serial: 16550: Add Ingenic JZ4780 support
Add compatibility string for the Ingenic JZ4780 SoC, the necessary
UART enable bit into FCR and register shift. Neither are encoded
in the DTS coming from Linux, so we need to support it this way.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 3130a1d..9b423a5 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -363,6 +363,7 @@
#if CONFIG_IS_ENABLED(OF_CONTROL)
enum {
PORT_NS16550 = 0,
+ PORT_JZ4780,
};
#endif
@@ -370,6 +371,7 @@
int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
{
struct ns16550_platdata *plat = dev->platdata;
+ const u32 port_type = dev_get_driver_data(dev);
fdt_addr_t addr;
struct clk clk;
int err;
@@ -439,6 +441,8 @@
}
plat->fcr = UART_FCRVAL;
+ if (port_type == PORT_JZ4780)
+ plat->fcr |= UART_FCR_UME;
return 0;
}
@@ -461,6 +465,7 @@
static const struct udevice_id ns16550_serial_ids[] = {
{ .compatible = "ns16550", .data = PORT_NS16550 },
{ .compatible = "ns16550a", .data = PORT_NS16550 },
+ { .compatible = "ingenic,jz4780-uart", .data = PORT_JZ4780 },
{ .compatible = "nvidia,tegra20-uart", .data = PORT_NS16550 },
{ .compatible = "snps,dw-apb-uart", .data = PORT_NS16550 },
{ .compatible = "ti,omap2-uart", .data = PORT_NS16550 },
diff --git a/include/ns16550.h b/include/ns16550.h
index 45fd68b..7c97036 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -118,6 +118,9 @@
#define UART_FCR_RXSR 0x02 /* Receiver soft reset */
#define UART_FCR_TXSR 0x04 /* Transmitter soft reset */
+/* Ingenic JZ47xx specific UART-enable bit. */
+#define UART_FCR_UME 0x10
+
/*
* These are the definitions for the Modem Control Register
*/