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serial: ns16550: Add reset ctrl to driver

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Add code to reset all reset signals as in serial DT node. A reset
property is an optional feature, so do not fail if a reset property is
not present.

If a reset property is discovered, then use it to deassert, thus
bringing the IP out of reset.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ley Foon Tan 2018-06-14 18:45:22 +08:00 committed by Tom Rini
parent 2d4d693772
commit b051eecbda
1 changed files with 8 additions and 0 deletions
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8
drivers/serial/ns16550.c
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@ -9,6 +9,7 @@
#include <dm.h>
#include <errno.h>
#include <ns16550.h>
#include <reset.h>
#include <serial.h>
#include <watchdog.h>
#include <linux/types.h>
@ -177,6 +178,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
#if defined(CONFIG_ARCH_OMAP2PLUS)
serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
#endif
serial_out(UART_MCRVAL, &com_port->mcr);
serial_out(ns16550_getfcr(com_port), &com_port->fcr);
if (baud_divisor != -1)
@ -370,6 +372,12 @@ static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
int ns16550_serial_probe(struct udevice *dev)
{
struct NS16550 *const com_port = dev_get_priv(dev);
struct reset_ctl_bulk reset_bulk;
int ret;
ret = reset_get_bulk(dev, &reset_bulk);
if (!ret)
reset_deassert_bulk(&reset_bulk);
com_port->plat = dev_get_platdata(dev);
NS16550_init(com_port, -1);