Re: [PATCH] serial: sifive: Remove 0 from fu540-c000-uart0 binding.

[Samuel Holland <samuel.holland@sifive.com>]

Hi Conor, Sebastian,

On 2024-03-07 11:39 AM, Conor Dooley wrote:
> On Thu, Mar 07, 2024 at 10:09:50AM +0100, Sebastian Andrzej Siewior wrote:
>> The driver is using "sifive,fu540-c000-uart0" as a binding. The device
>> tree and documentation states "sifive,fu540-c000-uart" instead. This
>> means the binding is not matched and not used.
>>
>> This did not cause any problems because the alternative binding, used in
>> the device tree, "sifive,uart0" is not handling the hardware any
>> different.
>>
>> Align the binding in the driver with the documentation.
>>
>> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>> ---
>> On 2024-03-06 18:48:13 [-0800], Paul Walmsley wrote:
>>> On Mon, 4 Mar 2024, Conor Dooley wrote:
>>>> I suspect that the driver is what's incorrect, given there's little
>>>> value in putting the IP version in the SoC-specific compatible as it's
>>>> a fixed implementation. I'd change the driver to match the bindings.
>>>
>>> Agreed
>>
> 
>> I didn't add any stable/ fixes tags as I guess there is no point in
>> backporting this.
> 
> Every documented device falls back to "sifive,uart0", as you mention
> above, so I think that's reasonable.

Right. In fact this means the sifive,fu540-c000-uart compatible can be removed
from the driver entirely, since the driver would match sifive,uart0 anyway.

Regards,
Samuel

> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> 
> Thanks,
> Conor.
> 
>>
>>> - Paul
>>
>>  drivers/tty/serial/sifive.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
>> index 0670fd9f84967..cbfce65c9d221 100644
>> --- a/drivers/tty/serial/sifive.c
>> +++ b/drivers/tty/serial/sifive.c
>> @@ -761,7 +761,7 @@ static int __init early_sifive_serial_setup(struct earlycon_device *dev,
>>  }
>>  
>>  OF_EARLYCON_DECLARE(sifive, "sifive,uart0", early_sifive_serial_setup);
>> -OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart0",
>> +OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart",
>>  		    early_sifive_serial_setup);
>>  #endif /* CONFIG_SERIAL_EARLYCON */
>>  
>> @@ -1032,7 +1032,7 @@ static DEFINE_SIMPLE_DEV_PM_OPS(sifive_uart_pm_ops, sifive_serial_suspend,
>>  				sifive_serial_resume);
>>  
>>  static const struct of_device_id sifive_serial_of_match[] = {
>> -	{ .compatible = "sifive,fu540-c000-uart0" },
>> +	{ .compatible = "sifive,fu540-c000-uart" },
>>  	{ .compatible = "sifive,uart0" },
>>  	{},
>>  };
>> -- 
>> 2.43.0
>>
>> Sebastian


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