On Tue, 25 Nov 2025 15:45:11 +0100, Manivannan Sadhasivam via B4 Relay
<devnull+manivannan.sadhasivam.oss.qualcomm.com@kernel.org> said:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
>
> If an external connector like M.2 is connected to the serdev controller
> in DT, then the serdev devices may be created dynamically by the connector
> driver. So do not return -ENODEV from of_serdev_register_devices() if the
> static nodes are not found and the graph node is used.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
> ---
> drivers/tty/serdev/core.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index 8c2a40a537d9..fba7b98026bb 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -12,6 +12,7 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_graph.h>
> #include <linux/of_device.h>
> #include <linux/pm_domain.h>
> #include <linux/pm_runtime.h>
> @@ -581,7 +582,13 @@ static int of_serdev_register_devices(struct serdev_controller *ctrl)
> } else
> found = true;
> }
> - if (!found)
> +
> + /*
> + * When the serdev controller is connected to an external connector like
> + * M.2 in DT, then the serdev devices may be created dynamically by the
> + * connector driver.
> + */
> + if (!found && !of_graph_is_present(ctrl->dev.of_node))
> return -ENODEV;
>
> return 0;
>
> --
> 2.48.1
>
>
>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>