[PATCH] rtc: ds1511: add device-tree bindings

Marcus Folkesson
2013-11-22T07:17:23Z

Compatible with ds1500, ds1501 and ds1511

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
---
.../devicetree/bindings/rtc/maxim-ds1511.txt | 18 +++++
drivers/rtc/rtc-ds1511.c | 85 +++++++++++++++++---
2 files changed, 90 insertions(+), 13 deletions(-)
create mode 100644 Documentation/devicetree/bindings/rtc/maxim-ds1511.txt

diff --git a/Documentation/devicetree/bindings/rtc/maxim-ds1511.txt b/Documentation/devicetree/bindings/rtc/maxim-ds1511.txt
new file mode 100644
index 0000000..17fa356
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/maxim-ds1511.txt
@@ -0,0 +1,18 @@
+* Maxim Real Time Clock
+
+
+Support for Maxim DS1500, DS1501 and DS1511 RTC.
+
+Required properties:
+- compatible : Should be "maxim,ds1500-rtc", "maxim,ds1501-rtc" or "maxim,ds1511-rtc".
+- reg: physical base address of the controller and length of memory mapped
+ region.
+- interrupts: IRQ line for the RTC.
+
+Example:
+
+rtc@10300 {
+ compatible = "maxim,ds1511-rtc";
+ reg = <0xd0010300 0x20>;
+ interrupts = <50>;
+};
diff --git a/drivers/rtc/rtc-ds1511.c b/drivers/rtc/rtc-ds1511.c
index 6a3fcfe..3778a8e 100644
--- a/drivers/rtc/rtc-ds1511.c
+++ b/drivers/rtc/rtc-ds1511.c
@@ -24,6 +24,9 @@
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>

#define DRV_VERSION "0.6"

@@ -476,6 +479,52 @@ static struct bin_attribute ds1511_nvram_attr = {
.write = ds1511_nvram_write,
};

+
+
+#ifdef CONFIG_OF
+static int ds1511_of_probe(struct platform_device *pdev,
+ struct rtc_plat_data *pdata)
+{
+ struct device *dev = &pdev->dev;
+ u32 val;
+ int ret;
+ struct resource res;
+
+ ret = of_address_to_resource(&pdev->dev.of_node, 0, &res);
+ if (ret)
+ return -ENODEV;
+
+ pdata->size = resource_size(&res);
+
+ if (!devm_request_mem_region(&pdev->dev, res.start, pdata->size,
+ pdev->name))
+ return -EBUSY;
+
+ ds1511_base = devm_ioremap(&pdev->dev, res.start, pdata->size);
+ if (!ds1511_base)
+ return -ENOMEM;
+
+ pdata->ioaddr = ds1511_base;
+ pdata->irq = irq_of_parse_and_map(&pdev->dev.of_node, 0);
+
+ return 0;
+}
+
+static const struct of_device_id rtc_of_match[] = {
+ { .compatible = "maxim,ds1500-rtc" },
+ { .compatible = "maxim,ds1501-rtc" },
+ { .compatible = "maxim,ds1511-rtc" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rtc_of_match);
+
+#else
+static int ds1511_of_probe(struct platform_device *pdev, struct rtc_plat_data *pdata)
+{
+ return -ENODEV;
+}
+#endif
+
static int ds1511_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
@@ -483,22 +532,31 @@ static int ds1511_rtc_probe(struct platform_device *pdev)
struct rtc_plat_data *pdata;
int ret = 0;

- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- return -ENODEV;
- }
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- pdata->size = resource_size(res);
- if (!devm_request_mem_region(&pdev->dev, res->start, pdata->size,
- pdev->name))
- return -EBUSY;
- ds1511_base = devm_ioremap(&pdev->dev, res->start, pdata->size);
- if (!ds1511_base)
- return -ENOMEM;
- pdata->ioaddr = ds1511_base;
- pdata->irq = platform_get_irq(pdev, 0);
+
+ if (pdev->dev.of_node) {
+ ret = ds1511_of_probe(pdev, pdata);
+ if (ret < 0)
+ return ret;
+ } else if (!pdev) {
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ return -ENODEV;
+ }
+ pdata->size = resource_size(res);
+ if (!devm_request_mem_region(&pdev->dev, res->start, pdata->size,
+ pdev->name))
+ return -EBUSY;
+ ds1511_base = devm_ioremap(&pdev->dev, res->start, pdata->size);
+ if (!ds1511_base)
+ return -ENOMEM;
+ pdata->ioaddr = ds1511_base;
+ pdata->irq = platform_get_irq(pdev, 0);
+ } else
+ return -ENODEV;

/*
* turn on the clock and the crystal, etc.
@@ -575,6 +633,7 @@ static struct platform_driver ds1511_rtc_driver = {
.driver = {
.name = "ds1511",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(rtc_of_match),
},
};

--
1.7.10.4