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dts: add reg-shift property to all ns16550 devices

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The ns16550 flags reg-shift property as optional. In case it is not
supplied, the ns16550 driver relies on a value defined in <soc.h>, or,
by default it takes 4 (shift by 2).

This patch adds the property to all ns16550 nodes, with the following
values:

- 2 if SoC did not have any custom value defined by
  UART_REG_ADDR_INTERVAL (corresponds to 1 << 2 = 4)
- If SoC defined DEFAULT_REG_INTERVAL (snps_arc_iot/it8xxx2), use such
  value (4=2, 2=1, 1=0).

These changes will allow simplifying the ns16550 driver.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
This commit is contained in:
Gerard Marull-Paretas 2022-06-15 13:59:22 +02:00 • committed by Maureen Helm
commit 4c8a8149de
19 changed files with 45 additions and 15 deletions
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2
dts/nios2/intel/nios2-qemu.dtsi
View file

@ -47,7 +47,7 @@
interrupts = <1>;
clock-frequency = <50000000>;
label = "UART_0";
reg-shift = <2>;
status = "disabled";
};
};

2
dts/nios2/intel/nios2f.dtsi
View file

@ -40,7 +40,7 @@
clock-frequency = <50000000>;
interrupts = <1 0>;
label = "UART_0";
reg-shift = <2>;
status = "disabled";
};