dt-bindings: timer: Update TI timer to yaml

Let's update the TI timer binding to use yaml. As this binding is specific
to the TI dual-mode timers also known as dm-timers, let's use file name
ti,timer-dm.yaml to avoid confusion with other timers.

We add checks for the deprecated ti,hwmods property as done for other TI
device driver bindings earlier.

We also correct the issue with the old binding that was out of date for
several properties.

The am43 related timers are undocumented, but compatible with the am3
timers. Let's add the am43 timers too.

The dm814 and dm816 timers are missing, let's add them.

Some timers on some SoCs are dual mapped, like the ABE timers on omap4
and 5. The reg property maxItems must be updated to 2.

The timer clocks can be managed by the parent interconnect target module
with no clocks assigned for the timer node. And in some cases, the SoC may
need to configure additional system clock for the timer in addition to the
functional clock.

The clock names are optional and not specific to the comptible property.
For example, dra7 timers on l3 interconnect do not need clock-names, while
the timers on dra7 l4 interconnect need them with both being compatible
with ti,omap5430-timer.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220414085807.7389-2-tony@atomide.com

1 files changed, 142 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/timer/ti,timer-dm.yaml b/Documentation/devicetree/bindings/timer/ti,timer-dm.yaml
new file mode 100644
index 000000000000..7c0eb53a944b
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/ti,timer-dm.yaml
@@ -0,0 +1,142 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/ti,timer-dm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI dual-mode timer
+
+maintainers:
+  - Tony Lindgren <tony@atomide.com>
+
+description: |
+  The TI dual-mode timer is a general purpose timer with PWM capabilities.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - ti,am335x-timer
+              - ti,am335x-timer-1ms
+              - ti,dm814-timer
+              - ti,dm816-timer
+              - ti,omap2420-timer
+              - ti,omap3430-timer
+              - ti,omap4430-timer
+              - ti,omap5430-timer
+      - items:
+          - const: ti,am4372-timer
+          - const: ti,am335x-timer
+      - items:
+          - const: ti,am4372-timer-1ms
+          - const: ti,am335x-timer-1ms
+
+  reg:
+    items:
+      - description: IO address
+      - description: L3 to L4 mapping for omap4/5 L4 ABE
+    minItems: 1
+
+  clocks:
+    items:
+      - description: Functional clock
+      - description: System clock for omap4/5 and dra7
+    minItems: 1
+
+  clock-names:
+    items:
+      - const: fck
+      - const: timer_sys_ck
+    minItems: 1
+
+  interrupts:
+    description:
+      Interrupt if available. The timer PWM features may be usable
+      in a limited way even without interrupts.
+    maxItems: 1
+
+  ti,timer-alwon:
+    description:
+      Timer is always enabled when the SoC is powered. Note that some SoCs like
+      am335x can suspend to PM coprocessor RTC only mode and in that case the
+      SoC power is cut including timers.
+    type: boolean
+
+  ti,timer-dsp:
+    description:
+      Timer is routable to the DSP in addition to the operating system.
+    type: boolean
+
+  ti,timer-pwm:
+    description:
+      Timer has been wired for PWM capability.
+    type: boolean
+
+  ti,timer-secure:
+    description:
+      Timer access has been limited to secure mode only.
+    type: boolean
+
+  ti,hwmods:
+    description:
+      Name of the HWMOD associated with timer. This is for legacy
+      omap2/3 platforms only.
+    $ref: /schemas/types.yaml#/definitions/string
+    deprecated: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - ti,omap3430-timer
+                - ti,omap4430-timer
+                - ti,omap5430-timer
+    then:
+      properties:
+        reg:
+          maxItems: 1
+        clocks:
+          maxItems: 1
+        clock-names:
+          maxItems: 1
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - ti,dm814-timer
+              - ti,dm816-timer
+              - ti,omap2420-timer
+              - ti,omap3430-timer
+    then:
+      properties:
+        ti,hwmods:
+          items:
+            - pattern: "^timer([1-9]|1[0-2])$"
+    else:
+      properties:
+        ti,hwmods: false
+
+examples:
+  - |
+    timer1: timer@0 {
+      compatible = "ti,am335x-timer-1ms";
+      reg = <0x0 0x400>;
+      interrupts = <67>;
+      ti,timer-alwon;
+      clocks = <&timer1_fck>;
+      clock-names = "fck";
+    };
+...