Hi,
On 8/6/21 1:17 PM, Andy Shevchenko wrote:
> The same as for I²C Serial Bus resource split and export
> serdev_acpi_get_uart_resource(). We have already a few users
> one of which is converted here.
>
> Rationale of this is to consolidate parsing UART Serial Bus
> resource in one place as it's done, e.g., for I²C Serial Bus.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
As mentioned before I believe it is best if this series is
merged in its entirety through to the tty tree, here is my
ack for patch 2/2 for that:
Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Greg, can you pickup the entire series please?
Regards,
Hans
> ---
> v3: amended kernel doc to have RETURN section (Jiri)
> drivers/tty/serdev/core.c | 36 +++++++++++++++++++++++++++++-------
> include/linux/serdev.h | 14 ++++++++++++++
> 2 files changed, 43 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index 92498961fd92..f1324fe99378 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -562,23 +562,45 @@ struct acpi_serdev_lookup {
> int index;
> };
>
> +/**
> + * serdev_acpi_get_uart_resource - Gets UARTSerialBus resource if type matches
> + * @ares: ACPI resource
> + * @uart: Pointer to UARTSerialBus resource will be returned here
> + *
> + * Checks if the given ACPI resource is of type UARTSerialBus.
> + * In this case, returns a pointer to it to the caller.
> + *
> + * Return: True if resource type is of UARTSerialBus, otherwise false.
> + */
> +bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
> + struct acpi_resource_uart_serialbus **uart)
> +{
> + struct acpi_resource_uart_serialbus *sb;
> +
> + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
> + return false;
> +
> + sb = &ares->data.uart_serial_bus;
> + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_UART)
> + return false;
> +
> + *uart = sb;
> + return true;
> +}
> +EXPORT_SYMBOL_GPL(serdev_acpi_get_uart_resource);
> +
> static int acpi_serdev_parse_resource(struct acpi_resource *ares, void *data)
> {
> struct acpi_serdev_lookup *lookup = data;
> struct acpi_resource_uart_serialbus *sb;
> acpi_status status;
>
> - if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
> - return 1;
> -
> - if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
> + if (!serdev_acpi_get_uart_resource(ares, &sb))
> return 1;
>
> if (lookup->index != -1 && lookup->n++ != lookup->index)
> return 1;
>
> - sb = &ares->data.uart_serial_bus;
> -
> status = acpi_get_handle(lookup->device_handle,
> sb->resource_source.string_ptr,
> &lookup->controller_handle);
> @@ -586,7 +608,7 @@ static int acpi_serdev_parse_resource(struct acpi_resource *ares, void *data)
> return 1;
>
> /*
> - * NOTE: Ideally, we would also want to retreive other properties here,
> + * NOTE: Ideally, we would also want to retrieve other properties here,
> * once setting them before opening the device is supported by serdev.
> */
>
> diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> index 9f14f9c12ec4..3368c261ab62 100644
> --- a/include/linux/serdev.h
> +++ b/include/linux/serdev.h
> @@ -327,4 +327,18 @@ static inline int serdev_tty_port_unregister(struct tty_port *port)
> }
> #endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */
>
> +struct acpi_resource;
> +struct acpi_resource_uart_serialbus;
> +
> +#ifdef CONFIG_ACPI
> +bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
> + struct acpi_resource_uart_serialbus **uart);
> +#else
> +static inline bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
> + struct acpi_resource_uart_serialbus **uart)
> +{
> + return false;
> +}
> +#endif /* CONFIG_ACPI */
> +
> #endif /*_LINUX_SERDEV_H */
>
