linux-kernel - Re: [PATCH v2 1/2] serdev: Split and export serdev_acpi_get_uart

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Message-ID: <e34fdf56-4fdb-b422-17d6-0b35779e37b7@kernel.org>
Date:   Thu, 5 Aug 2021 09:33:09 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org
Cc:     Mark Gross <mgross@...ux.intel.com>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v2 1/2] serdev: Split and export
 serdev_acpi_get_uart_resource()

On 04. 08. 21, 16:29, 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@...ux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> ---
> v2: added Rb tag (Hans)
>   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..436e3d1ba92c 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.
> + *
> + * Returns true if resource type is of UARTSerialBus, otherwise false.

Better to write:
  * Return: True if resource type is of UARTSerialBus, otherwise false.
which is recognized by sphinx.

> + */
> +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;

Why don't you return NULL, or sb, thus eliminating the parameter?

> +}
> +EXPORT_SYMBOL_GPL(serdev_acpi_get_uart_resource);

thanks,
-- 
js
suse labs