On Tue, Dec 01, 2015 at 03:21:47AM +0100, Rafael J. Wysocki wrote:
> On Wednesday, September 30, 2015 11:38:50 AM Graeme Gregory wrote:
> > In ACPI this device is only defined in SBSA mode so
> > if we are probing from ACPI use this mode.
> >
> > Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> > Cc: Len Brown <lenb@xxxxxxxxxx>
> > Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> > ---
> > drivers/tty/serial/amba-pl011.c | 32 +++++++++++++++++++++-----------
> > 1 file changed, 21 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> > index fd27e98..55209aa 100644
> > --- a/drivers/tty/serial/amba-pl011.c
> > +++ b/drivers/tty/serial/amba-pl011.c
> > @@ -2368,18 +2368,28 @@ 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);
> > + /* ACPI only defines SBSA variant */
> > + if (!ACPI_COMPANION(&dev->dev)) {
>
> It would read more straightforward if you did
>
> if (ACPI_COMPANION(&dev->dev)) {
> <handle the ACPI case>
> } else {
> <handle the non-ACPI case>
> }
>
This was something I debated about whether to put the ACPI case or the
common case first. I can certainly reverse it.
> > + 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.ops = &amba_pl011_pops;
> > + snprintf(uap->type, sizeof(uap->type), "PL011 rev%u",
> > + amba_rev(dev));
> > + } else {
> > + uap->vendor = &vendor_sbsa;
> > + uap->fifosize = 32;
> > + uap->port.ops = &sbsa_uart_pops;
> > + uap->fixed_baud = 115200;
> > +
> > + snprintf(uap->type, sizeof(uap->type), "SBSA");
>
> This looks sort of heavy-handed.
>
> Is this the only possible configuration of the device in the ACPI case?
>
As far as I can tell yes, but ARM haven't actually published a document
to state that as fact.
This does replace the platform_probe that Russel was unhappy about for
the ACPI case.
Graeme
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
