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pwm: Add DT documentation for SiFive PWM Controller

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DT documentation for PWM controller added from Linux v5.6

commit: daa78cc3408e
("pwm: sifive: Add DT documentation for SiFive PWM Controller")

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Yash Shah 2020-04-23 16:57:15 +05:30 committed by Heiko Schocher
parent 7ce87dcff4
commit 0dae9e24ea
1 changed files with 31 additions and 0 deletions
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doc/device-tree-bindings/pwm/pwm-sifive.txt Normal file
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SiFive PWM controller
Unlike most other PWM controllers, the SiFive PWM controller currently only
supports one period for all channels in the PWM. All PWMs need to run at
the same period. The period also has significant restrictions on the values
it can achieve, which the driver rounds to the nearest achievable period.
PWM RTL that corresponds to the IP block version numbers can be found
here:
https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm
Required properties:
- compatible: Should be "sifive,<chip>-pwm" and "sifive,pwm<version>".
Supported compatible strings are: "sifive,fu540-c000-pwm" for the SiFive
PWM v0 as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the
SiFive PWM v0 IP block with no chip integration tweaks.
- reg: physical base address and length of the controller's registers
- clocks: Should contain a clock identifier for the PWM's parent clock.
- #pwm-cells: Should be 3.
- interrupts: one interrupt per PWM channel
Examples:
pwm: pwm@10020000 {
compatible = "sifive,fu540-c000-pwm", "sifive,pwm0";
reg = <0x0 0x10020000 0x0 0x1000>;
clocks = <&tlclk>;
interrupt-parent = <&plic>;
interrupts = <42 43 44 45>;
#pwm-cells = <3>;
};