[PATCH 7/9] I2C: MV64XXX: Add Device Tree support
Andrew Lunn
andrew at lunn.ch
Sun Jun 10 20:31:59 EST 2012
Extends the driver to get properties from device tree. Also extend the
kirkwood DT support to supply the needed properties.
Signed-off-by: Andrew Lunn <andrew at lunn.ch>
---
Documentation/devicetree/bindings/i2c/mrvl-i2c.txt | 35 +++++++++++++++++-
arch/arm/boot/dts/kirkwood.dtsi | 13 +++++++
arch/arm/mach-kirkwood/board-dt.c | 2 ++
drivers/i2c/busses/i2c-mv64xxx.c | 38 +++++++++++++++++---
4 files changed, 82 insertions(+), 6 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/mrvl-i2c.txt b/Documentation/devicetree/bindings/i2c/mrvl-i2c.txt
index b891ee2..89ef899 100644
--- a/Documentation/devicetree/bindings/i2c/mrvl-i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/mrvl-i2c.txt
@@ -1,4 +1,4 @@
-* I2C
+* Marvell MMP I2C controller
Required properties :
@@ -32,3 +32,36 @@ Examples:
interrupts = <58>;
};
+* Marvell MV64XXX I2C controller
+
+Required properties :
+
+ - reg : Offset and length of the register set for the device
+ - compatible : should be "marvell,mv64xxx-i2c"
+ - interrupts : the interrupt number
+ - frequency-m : m factor in baud rate calculation
+
+Recommended properties :
+
+ - frequency-n : n factor in baud rate calculation
+ - timeout-ms : How long to wait for a transaction to complete
+
+Baud Rate:
+
+The baud rate is calculated thus:
+
+Fscl = Ftclk
+ ------------------------------------------
+ (frequency-n + 1)
+ 10 *(frequency-m + 1) * 2
+
+Examples:
+
+ i2c at 11000 {
+ compatible = "marvell,mv64xxx-i2c";
+ reg = <0x11000 0x20>;
+ interrupts = <29>;
+ frequency-m = <4>;
+ frequency-n = <4>;
+ timeout-ms = <1000>;
+ };
diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
index 7d282ab..3091c01 100644
--- a/arch/arm/boot/dts/kirkwood.dtsi
+++ b/arch/arm/boot/dts/kirkwood.dtsi
@@ -63,5 +63,18 @@
/* set partition map and/or chip-delay in board dts */
status = "disabled";
};
+
+ i2c at 11000 {
+ compatible = "marvell,mv64xxx-i2c";
+ reg = <0x11000 0x20>;
+ interrupt = <29>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ interrupts = <29>;
+ frequency-m = <8>;
+ frequency-n = <3>;
+ timeout-ms = <1000>;
+ status = "disable";
+ };
};
};
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 0942139..5aa025d 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -28,6 +28,8 @@ static struct of_device_id kirkwood_dt_match_table[] __initdata = {
struct of_dev_auxdata kirkwood_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("marvell,orion-spi", 0xf1010600, "orion_spi.0", NULL),
+ OF_DEV_AUXDATA("marvell,mv64xxx-i2c", 0xf1011000, "mv64xxx_i2c.0",
+ NULL),
{},
};
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 4f44a33..2146984 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -18,6 +18,9 @@
#include <linux/mv643xx_i2c.h>
#include <linux/platform_device.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_i2c.h>
/* Register defines */
#define MV64XXX_I2C_REG_SLAVE_ADDR 0x00
@@ -528,7 +531,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
struct mv64xxx_i2c_pdata *pdata = pd->dev.platform_data;
int rc;
- if ((pd->id != 0) || !pdata)
+ if ((!pdata && !pd->dev.of_node) || (pdata && (pd->id != 0)))
return -ENODEV;
drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
@@ -546,19 +549,35 @@ mv64xxx_i2c_probe(struct platform_device *pd)
init_waitqueue_head(&drv_data->waitq);
spin_lock_init(&drv_data->lock);
- drv_data->freq_m = pdata->freq_m;
- drv_data->freq_n = pdata->freq_n;
- drv_data->irq = platform_get_irq(pd, 0);
+ if (pd->dev.of_node) {
+ of_property_read_u32(pd->dev.of_node, "frequency-m",
+ &drv_data->freq_m);
+ of_property_read_u32(pd->dev.of_node, "frequency-n",
+ &drv_data->freq_n);
+ drv_data->irq = irq_of_parse_and_map(pd->dev.of_node, 0);
+ } else {
+ drv_data->freq_m = pdata->freq_m;
+ drv_data->freq_n = pdata->freq_n;
+ drv_data->irq = platform_get_irq(pd, 0);
+ }
+
if (drv_data->irq < 0) {
rc = -ENXIO;
goto exit_unmap_regs;
}
+
drv_data->adapter.dev.parent = &pd->dev;
drv_data->adapter.algo = &mv64xxx_i2c_algo;
drv_data->adapter.owner = THIS_MODULE;
drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- drv_data->adapter.timeout = msecs_to_jiffies(pdata->timeout);
+ if (pd->dev.of_node)
+ drv_data->adapter.timeout = msecs_to_jiffies(
+ of_property_read_u32(pd->dev.of_node, "timeout-ms",
+ &drv_data->freq_n));
+ else
+ drv_data->adapter.timeout = msecs_to_jiffies(pdata->timeout);
drv_data->adapter.nr = pd->id;
+ drv_data->adapter.dev.of_node = pd->dev.of_node;
platform_set_drvdata(pd, drv_data);
i2c_set_adapdata(&drv_data->adapter, drv_data);
@@ -577,6 +596,8 @@ mv64xxx_i2c_probe(struct platform_device *pd)
goto exit_free_irq;
}
+ of_i2c_register_devices(&drv_data->adapter);
+
return 0;
exit_free_irq:
@@ -602,12 +623,19 @@ mv64xxx_i2c_remove(struct platform_device *dev)
return rc;
}
+static const struct of_device_id mv64xxx_i2c_of_match_table[] __devinitdata = {
+ { .compatible = "marvell,mv64xxx-i2c", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mv64xxx_i2c_of_match_table);
+
static struct platform_driver mv64xxx_i2c_driver = {
.probe = mv64xxx_i2c_probe,
.remove = __devexit_p(mv64xxx_i2c_remove),
.driver = {
.owner = THIS_MODULE,
.name = MV64XXX_I2C_CTLR_NAME,
+ .of_match_table = of_match_ptr(mv64xxx_i2c_of_match_table),
},
};
--
1.7.10
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