linux-kernel - Re: [PATCH] serial: imx: remove unused imx_uart_is

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Date:   Sat, 18 Mar 2023 07:51:28 -0700
From:   Tom Rix <trix@...hat.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, nathan@...nel.org,
        ndesaulniers@...gle.com, llvm@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: imx: remove unused imx_uart_is_imx* functions


On 3/18/23 7:30 AM, Uwe Kleine-König wrote:
> On Fri, Mar 17, 2023 at 04:57:10PM -0400, Tom Rix wrote:
>> clang with W=1 reports
>> drivers/tty/serial/imx.c:292:19: error:
>>    unused function 'imx_uart_is_imx21' [-Werror,-Wunused-function]
>> static inline int imx_uart_is_imx21(struct imx_port *sport)
>>                    ^
>> drivers/tty/serial/imx.c:297:19: error:
>>    unused function 'imx_uart_is_imx53' [-Werror,-Wunused-function]
>> static inline int imx_uart_is_imx53(struct imx_port *sport)
>>                    ^
>> drivers/tty/serial/imx.c:302:19: error:
>>    unused function 'imx_uart_is_imx6q' [-Werror,-Wunused-function]
>> static inline int imx_uart_is_imx6q(struct imx_port *sport)
>>                    ^
>> These static functions are not used, so remove them.
>>
>> Signed-off-by: Tom Rix <trix@...hat.com>
> Funny, is_imx6q_uart() was introduced in
> a496e6284c482555db8078190bb689594d129fa9 and never used. Since that
> commit is_imx21_uart() also unused. And the imx53 variant was also never
> used.
>
> Looking at that a bit more, the following cleanup is also possible (only
> compile tested):
>
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 8308a23c55a7..a38ee0ed2210 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -178,8 +178,6 @@
>   enum imx_uart_type {
>   	IMX1_UART,
>   	IMX21_UART,
> -	IMX53_UART,
> -	IMX6Q_UART,
>   };
>   
>   /* device type dependent stuff */
> @@ -241,30 +239,21 @@ struct imx_port_ucrs {
>   	unsigned int	ucr3;
>   };
>   
> -static struct imx_uart_data imx_uart_devdata[] = {
> -	[IMX1_UART] = {
> -		.uts_reg = IMX1_UTS,
> -		.devtype = IMX1_UART,
> -	},
> -	[IMX21_UART] = {
> -		.uts_reg = IMX21_UTS,
> -		.devtype = IMX21_UART,
> -	},
> -	[IMX53_UART] = {
> -		.uts_reg = IMX21_UTS,
> -		.devtype = IMX53_UART,
> -	},
> -	[IMX6Q_UART] = {
> -		.uts_reg = IMX21_UTS,
> -		.devtype = IMX6Q_UART,
> -	},
> +static const struct imx_uart_data imx_uart_imx1_devdata = {
> +	.uts_reg = IMX1_UTS,
> +	.devtype = IMX1_UART,
> +};
> +
> +static const struct imx_uart_data imx_uart_imx21_devdata = {
> +	.uts_reg = IMX21_UTS,
> +	.devtype = IMX21_UART,
>   };
>   
>   static const struct of_device_id imx_uart_dt_ids[] = {
> -	{ .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], },
> -	{ .compatible = "fsl,imx53-uart", .data = &imx_uart_devdata[IMX53_UART], },
> -	{ .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], },
> -	{ .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], },
> +	{ .compatible = "fsl,imx6q-uart", .data = &imx_uart_imx21_devdata, },
> +	{ .compatible = "fsl,imx53-uart", .data = &imx_uart_imx21_devdata, },
> +	{ .compatible = "fsl,imx1-uart", .data = &imx_uart_imx1_devdata, },
> +	{ .compatible = "fsl,imx21-uart", .data = &imx_uart_imx21_devdata, },
>   	{ /* sentinel */ }
>   };
>   MODULE_DEVICE_TABLE(of, imx_uart_dt_ids);
>
> If you feel like squashing that into your commit or put it into a
> separate commit with a nice commit log (after convincing yourself that
> the change is fine), feel free to do so.
>
> If you don't:

My interest is not in imx specifically, but rather cleaning up all the 
unused functions.

I _think_ I can get the list of around 70 down to around 10 but it will 
take a while.

Tom


>
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
>
> Best regards
> Uwe
>