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Date: Thu, 30 May 2013 15:51:55 +0200
From: Florian Vaussard <florian.vaussard@...l.ch>
To: Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Samuel Ortiz <sameo@...ux.intel.com>
Cc: Rob Landley <rob@...dley.net>,
Peter Ujfalusi <peter.ujfalusi@...com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Tero Kristo <t-kristo@...com>,
devicetree-discuss@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Florian Vaussard <florian.vaussard@...l.ch>
Subject: [PATCH 2/3] 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@...l.ch>
---
.../devicetree/bindings/mfd/twl4030-power.txt | 28 +++++++
drivers/mfd/twl4030-power.c | 86 +++++++++++++++----
2 files changed, 96 insertions(+), 18 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 c9a2a5c..d12d748 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>
@@ -492,6 +493,39 @@ int twl4030_remove_script(u8 flags)
return err;
}
+int twl4030_power_configure_scripts(struct twl4030_power_data *pdata)
+{
+ int err;
+ int i;
+ u8 address = twl4030_start_script_address;
+
+ for (i = 0; i < pdata->num; i++) {
+ err = load_twl4030_script(pdata->scripts[i], address);
+ if (err)
+ return err;
+ address += pdata->scripts[i]->size;
+ }
+
+ return 0;
+}
+
+int twl4030_power_configure_resources(struct twl4030_power_data *pdata)
+{
+ struct twl4030_resconfig *resconfig = pdata->resource_config;
+ int err;
+
+ if (resconfig) {
+ while (resconfig->resource) {
+ err = twl4030_configure_resource(resconfig);
+ if (err)
+ return err;
+ resconfig++;
+ }
+ }
+
+ return 0;
+}
+
/*
* In master mode, start the power off sequence.
* After a successful execution, TWL shuts down the power to the SoC
@@ -507,13 +541,29 @@ 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;
- int i;
- struct twl4030_resconfig *resconfig;
- u8 val, address = twl4030_start_script_address;
+ 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);
@@ -525,26 +575,17 @@ int twl4030_power_probe(struct platform_device *pdev)
if (err)
goto unlock;
- for (i = 0; i < pdata->num; i++) {
- err = load_twl4030_script(pdata->scripts[i], address);
+ if (pdata) {
+ err = twl4030_power_configure_scripts(pdata);
if (err)
goto load;
- address += pdata->scripts[i]->size;
- }
-
- resconfig = pdata->resource_config;
- if (resconfig) {
- while (resconfig->resource) {
- err = twl4030_configure_resource(resconfig);
- if (err)
- goto resource;
- resconfig++;
-
- }
+ 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);
@@ -590,10 +631,19 @@ 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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