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    Subject[PATCH i2c-next v6 2/5] i2c: Add support reading of 'timeout-ms' and '#retries' properties
    Date
    This commit adds support for 'timeout-ms' and '#retries' 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 <jae.hyun.yoo@linux.intel.com>
    ---
    drivers/i2c/i2c-core-base.c | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
    index 9ee9a15e7134..433867e9af2f 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 = 0;

    /* Can't register until after driver model init */
    if (WARN_ON(!is_registered)) {
    @@ -1239,8 +1240,13 @@ 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) {
    + device_property_read_u32(&adap->dev, "timeout-ms", &timeout_ms);
    + adap->timeout = timeout_ms ? msecs_to_jiffies(timeout_ms) : HZ;
    + }
    +
    + /* Set retries value if it has the property setting */
    + device_property_read_u32(&adap->dev, "#retries", &adap->retries);

    /* register soft irqs for Host Notify */
    res = i2c_setup_host_notify_irq_domain(adap);
    --
    2.19.0
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