On Thu, 2016-06-30 at 22:26 +0800, Kefeng Wang wrote:
>
> On 2016/6/30 17:54, Andy Shevchenko wrote:
> > On Thu, 2016-06-30 at 12:38 +0300, Andy Shevchenko wrote:
> > > On Thu, 2016-06-30 at 09:27 +0800, Kefeng Wang wrote:
> > > > Add ACPI identifier for UART on Hisilicon Hip05 soc, be careful
> > > > that it is not 16550 compatibal.
> > > >
> > > > Meanwhile, set dw8250_serial_out32 to keep consistent between
> > > > serial_out
> > > > and serial_in in ACPI.
> > > >
> > > > Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
> > > > ---
> > > > drivers/tty/serial/8250/8250_dw.c | 13 +++++++++++--
> > > > 1 file changed, 11 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/tty/serial/8250/8250_dw.c
> > > > b/drivers/tty/serial/8250/8250_dw.c
> > > > index 65f3da7..096431b 100644
> > > > --- a/drivers/tty/serial/8250/8250_dw.c
> > > > +++ b/drivers/tty/serial/8250/8250_dw.c
> > > > @@ -272,6 +272,12 @@ static bool dw8250_idma_filter(struct
> > > > dma_chan
> > > > *chan, void *param)
> > > > return param == chan->device->dev->parent;
> > > > }
> > > >
> > > > +/* non 16550 compatible id list*/
> > > > +static const struct acpi_device_id non_16550_id_list[] = {
> > > > + { "HISI0031", 0 },
> > > > + { },
> > > > +};
> > > > +
> > >
> > > On first glance it looks redundant, see below.
> >
> > Oh, wait, this is still valid, but the better solution is to use
> > device
> > properties for the rest except yours!
>
> Do you mean using something like
>
> static struct property_entry dw8250_properties[] = {
> PROPERTY_ENTRY_U32("reg-io-width", 4),
> PROPERTY_ENTRY_U32("reg-shift", 2),
> PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
> { },
> };
>
> then use platform_device_add_properties to add it to the device(16500
> compatible),
Correct for the existing devices.
>
> but for hisi, use another property_entry without
> PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible")?
For HISI in case of alternate configuration you have to tweak _DSD in
ACPI.
>
> Not clear about using device properties.
Built-in device properties only for non-DT, non-ACPI devices. You may
consider it as a successor of platform data.
>
> >
> > I will prepare patch later this week or at the beginning of next
> > week if
> > you are in hurry, otherwise I would postpone this a bit (anyway it
> > will
> > not make v4.8 cycle).
> >
>
> Thanks, hope that it will come out soon.
>
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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