Tested-by: Vlado Plaga <rechner@xxxxxxxxxxx>
This patch works for me - without it my screen stays black (Acer CB5-311).
On 25/09/2018 18:06, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> If an I2C adapter doesn't match the provided device tree node, also try
> matching the parent's device tree node. This allows finding an adapter
> based on the device node of the parent device that was used to register
> it.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
[...]
> drivers/i2c/i2c-core-of.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
> index 6cb7ad608bcd..37d34885ea2d 100644
> --- a/drivers/i2c/i2c-core-of.c
> +++ b/drivers/i2c/i2c-core-of.c
> @@ -121,6 +121,14 @@ static int of_dev_node_match(struct device *dev, void *data)
> return dev->of_node == data;
> }
>
> +static int of_parent_node_match(struct device *dev, void *data)
> +{
> + if (dev->parent)
> + return dev->parent->of_node == data;
> +
> + return 0;
> +}
> +
> /* must call put_device() when done with returned i2c_client device */
> struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
> {
> @@ -146,6 +154,9 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
> struct i2c_adapter *adapter;
>
> dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
> + if (!dev)
> + dev = bus_find_device(&i2c_bus_type, NULL, node, of_parent_node_match);
> +
> if (!dev)
> return NULL;
>
--
Vlado Plaga
http://vlado-do.de/
akualisiert: 2018-05-08
"Wer das Geld hat, hat die Macht und wer die Macht hat, hat das Recht"
aus 'Der Kampf geht weiter', Rio Reiser und R.P.S. Lanrue, 1971
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