diff options
| -rw-r--r-- | Documentation/devicetree/bindings/mfd/twl4030-power.txt | 28 | ||||
| -rw-r--r-- | drivers/mfd/twl4030-power.c | 45 |
2 files changed, 66 insertions, 7 deletions
diff --git a/Documentation/devicetree/bindings/mfd/twl4030-power.txt b/Documentation/devicetree/bindings/mfd/twl4030-power.txt new file mode 100644 index 000000000000..8e15ec35ac99 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/twl4030-power.txt @@ -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; + }; + }; +}; diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c index d36622d0f98a..5b2848280f4b 100644 --- a/drivers/mfd/twl4030-power.c +++ b/drivers/mfd/twl4030-power.c @@ -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, |