On Wed, Dec 12, 2018 at 11:08:58PM +0100, 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
I thought we'd sorted this out...
>
> .../devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt | 25 ---
> .../devicetree/bindings/timer/ingenic,tcu.txt | 176 +++++++++++++++++++++
> .../bindings/watchdog/ingenic,jz4740-wdt.txt | 17 --
> 3 files changed, 176 insertions(+), 42 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> create mode 100644 Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> delete mode 100644 Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
>
> diff --git a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> deleted file mode 100644
> index 7d9d3f90641b..000000000000
> --- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> +++ /dev/null
> @@ -1,25 +0,0 @@
> -Ingenic JZ47xx PWM Controller
> -=============================
> -
> -Required properties:
> -- compatible: One of:
> - * "ingenic,jz4740-pwm"
> - * "ingenic,jz4770-pwm"
> - * "ingenic,jz4780-pwm"
> -- #pwm-cells: Should be 3. See pwm.txt in this directory for a description
> - of the cells format.
> -- clocks : phandle to the external clock.
> -- clock-names : Should be "ext".
> -
> -
> -Example:
> -
> - pwm: pwm@10002000 {
> - compatible = "ingenic,jz4740-pwm";
> - reg = <0x10002000 0x1000>;
> -
> - #pwm-cells = <3>;
> -
> - clocks = <&ext>;
> - clock-names = "ext";
> - };
> diff --git a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> new file mode 100644
> index 000000000000..8a4ce7edf50f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> @@ -0,0 +1,176 @@
> +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", "ext" and "tcu" clocks should be provided.
> +- 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.
> +- interrupts : Specifies the interrupt the controller is connected to.
> +
> +
> +Children nodes
> +==========================================================
> +
> +
> +PWM node:
> +---------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> + * ingenic,jz4740-pwm
> + * ingenic,jz4725b-pwm
> +- #pwm-cells: Should be 3. See ../pwm/pwm.txt for a description of the cell
> + format.
> +- clocks: List of phandle & clock specifiers for the TCU clocks.
> +- clock-names: List of name strings for the TCU clocks.
> +
> +
> +Watchdog node:
> +--------------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> + * ingenic,jz4740-watchdog
> + * ingenic,jz4780-watchdog
> +- clocks: phandle to the WDT clock
> +- clock-names: should be "wdt"
> +
> +
> +OST node:
> +---------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> + * ingenic,jz4725b-ost
> + * ingenic,jz4770-ost
> +- clocks: phandle to the OST clock
> +- clock-names: should be "ost"
> +- interrupts : Specifies the interrupt the OST is connected to.
> +
> +
> +System timer node:
> +------------------
> +
> +Required properties:
> +
> +- compatible: Must be "ingenic,jz4740-tcu-timer"
Is this an actual sub-block? Or just a way to assign a timer to a
clockevent?
> +- clocks: phandle to the clock of the TCU channel used
> +- clock-names: Should be "timer"
> +- interrupts : Specifies the interrupt line of the TCU channel used.
> +
> +
> +System clocksource node:
> +------------------------
> +
> +Required properties:
> +
> +- compatible: Must be "ingenic,jz4740-tcu-clocksource"
The h/w has a block called 'clocksource'?
If there's a difference in the timer channels, then that difference
should be described in DT, not just 'use timer X for clocksource'.
> +- clocks: phandle to the clock of the TCU channel used
> +- clock-names: Should be "timer"
