Re: [PATCH 2/2] serial: 8250_dw: Add Sophgo SG2044 quirk

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Thu, Oct 10, 2024 at 07:39:06AM +0800, Inochi Amaoto wrote:
> SG2044 relys on an internal divisor when calculating bitrate, which
> means a wrong clock for the most common bitrates. So add a quirk for
> this uart device to skip the set rate call and only relys on the
> internal UART divisor.

...

> +static const struct dw8250_platform_data dw8250_sophgo_sg2044_data = {
> +	.usr_reg = DW_UART_USR,
> +	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
> +};
> +
>  static const struct dw8250_platform_data dw8250_starfive_jh7100_data = {
>  	.usr_reg = DW_UART_USR,
>  	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,

For the bare minimum this should be deduplicated as to have one record for now.

static const struct dw8250_platform_data dw8250_skip_set_rate_data = {
	.usr_reg = DW_UART_USR,
	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
};

If we need different quirks in the future, they can be split again.
Or, if you certain that new quirks will come, mention this in
the commit message.

...

>  	{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
>  	{ .compatible = "marvell,armada-38x-uart", .data = &dw8250_armada_38x_data },
>  	{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },
> +	{ .compatible = "sophgo,sg2044-uart", .data = &dw8250_sophgo_sg2044_data },
>  	{ .compatible = "starfive,jh7100-uart", .data = &dw8250_starfive_jh7100_data },

I think my proposal for having a common compatible for those two is a no-go
as compatible strings are for the (unique) hardware and shouldn't be abstracted
based on some Linux or other OS shortcuts / quirks.

-- 
With Best Regards,
Andy Shevchenko