[PATCH v15 03/13] dt-bindings: Add doc for the Ingenic TCU drivers

From: Paul Cercueil
Date: Wed Jul 24 2019 - 13:17:10 EST

Add documentation about how to properly use the Ingenic TCU
(Timer/Counter Unit) drivers from devicetree.

Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Mathieu Malaterre <malat@xxxxxxxxxx>
Tested-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
---

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.

v13:
- Revert back to v11. Turns out it was okay.
- Remove 'interrupt-parent' of the list of required properties.

v14: No change

v15: Add "simple-mfd" compatible string

.../bindings/pwm/ingenic,jz47xx-pwm.txt | 22 ---
.../devicetree/bindings/timer/ingenic,tcu.txt | 137 ++++++++++++++++++
.../bindings/watchdog/ingenic,jz4740-wdt.txt | 17 ---
3 files changed, 137 insertions(+), 39 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 493bec80d59b..000000000000
--- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
+++ /dev/null
@@ -1,22 +0,0 @@
-Ingenic JZ47xx PWM Controller
-=============================
-
-Required properties:
-- compatible: Should be "ingenic,jz4740-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..5a4b9ddd9470
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
@@ -0,0 +1,137 @@
+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
+ followed by "simple-mfd".
+- 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.
+- 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.
+
+
+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 "ingenic,jz4740-watchdog"
+- clocks: phandle to the WDT clock
+- clock-names: should be "wdt"
+
+
+OS Timer 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.
+
+
+Example
+==========================================================
+
+#include <dt-bindings/clock/jz4770-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+/ {
+ tcu: timer@10002000 {
+ compatible = "ingenic,jz4770-tcu", "simple-mfd";
+ 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>;
+
+ watchdog: watchdog@0 {
+ compatible = "ingenic,jz4740-watchdog";
+ reg = <0x0 0xc>;
+
+ clocks = <&tcu TCU_CLK_WDT>;
+ clock-names = "wdt";
+ };
+
+ pwm: pwm@40 {
+ compatible = "ingenic,jz4740-pwm";
+ reg = <0x40 0x80>;
+
+ #pwm-cells = <3>;
+
+ clocks = <&tcu TCU_CLK_TIMER0
+ &tcu TCU_CLK_TIMER1
+ &tcu TCU_CLK_TIMER2
+ &tcu TCU_CLK_TIMER3
+ &tcu TCU_CLK_TIMER4
+ &tcu TCU_CLK_TIMER5
+ &tcu TCU_CLK_TIMER6
+ &tcu TCU_CLK_TIMER7>;
+ clock-names = "timer0", "timer1", "timer2", "timer3",
+ "timer4", "timer5", "timer6", "timer7";
+ };
+
+ ost: timer@e0 {
+ compatible = "ingenic,jz4770-ost";
+ reg = <0xe0 0x20>;
+
+ clocks = <&tcu TCU_CLK_OST>;
+ clock-names = "ost";
+
+ interrupts = <15>;
+ };
+ };
+};
diff --git a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
deleted file mode 100644
index ce1cb72d5345..000000000000
--- a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-Ingenic Watchdog Timer (WDT) Controller for JZ4740 & JZ4780
-
-Required properties:
-compatible: "ingenic,jz4740-watchdog" or "ingenic,jz4780-watchdog"
-reg: Register address and length for watchdog registers
-clocks: phandle to the RTC clock
-clock-names: should be "rtc"
-
-Example:
-
-watchdog: jz4740-watchdog@10002000 {
- compatible = "ingenic,jz4740-watchdog";
- reg = <0x10002000 0x10>;
-
- clocks = <&cgu JZ4740_CLK_RTC>;
- clock-names = "rtc";
-};
--
2.21.0.593.g511ec345e18