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.vauss...@epfl.ch>
---
.../devicetree/bindings/mfd/twl4030-power.txt | 28 ++++++++++++
drivers/mfd/twl4030-power.c | 45 ++++++++++++++++---
2 files changed, 66 insertions(+), 7 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mfd/twl4030-power.txt
diff --git a/Documentation/devicetree/bindings/mfd/twl4030-power.txt
b/Documentation/devicetree/bindings/mfd/twl4030-power.txt
new file mode 100644
index 0000000..8e15ec3
--- /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 8fa6c7b..9f59c94 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,
--
1.7.5.4
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