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

[Simon Glass]

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?

Regards,
Simon