It adds device tree probe support for i2c-imx driver.
Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Darius Augulis <augulis.darius@xxxxxxxxx>
Cc: Ben Dooks <ben-linux@xxxxxxxxx>
---
.../devicetree/bindings/i2c/fsl-imx-i2c.txt | 25 ++++++++++++++++++++
drivers/i2c/busses/i2c-imx.c | 25 +++++++++++++++----
2 files changed, 44 insertions(+), 6 deletions(-)
create mode 100644 Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
diff --git a/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
new file mode 100644
index 0000000..5066cd9
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
@@ -0,0 +1,25 @@
+* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX
+
+Required properties:
+- compatible : Should be "fsl,<chip>-i2c"
+- reg : Should contain I2C/HS-I2C registers location and length
+- interrupts : Should contain I2C/HS-I2C interrupt
+
+Optional properties:
+- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.
+ The absence of the propoerty indicates the default frequency 100 kHz.
+
+Examples:
+
+i2c@83fc4000 { /* I2C2 on i.MX51 */
+ compatible = "fsl,imx51-i2c", "fsl,imx1-i2c";
+ reg = <0x83fc4000 0x4000>;
+ interrupts = <63>;
+};
+
+i2c@70038000 { /* HS-I2C on i.MX51 */
+ compatible = "fsl,imx51-i2c", "fsl,imx1-i2c";
+ reg = <0x70038000 0x4000>;
+ interrupts = <63>;
+ clock-frequency = <400000>
+};
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 54d809e..58832e5 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -48,6 +48,9 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_i2c.h>
#include <mach/irqs.h>
#include <mach/hardware.h>
@@ -125,6 +128,11 @@ struct imx_i2c_struct {
unsigned int ifdr; /* IMX_I2C_IFDR */
};
+static const struct of_device_id i2c_imx_dt_ids[] = {
+ { .compatible = "fsl,imx1-i2c", },
+ { /* sentinel */ }
+};
+
/** Functions for IMX I2C adapter driver ***************************************
*******************************************************************************/
@@ -469,7 +477,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
void __iomem *base;
resource_size_t res_size;
- int irq;
+ int irq, bitrate;
int ret;
dev_dbg(&pdev->dev, "<%s>\n", __func__);
@@ -512,6 +520,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
i2c_imx->adapter.algo = &i2c_imx_algo;
i2c_imx->adapter.dev.parent = &pdev->dev;
i2c_imx->adapter.nr = pdev->id;
+ i2c_imx->adapter.dev.of_node = pdev->dev.of_node;
i2c_imx->irq = irq;
i2c_imx->base = base;
i2c_imx->res = res;
@@ -538,10 +547,12 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
/* Set up clock divider */
- if (pdata && pdata->bitrate)
- i2c_imx_set_clk(i2c_imx, pdata->bitrate);
- else
- i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE);
+ bitrate = IMX_I2C_BIT_RATE;
+ ret = of_property_read_u32(pdev->dev.of_node,
+ "clock-frequency", &bitrate);
+ if (ret < 0 && pdata && pdata->bitrate)
+ bitrate = pdata->bitrate;
+ i2c_imx_set_clk(i2c_imx, bitrate);
/* Set up chip registers to defaults */
writeb(0, i2c_imx->base + IMX_I2C_I2CR);
@@ -554,6 +565,8 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
goto fail5;
}
+ of_i2c_register_devices(&i2c_imx->adapter);
+
/* Set up platform driver data */
platform_set_drvdata(pdev, i2c_imx);
@@ -584,7 +597,6 @@ fail1:
static int __exit i2c_imx_remove(struct platform_device *pdev)
{
struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
- struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
/* remove adapter */
dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
@@ -613,6 +625,7 @@ static struct platform_driver i2c_imx_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = i2c_imx_dt_ids,
}
};
--
1.7.4.1
--
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