[PATCH 4/8] mfd: Add TWL6030 power driver, with minimal support for power off

Paul Kocialkowski
2016-03-29T19:23:28Z

This adds a TWL6030 power driver, that currently only supports powering off the
device when the TWL is used as system power controller.

This driver might be extended to support more power-related features of the
TWL6030.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
---
.../devicetree/bindings/mfd/twl6030-power.txt | 31 +++++++
drivers/mfd/Kconfig | 10 ++
drivers/mfd/Makefile | 5 +-
drivers/mfd/twl-core.c | 8 ++
drivers/mfd/twl6030-power.c | 102 +++++++++++++++++++++
5 files changed, 154 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mfd/twl6030-power.txt
create mode 100644 drivers/mfd/twl6030-power.c

diff --git a/Documentation/devicetree/bindings/mfd/twl6030-power.txt b/Documentation/devicetree/bindings/mfd/twl6030-power.txt
new file mode 100644
index 0000000..97600e7
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/twl6030-power.txt
@@ -0,0 +1,31 @@
+Texas Instruments TWL family (twl6030) reset and power management module
+
+For now, the binding only supports the complete shutdown of the system after
+poweroff.
+
+Required properties:
+- compatible : must be
+ "ti,twl6030-power"
+
+Optional properties:
+
+- ti,system-power-controller: This indicates that TWL6030 is the
+ power supply master of the system. With this flag, the chip will
+ initiate 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,twl6030-power";
+ ti,system-power-controller;
+ };
+ };
+};
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 28bfe3d..a0a8012 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1301,6 +1301,16 @@ config MFD_TWL4030_AUDIO
select MFD_CORE
default n

+config TWL6030_POWER
+ bool "TI TWL6030 power resources"
+ depends on TWL_CORE && ARM
+ help
+ Say yes here if you want to use the power resources on the
+ TWL6030 family chips.
+
+ When used as system power controller, this driver allows turning off
+ the main power supply.
+
config TWL6040_CORE
bool "TI TWL6040 audio codec"
depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 7daeab5..5aa16c8 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -81,9 +81,10 @@ obj-$(CONFIG_MFD_TPS65912_SPI) += tps65912-spi.o
obj-$(CONFIG_MFD_TPS80031) += tps80031.o
obj-$(CONFIG_MENELAUS) += menelaus.o

-obj-$(CONFIG_TWL_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
-obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
+obj-$(CONFIG_TWL_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
+obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
obj-$(CONFIG_MFD_TWL4030_AUDIO) += twl4030-audio.o
+obj-$(CONFIG_TWL6030_POWER) += twl6030-power.o
obj-$(CONFIG_TWL6040_CORE) += twl6040.o

obj-$(CONFIG_MFD_MX25_TSADC) += fsl-imx25-tsadc.o
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index dae52f7..74372bc 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -972,6 +972,14 @@ add_children(struct twl_platform_data *pdata, unsigned irq_base,
return PTR_ERR(child);
}

+ if (IS_ENABLED(CONFIG_TWL6030_POWER) && pdata->power) {
+ child = add_child(TWL_MODULE_PM_MASTER, "twl6030_power",
+ pdata->power, sizeof(*pdata->power), false,
+ 0, 0);
+ if (IS_ERR(child))
+ return PTR_ERR(child);
+ }
+
return 0;
}

diff --git a/drivers/mfd/twl6030-power.c b/drivers/mfd/twl6030-power.c
new file mode 100644
index 0000000..a0bb6d8
--- /dev/null
+++ b/drivers/mfd/twl6030-power.c
@@ -0,0 +1,102 @@
+/*
+ * TWL6030 power
+ *
+ * Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/i2c/twl.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#define TWL6030_PHOENIX_DEV_ON 0x25
+
+#define TWL6030_PHOENIX_APP_DEVOFF (1 << 0)
+#define TWL6030_PHOENIX_CON_DEVOFF (1 << 1)
+#define TWL6030_PHOENIX_MOD_DEVOFF (1 << 2)
+
+void twl6030_power_off(void)
+{
+ int err;
+
+ err = twl_i2c_write_u8(TWL6030_MODULE_ID0, TWL6030_PHOENIX_APP_DEVOFF |
+ TWL6030_PHOENIX_CON_DEVOFF | TWL6030_PHOENIX_MOD_DEVOFF,
+ TWL6030_PHOENIX_DEV_ON);
+ if (err)
+ pr_err("TWL6030 Unable to power off\n");
+}
+
+static bool twl6030_power_use_poweroff(const struct twl_power_data *pdata,
+ struct device_node *node)
+{
+ if (pdata && pdata->use_poweroff)
+ return true;
+
+ if (of_property_read_bool(node, "ti,system-power-controller"))
+ return true;
+
+ return false;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id twl6030_power_of_match[] = {
+ {
+ .compatible = "ti,twl6030-power",
+ },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, twl6030_power_of_match);
+#endif /* CONFIG_OF */
+
+static int twl6030_power_probe(struct platform_device *pdev)
+{
+ const struct twl_power_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device_node *node = pdev->dev.of_node;
+
+ if (!pdata && !node) {
+ dev_err(&pdev->dev, "Platform data is missing\n");
+ return -EINVAL;
+ }
+
+ /* Board has to be wired properly to use this feature */
+ if (twl6030_power_use_poweroff(pdata, node) && !pm_power_off)
+ pm_power_off = twl6030_power_off;
+
+ return 0;
+}
+
+static int twl6030_power_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver twl6030_power_driver = {
+ .driver = {
+ .name = "twl6030_power",
+ .of_match_table = of_match_ptr(twl6030_power_of_match),
+ },
+ .probe = twl6030_power_probe,
+ .remove = twl6030_power_remove,
+};
+
+module_platform_driver(twl6030_power_driver);
+
+MODULE_AUTHOR("Paul Kocialkowski <contact@paulk.fr>");
+MODULE_DESCRIPTION("Power management for TWL6030");
+MODULE_LICENSE("GPL");
--
2.7.4