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mfd: twl4030-power: Start transition to DT 

Support for loading twl4030-power module via devicetree.
For now, when booting with a DT, only the poweroff callback
feature is supported through the ti,use_poweroff property.

Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
hifive-unleashed-5.1
Florian Vaussard 2013-06-18 15:17:58 +02:00 committed by Samuel Ortiz
parent f58cb40763
commit b0fc1da4d0
2 changed files with 66 additions and 7 deletions
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28
Documentation/devicetree/bindings/mfd/twl4030-power.txt 100644
View File

@ -0,0 +1,28 @@
Texas Instruments TWL family (twl4030) reset and power management module
The power management module inside the TWL family provides several facilities
to control the power resources, including power scripts. For now, the
binding only supports the complete shutdown of the system after poweroff.
Required properties:
- compatible : must be "ti,twl4030-power"
Optional properties:
- ti,use_poweroff: With this flag, the chip will initiates an ACTIVE-to-OFF or
SLEEP-to-OFF transition when the system poweroffs.
Example:
&i2c1 {
clock-frequency = <2600000>;
twl: twl@48 {
reg = <0x48>;
interrupts = <7>; /* SYS_NIRQ cascaded to intc */
interrupt-parent = <&intc>;
twl_power: power {
compatible = "ti,twl4030-power";
ti,use_poweroff;
};
};
};

45
drivers/mfd/twl4030-power.c
View File

@ -28,6 +28,7 @@
#include <linux/pm.h>
#include <linux/i2c/twl.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <asm/mach-types.h>
@ -540,12 +541,30 @@ void twl4030_power_off(void)
pr_err("TWL4030 Unable to power off\n");
}
static bool twl4030_power_use_poweroff(struct twl4030_power_data *pdata,
struct device_node *node)
{
if (pdata && pdata->use_poweroff)
return true;
if (of_property_read_bool(node, "ti,use_poweroff"))
return true;
return false;
}
int twl4030_power_probe(struct platform_device *pdev)
{
struct twl4030_power_data *pdata = pdev->dev.platform_data;
struct device_node *node = pdev->dev.of_node;
int err = 0;
u8 val;
if (!pdata && !node) {
dev_err(&pdev->dev, "Platform data is missing\n");
return -EINVAL;
}
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
TWL4030_PM_MASTER_PROTECT_KEY);
if (err)
@ -556,15 +575,18 @@ int twl4030_power_probe(struct platform_device *pdev)
if (err)
goto unlock;
err = twl4030_power_configure_scripts(pdata);
if (err)
goto load;
err = twl4030_power_configure_resources(pdata);
if (err)
goto resource;
if (pdata) {
/* TODO: convert to device tree */
err = twl4030_power_configure_scripts(pdata);
if (err)
goto load;
err = twl4030_power_configure_resources(pdata);
if (err)
goto resource;
}
/* Board has to be wired properly to use this feature */
if (pdata->use_poweroff && !pm_power_off) {
if (twl4030_power_use_poweroff(pdata, node) && !pm_power_off) {
/* Default for SEQ_OFFSYNC is set, lets ensure this */
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
TWL4030_PM_MASTER_CFG_P123_TRANSITION);
@ -610,10 +632,19 @@ static int twl4030_power_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id twl4030_power_of_match[] = {
{.compatible = "ti,twl4030-power", },
{ },
};
MODULE_DEVICE_TABLE(of, twl4030_power_of_match);
#endif
static struct platform_driver twl4030_power_driver = {
.driver = {
.name = "twl4030_power",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(twl4030_power_of_match),
},
.probe = twl4030_power_probe,
.remove = twl4030_power_remove,