clocksource: sh_mtu2: Add DT support

Document DT bindings and parse them in the MTU2 driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Wolfram Sang <wsa@sang-engineering.com>
(cherry picked from commit cca8d0596c4c7acb371ea1bc5eee9b404b30516a)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/Documentation/devicetree/bindings/timer/renesas,mtu2.txt b/Documentation/devicetree/bindings/timer/renesas,mtu2.txt
new file mode 100644 (file)
index 0000000..917453f
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/renesas,mtu2.txt
@@ -0,0 +1,39 @@
+* Renesas R-Car Multi-Function Timer Pulse Unit 2 (MTU2)
+
+The MTU2 is a multi-purpose, multi-channel timer/counter with configurable
+clock inputs and programmable compare match.
+
+Channels share hardware resources but their counter and compare match value
+are independent. The MTU2 hardware supports five channels indexed from 0 to 4.
+
+Required Properties:
+
+  - compatible: must contain "renesas,mtu2"
+
+  - reg: base address and length of the registers block for the timer module.
+
+  - interrupts: interrupt specifiers for the timer, one for each entry in
+    interrupt-names.
+  - interrupt-names: must contain one entry named "tgi?a" for each enabled
+    channel, where "?" is the channel index expressed as one digit from "0" to
+    "4".
+
+  - clocks: a list of phandle + clock-specifier pairs, one for each entry
+    in clock-names.
+  - clock-names: must contain "fck" for the functional clock.
+
+
+Example: R7S72100 (RZ/A1H) MTU2 node
+
+       mtu2: timer@fcff0000 {
+               compatible = "renesas,mtu2";
+               reg = <0xfcff0000 0x400>;
+               interrupts = <0 139 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 146 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 150 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 154 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 159 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-names = "tgi0a", "tgi1a", "tgi2a", "tgi3a", "tgi4a";
+               clocks = <&mstp3_clks R7S72100_CLK_MTU2>;
+               clock-names = "fck";
+       };

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index b0c229f..3d88698 100644 (file)
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -23,6 +23,7 @@
 #include <linux/ioport.h>
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -500,11 +501,18 @@ static const struct platform_device_id sh_mtu2_id_table[] = {
 };
 MODULE_DEVICE_TABLE(platform, sh_mtu2_id_table);
 
+static const struct of_device_id sh_mtu2_of_table[] __maybe_unused = {
+       { .compatible = "renesas,mtu2" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, sh_mtu2_of_table);
+
 static struct platform_driver sh_mtu2_device_driver = {
        .probe          = sh_mtu2_probe,
        .remove         = sh_mtu2_remove,
        .driver         = {
                .name   = "sh_mtu2",
+               .of_match_table = of_match_ptr(sh_mtu2_of_table),
        },
        .id_table       = sh_mtu2_id_table,
 };