? msecs_to_jiffies(timeout_ms) : HZ; + } + + /* Set retries value if it has the OF property */ + if (adap->dev.of_node) + of_property_read_u32(adap->dev.of_node, "#retries", + &adap->retries); /* register soft irqs for Host Notify */ res = i2c_setup_host_notify_irq_domain(adap); -- 2.19.0
