Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757929AbcC2TX2 (ORCPT ); Tue, 29 Mar 2016 15:23:28 -0400 Received: from gagarine.paulk.fr ([109.190.93.129]:54044 "EHLO gagarine.paulk.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757800AbcC2TXY (ORCPT ); Tue, 29 Mar 2016 15:23:24 -0400 From: Paul Kocialkowski To: linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org Cc: Rob Herring , Tony Lindgren , Dmitry Torokhov , Sebastian Reichel , Dmitry Eremin-Solenikov , David Woodhouse , Paul Kocialkowski Subject: [PATCH 4/8] mfd: Add TWL6030 power driver, with minimal support for power off Date: Tue, 29 Mar 2016 21:22:17 +0200 Message-Id: <1459279341-17389-4-git-send-email-contact@paulk.fr> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1459279341-17389-1-git-send-email-contact@paulk.fr> References: <1459279341-17389-1-git-send-email-contact@paulk.fr> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6622 Lines: 221 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 --- .../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 + * + * 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 +#include +#include +#include +#include +#include + +#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 "); +MODULE_DESCRIPTION("Power management for TWL6030"); +MODULE_LICENSE("GPL"); -- 2.7.4