[U-Boot] [PATCH] serial: pl01x: Add support for devices with the rate pre-configured.

[Tom Rini]

On Mon, Feb 08, 2016 at 11:26:04AM -0800, Sergei Temerkhanov wrote:
> On Sat, Feb 6, 2016 at 12:44 PM, Simon Glass <sjg at chromium.org> wrote:
> > Hi Eric,
> >
> > On 5 February 2016 at 14:43, Eric Anholt <eric at anholt.net> wrote:
> >> For Raspberry Pi, we had the input clock rate to the pl011 fixed in
> >> the rpi.c file, but it may be changed by firmware due to user changes
> >> to config.txt.  Since the firmware always sets up the uart (default
> >> 115200 output unless the user changes it), we can just skip our own
> >> uart init to simplify the boot process and more reliably get serial
> >> output.
> >>
> >> Signed-off-by: Eric Anholt <eric at anholt.net>
> >> ---
> >>  board/raspberrypi/rpi/rpi.c             | 3 +--
> >>  drivers/serial/serial_pl01x.c           | 4 ++++
> >>  include/dm/platform_data/serial_pl01x.h | 1 +
> >>  3 files changed, 6 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
> >> index 4b80d7b..1fd3f97 100644
> >> --- a/board/raspberrypi/rpi/rpi.c
> >> +++ b/board/raspberrypi/rpi/rpi.c
> >> @@ -35,8 +35,7 @@ static const struct pl01x_serial_platdata serial_platdata = {
> >>  #else
> >>         .base = 0x20201000,
> >>  #endif
> >> -       .type = TYPE_PL011,
> >> -       .clock = 3000000,
> >> +       .type = TYPE_PL01X_PRECONFIGURED,
> >>  };
> >>
> >>  U_BOOT_DEVICE(bcm2835_serials) = {
> >> diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
> >> index 552c945..7d4d214 100644
> >> --- a/drivers/serial/serial_pl01x.c
> >> +++ b/drivers/serial/serial_pl01x.c
> >> @@ -83,6 +83,8 @@ static int pl01x_generic_serial_init(struct pl01x_regs *regs,
> >>                 /* disable everything */
> >>                 writel(0, &regs->pl011_cr);
> >>                 break;
> >> +       case TYPE_PL01X_PRECONFIGURED:
> >> +               break;
> >>         default:
> >>                 return -EINVAL;
> >>         }
> >> @@ -172,6 +174,8 @@ static int pl01x_generic_setbrg(struct pl01x_regs *regs, enum pl01x_type type,
> >>                 writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
> >>                        UART_PL011_CR_RXE | UART_PL011_CR_RTS, &regs->pl011_cr);
> >>                 break;
> >> +       case TYPE_PL01X_PRECONFIGURED:
> >> +               break;
> >>         }
> >>         default:
> >>                 return -EINVAL;
> >> diff --git a/include/dm/platform_data/serial_pl01x.h b/include/dm/platform_data/serial_pl01x.h
> >> index 5e068f3..ae1bf31 100644
> >> --- a/include/dm/platform_data/serial_pl01x.h
> >> +++ b/include/dm/platform_data/serial_pl01x.h
> >> @@ -9,6 +9,7 @@
> >>  enum pl01x_type {
> >>         TYPE_PL010,
> >>         TYPE_PL011,
> >> +       TYPE_PL01X_PRECONFIGURED,
> >
> > This seems odd. You are not adding a new UART type.
> >
> > How about a separate bool flag?
> 
> I posted a patch with the same purpose a while ago
> http://lists.denx.de/pipermail/u-boot/2015-October/230079.html

And then we got bogged down in "make a DT binding that's accepted" hell.

-- 
Tom
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