linux-kernel - [PATCH] rtc/spear: Add Device Tree probing capability

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Date:	Mon, 26 Mar 2012 15:24:22 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	<akpm@...ux-foundation.org>
Cc:	<devicetree-discuss@...ts.ozlabs.org>, <rajeev-dlh.kumar@...com>,
	<sr@...x.de>, <linux-kernel@...r.kernel.org>,
	<rtc-linux@...glegroups.com>, <a.zummo@...ertech.it>,
	<spear-devel@...t.st.com>, <viresh.linux@...il.com>,
	Viresh Kumar <viresh.kumar@...com>
Subject: [PATCH] rtc/spear: Add Device Tree probing capability

SPEAr platforms now support DT and so must convert all drivers support DT. This
patch adds DT probing support for rtc and updates its documentation too.

Signed-off-by: Viresh Kumar <viresh.kumar@...com>
---
 Documentation/devicetree/bindings/rtc/spear-rtc.txt |   18 ++++++++++++++++++
 drivers/rtc/rtc-spear.c                             |   10 ++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/spear-rtc.txt

diff --git a/Documentation/devicetree/bindings/rtc/spear-rtc.txt b/Documentation/devicetree/bindings/rtc/spear-rtc.txt
new file mode 100644
index 0000000..928410f
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/spear-rtc.txt
@@ -0,0 +1,18 @@
+* SPEAr RTC
+
+Required properties:
+- compatible : "st,spear-rtc"
+- reg : Address range of the rtc registers
+- interrupt-parent: Should be the phandle for the interrupt controller
+  that services interrupts for this device
+- interrupt: Should contain the rtc interrupt number
+
+Example:
+
+	rtc@...00000 {
+		compatible = "st,spear-rtc";
+		reg = <0xfc000000 0x1000>;
+		interrupt-parent = <&vic1>;
+		interrupts = <12>;
+	};
+
diff --git a/drivers/rtc/rtc-spear.c b/drivers/rtc/rtc-spear.c
index e38da0d..4a12fe5 100644
--- a/drivers/rtc/rtc-spear.c
+++ b/drivers/rtc/rtc-spear.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>
@@ -519,6 +520,14 @@ static void spear_rtc_shutdown(struct platform_device *pdev)
 	clk_disable(config->clk);
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id spear_rtc_id_table[] = {
+	{ .compatible = "st,spear-rtc" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, spear_rtc_id_table);
+#endif
+
 static struct platform_driver spear_rtc_driver = {
 	.probe = spear_rtc_probe,
 	.remove = __devexit_p(spear_rtc_remove),
@@ -527,6 +536,7 @@ static struct platform_driver spear_rtc_driver = {
 	.shutdown = spear_rtc_shutdown,
 	.driver = {
 		.name = "rtc-spear",
+		.of_match_table = of_match_ptr(spear_rtc_id_table),
 	},
 };
 
-- 
1.7.10.rc2.10.gb47606

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