From cd0fa5bff8052b19bde6967c2734f323c9848568 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Sun, 13 Mar 2016 18:16:54 -0700 Subject: [PATCH] serial: pl01x: Add support for devices with the rate pre-configured. 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 Reviewed-by: Tom Rini Tested-by: Stephen Warren --- board/raspberrypi/rpi/rpi.c | 2 +- drivers/serial/serial_pl01x.c | 10 ++++++++-- include/dm/platform_data/serial_pl01x.h | 3 +++ 3 files changed, 12 insertions(+), 3 deletions(-) diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c index 1d3a4e09cf..da4b6ff234 100644 --- a/board/raspberrypi/rpi/rpi.c +++ b/board/raspberrypi/rpi/rpi.c @@ -37,7 +37,7 @@ static const struct pl01x_serial_platdata serial_platdata = { .base = 0x20201000, #endif .type = TYPE_PL011, - .clock = 3000000, + .skip_init = true, }; U_BOOT_DEVICE(bcm2835_serials) = { diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c index 552c945264..6f83835fa8 100644 --- a/drivers/serial/serial_pl01x.c +++ b/drivers/serial/serial_pl01x.c @@ -284,7 +284,10 @@ static int pl01x_serial_setbrg(struct udevice *dev, int baudrate) struct pl01x_serial_platdata *plat = dev_get_platdata(dev); struct pl01x_priv *priv = dev_get_priv(dev); - pl01x_generic_setbrg(priv->regs, priv->type, plat->clock, baudrate); + if (!plat->skip_init) { + pl01x_generic_setbrg(priv->regs, priv->type, plat->clock, + baudrate); + } return 0; } @@ -296,7 +299,10 @@ static int pl01x_serial_probe(struct udevice *dev) priv->regs = (struct pl01x_regs *)plat->base; priv->type = plat->type; - return pl01x_generic_serial_init(priv->regs, priv->type); + if (!plat->skip_init) + return pl01x_generic_serial_init(priv->regs, priv->type); + else + return 0; } static int pl01x_serial_getc(struct udevice *dev) diff --git a/include/dm/platform_data/serial_pl01x.h b/include/dm/platform_data/serial_pl01x.h index 5e068f390b..ccfa808e23 100644 --- a/include/dm/platform_data/serial_pl01x.h +++ b/include/dm/platform_data/serial_pl01x.h @@ -17,11 +17,14 @@ enum pl01x_type { * @base: Register base address * @type: Port type * @clock: Input clock rate, used for calculating the baud rate divisor + * @skip_init: Don't attempt to change port configuration (also means @clock + * is ignored) */ struct pl01x_serial_platdata { unsigned long base; enum pl01x_type type; unsigned int clock; + bool skip_init; }; #endif -- 2.39.5