diff mbox series

[v2,1/2] pwm: Add DT documentation for SiFive PWM Controller

Message ID 1587641236-5026-2-git-send-email-yash.shah@sifive.com
State Accepted
Commit 0dae9e24ea71d6cc21cb5c2804efeb3aedcbdc96
Headers show
Series Add support for PWM SiFive | expand

Commit Message

Yash Shah April 23, 2020, 11:27 a.m. UTC
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 at sifive.com>
---
 doc/device-tree-bindings/pwm/pwm-sifive.txt | 31 +++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 doc/device-tree-bindings/pwm/pwm-sifive.txt

Comments

Heiko Schocher July 8, 2020, 4:29 a.m. UTC | #1
Hello Yash,

Am 23.04.2020 um 13:27 schrieb Yash Shah:
> 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 at sifive.com>
> ---
>   doc/device-tree-bindings/pwm/pwm-sifive.txt | 31 +++++++++++++++++++++++++++++
>   1 file changed, 31 insertions(+)
>   create mode 100644 doc/device-tree-bindings/pwm/pwm-sifive.txt

Reviewed-by: Heiko Schocher <hs at denx.de>

@Tom: Do you want to pick up this patch, or I can take it into
u-boot-i2c tree (as I currently plan to send a pull request)?

bye,
Heiko
Heiko Schocher July 9, 2020, 8:26 a.m. UTC | #2
Hello Yash,

Am 23.04.2020 um 13:27 schrieb Yash Shah:
> 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 at sifive.com>
> ---
>   doc/device-tree-bindings/pwm/pwm-sifive.txt | 31 +++++++++++++++++++++++++++++
>   1 file changed, 31 insertions(+)
>   create mode 100644 doc/device-tree-bindings/pwm/pwm-sifive.txt

Applied to u-boot-i2c.git master

Thanks!

bye,
Heiko
diff mbox series

Patch

diff --git a/doc/device-tree-bindings/pwm/pwm-sifive.txt b/doc/device-tree-bindings/pwm/pwm-sifive.txt
new file mode 100644
index 0000000..9a98837
--- /dev/null
+++ b/doc/device-tree-bindings/pwm/pwm-sifive.txt
@@ -0,0 +1,31 @@ 
+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 at 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>;
+};