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apm821xx: set uart compatible to ns16750 

The APM821XX/PPC460EX datasheet mentions:
"Register compatibility with 16750 register set"

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
openwrt-19.07
Christian Lamparter 2018-10-15 20:00:06 +02:00 committed by Hauke Mehrtens
parent 92bcd08989
commit 68bb91018d
1 changed files with 11 additions and 6 deletions
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17
target/linux/apm821xx/dts/apm82181.dtsi
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@ -306,24 +306,29 @@
};
UART0: serial@ef600300 {
device_type = "serial";
compatible = "ns16550";
/*
* AMCC's BSP u-boot scans for the "ns16550"
* compatible, without it, u-boot wouldn't
* set the "clock-frequency" which is required.
*
* However, the hardware documentation lists:
* "Register compatibility with 16750 register set"
*/
compatible = "ns16750", "ns16550";
reg = <0xef600300 0x00000008>;
virtual-reg = <0xef600300>;
clock-frequency = <0>; /* Filled in by U-Boot */
current-speed = <0>; /* Filled in by U-Boot */
interrupt-parent = <&UIC1>;
interrupts = <0x01 IRQ_TYPE_LEVEL_HIGH>;
status = "disabled";
};
UART1: serial@ef600400 {
device_type = "serial";
compatible = "ns16550";
/* same "ns16750" as with UART0 */
compatible = "ns16750", "ns16550";
reg = <0xef600400 0x00000008>;
virtual-reg = <0xef600400>;
clock-frequency = <0>; /* Filled in by U-Boot */
current-speed = <0>; /* Filled in by U-Boot */
interrupt-parent = <&UIC0>;
interrupts = <0x01 IRQ_TYPE_LEVEL_HIGH>;
status = "disabled";