This patch adapts the i2c-ocores driver for being defined and configured via
a device tree description.
The device tree bits need to be protected by CONFIG_OF guards as this is
still an optional feature.
Signed-off-by: Jonas Bonn <jonas@xxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-ocores.c | 64 ++++++++++++++++++++++++++++++++++-----
1 files changed, 56 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index 0070371..c05e8c4 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -210,6 +210,32 @@ static struct i2c_adapter ocores_adapter = {
.algo = &ocores_algorithm,
};
+#ifdef CONFIG_OF
+static int ocores_i2c_of_probe(struct platform_device* pdev,
+ struct ocores_i2c* i2c)
+{
+ __be32* val;
+
+ val = of_get_property(pdev->dev.of_node, "regstep", NULL);
+ if (!val) {
+ dev_err(&pdev->dev, "Missing required parameter 'regstep'");
+ return -ENODEV;
+ }
+ i2c->regstep = be32_to_cpup(val);
+
+ val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL);
+ if (!val) {
+ dev_err(&pdev->dev,
+ "Missing required parameter 'clock-frequency'");
+ return -ENODEV;
+ }
+ i2c->clock_khz = be32_to_cpup(val) / 1000;
+
+ return 0;
+}
+#else
+#define ocores_i2c_of_probe(pdev,i2c) -ENODEV
+#endif
static int __devinit ocores_i2c_probe(struct platform_device *pdev)
{
@@ -227,10 +253,6 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
if (!res2)
return -ENODEV;
- pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data;
- if (!pdata)
- return -ENODEV;
-
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
@@ -249,8 +271,16 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
goto map_failed;
}
- i2c->regstep = pdata->regstep;
- i2c->clock_khz = pdata->clock_khz;
+ pdata = pdev->dev.platform_data;
+ if (pdata) {
+ i2c->regstep = pdata->regstep;
+ i2c->clock_khz = pdata->clock_khz;
+ } else {
+ ret = ocores_i2c_of_probe(pdev, i2c);
+ if (ret)
+ return ret;
+ }
+
ocores_init(i2c);
init_waitqueue_head(&i2c->wait);
@@ -265,6 +295,9 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
i2c->adap = ocores_adapter;
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &pdev->dev;
+#ifdef CONFIG_OF
+ i2c->adap.dev.of_node = pdev->dev.of_node;
+#endif
/* add i2c adapter to i2c tree */
ret = i2c_add_adapter(&i2c->adap);
@@ -274,8 +307,10 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
}
/* add in known devices to the bus */
- for (i = 0; i < pdata->num_devices; i++)
- i2c_new_device(&i2c->adap, pdata->devices + i);
+ if (pdata) {
+ for (i = 0; i < pdata->num_devices; i++)
+ i2c_new_device(&i2c->adap, pdata->devices + i);
+ }
return 0;
@@ -344,6 +379,16 @@ static int ocores_i2c_resume(struct platform_device *pdev)
#define ocores_i2c_resume NULL
#endif
+#ifdef CONFIG_OF
+static struct of_device_id ocores_i2c_match[] = {
+ {
+ .compatible = "opencores,i2c-ocores",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ocores_i2c_match);
+#endif
+
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:ocores-i2c");
@@ -355,6 +400,9 @@ static struct platform_driver ocores_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ocores-i2c",
+#ifdef CONFIG_OF
+ .of_match_table = ocores_i2c_match,
+#endif
},
};
--
1.7.1
--
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