On 21 December 2015 at 18:11, Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
> On Mon, Dec 21, 2015 at 4:49 PM, Aleksey Makarov
> <aleksey.makarov@xxxxxxxxxx> wrote:
>> From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
>>
>> In ACPI this device is only defined in SBSA mode so
>> if we are coming from ACPI use this mode.
>>
>> Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@xxxxxxxxxx>
>> ---
>> drivers/tty/serial/amba-pl011.c | 37 ++++++++++++++++++++++++++-----------
>> 1 file changed, 26 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
>> index 899a771..766ce4f 100644
>> --- a/drivers/tty/serial/amba-pl011.c
>> +++ b/drivers/tty/serial/amba-pl011.c
>> @@ -2368,18 +2368,33 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
>> if (!uap)
>> return -ENOMEM;
>>
>> - uap->clk = devm_clk_get(&dev->dev, NULL);
>> - if (IS_ERR(uap->clk))
>> - return PTR_ERR(uap->clk);
>> -
>> - uap->vendor = vendor;
>> - uap->lcrh_rx = vendor->lcrh_rx;
>> - uap->lcrh_tx = vendor->lcrh_tx;
>> - uap->fifosize = vendor->get_fifosize(dev);
>> - uap->port.irq = dev->irq[0];
>> - uap->port.ops = &amba_pl011_pops;
>> + /* ACPI only defines SBSA variant */
>> + if (ACPI_COMPANION(&dev->dev)) {
>
> has_acpi_companion()
>
>> + /*
>> + * According to ARM ARMH0011 is currently the only mapping
>> + * of pl011 in ACPI and it's mapped to SBSA UART mode
>> + */
>> + uap->vendor = &vendor_sbsa;
>> + uap->fifosize = 32;
>> + uap->port.ops = &sbsa_uart_pops;
>> + uap->fixed_baud = 115200;
>
> Shouldn't you match by ID and provide the custom values if any?
> On the other hand have you checked if it's possible to use _DSD in this case?
>
So far I have not seen any use of SBSA UART other than this in real
life. I am a little opposed to providing complexity people are not
going to use.
Graeme
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