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serial: bcm283x_mu: add device tree support

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This patch adds device tree support for the bcm283x mini-uart driver.

Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Fabian Vogt 2016-09-26 14:26:44 +02:00 committed by Tom Rini
parent 4faf5f93c6
commit 9f755f5d09
2 changed files with 38 additions and 0 deletions
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10
doc/device-tree-bindings/serial/bcm2835-aux-uart.txt Normal file
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@ -0,0 +1,10 @@
* BCM283x mini UART
Required properties:
- compatible: must be "brcm,bcm2835-aux-uart"
- reg: exactly one register range with length 0x1000
- clock: input clock frequency for the UART (used to calculate the baud
rate divisor)
Optional properties:
- skip-init: if present, the baud rate divisor is not changed

28
drivers/serial/serial_bcm283x_mu.c
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@ -25,6 +25,8 @@
#include <linux/compiler.h>
#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
struct bcm283x_mu_regs {
u32 io;
u32 iir;
@ -132,9 +134,35 @@ static const struct dm_serial_ops bcm283x_mu_serial_ops = {
.setbrg = bcm283x_mu_serial_setbrg,
};
#if CONFIG_IS_ENABLED(OF_CONTROL)
static const struct udevice_id bcm283x_mu_serial_id[] = {
{.compatible = "brcm,bcm2835-aux-uart"},
{}
};
static int bcm283x_mu_serial_ofdata_to_platdata(struct udevice *dev)
{
struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
fdt_addr_t addr;
addr = dev_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
plat->base = addr;
plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "clock", 1);
plat->skip_init = fdtdec_get_bool(gd->fdt_blob, dev->of_offset,
"skip-init");
plat->disabled = false;
return 0;
}
#endif
U_BOOT_DRIVER(serial_bcm283x_mu) = {
.name = "serial_bcm283x_mu",
.id = UCLASS_SERIAL,
.of_match = of_match_ptr(bcm283x_mu_serial_id),
.ofdata_to_platdata = of_match_ptr(bcm283x_mu_serial_ofdata_to_platdata),
.platdata_auto_alloc_size = sizeof(struct bcm283x_mu_serial_platdata),
.probe = bcm283x_mu_serial_probe,
.ops = &bcm283x_mu_serial_ops,