On Tue, May 21, 2019 at 04:51:31PM +0200, Paul Cercueil wrote:
> Add documentation about how to properly use the Ingenic TCU
> (Timer/Counter Unit) drivers from devicetree.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
>
> Notes:
> v4: New patch in this series. Corresponds to V2 patches 3-4-5 with
> added content.
>
> v5: - Edited PWM/watchdog DT bindings documentation to point to the new
> document.
> - Moved main document to
> Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> - Updated documentation to reflect the new devicetree bindings.
>
> v6: - Removed PWM/watchdog documentation files as asked by upstream
> - Removed doc about properties that should be implicit
> - Removed doc about ingenic,timer-channel /
> ingenic,clocksource-channel as they are gone
> - Fix WDT clock name in the binding doc
> - Fix lengths of register areas in watchdog/pwm nodes
>
> v7: No change
>
> v8: - Fix address of the PWM node
> - Added doc about system timer and clocksource children nodes
>
> v9: - Remove doc about system timer and clocksource children
> nodes...
> - Add doc about ingenic,pwm-channels-mask property
>
> v10: No change
>
> v11: Fix info about default value of ingenic,pwm-channels-mask
>
> v12: Drop sub-nodes for now; they will be introduced in a follow-up
> patchset.
Why? I believe I acked them.
>
> .../devicetree/bindings/timer/ingenic,tcu.txt | 59 +++++++++++++++++++
> 1 file changed, 59 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>
> diff --git a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> new file mode 100644
> index 000000000000..d101cd72c9b0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> @@ -0,0 +1,59 @@
> +Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
> +==========================================================
> +
> +For a description of the TCU hardware and drivers, have a look at
> +Documentation/mips/ingenic-tcu.txt.
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> + * "ingenic,jz4740-tcu"
> + * "ingenic,jz4725b-tcu"
> + * "ingenic,jz4770-tcu"
> +- reg: Should be the offset/length value corresponding to the TCU registers
> +- clocks: List of phandle & clock specifiers for clocks external to the TCU.
> + The "pclk", "rtc" and "ext" clocks should be provided. The "tcu" clock
> + should be provided if the SoC has it.
> +- clock-names: List of name strings for the external clocks.
> +- #clock-cells: Should be <1>;
> + Clock consumers specify this argument to identify a clock. The valid values
> + may be found in <dt-bindings/clock/ingenic,tcu.h>.
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- #interrupt-cells : Specifies the number of cells needed to encode an
> + interrupt source. The value should be 1.
> +- interrupt-parent : phandle of the interrupt controller.
Drop this 'interrupt-parent' is implied and could be in a parent node.
> +- interrupts : Specifies the interrupt the controller is connected to.
> +
> +Optional properties:
> +
> +- ingenic,pwm-channels-mask: Bitmask of TCU channels reserved for PWM use.
> + Default value is 0xfc.
> +
> +
> +Example
> +==========================================================
> +
> +#include <dt-bindings/clock/jz4770-cgu.h>
> +
> +/ {
> + tcu: timer@10002000 {
> + compatible = "ingenic,jz4770-tcu";
> + reg = <0x10002000 0x1000>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x0 0x10002000 0x1000>;
> +
> + #clock-cells = <1>;
> +
> + clocks = <&cgu JZ4770_CLK_RTC
> + &cgu JZ4770_CLK_EXT
> + &cgu JZ4770_CLK_PCLK>;
> + clock-names = "rtc", "ext", "pclk";
> +
> + interrupt-controller;
> + #interrupt-cells = <1>;
> +
> + interrupt-parent = <&intc>;
> + interrupts = <27 26 25>;
> + };
> +};
> --
> 2.21.0.593.g511ec345e18
>
