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    Subject[PATCH 03/10] power: reset: Add TWL6030 power driver, with minimal support for power off
    Date
    From: Paul Kocialkowski <contact@paulk.fr>

    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>
    Signed-off-by: Mithil Bavishi <bavishimithil@gmail.com>
    ---
    drivers/power/reset/Kconfig | 10 ++++
    drivers/power/reset/Makefile | 1 +
    drivers/power/reset/twl6030-power.c | 93 +++++++++++++++++++++++++++++
    3 files changed, 104 insertions(+)
    create mode 100644 drivers/power/reset/twl6030-power.c

    diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
    index 39117b697..5156b1613 100644
    --- a/drivers/power/reset/Kconfig
    +++ b/drivers/power/reset/Kconfig
    @@ -316,3 +316,13 @@ config TWL4030_POWER
    and load scripts controlling which resources are switched off/on
    or reset when a sleep, wakeup or warm reset event occurs.
    endif
    +
    +config TWL6030_POWER
    + bool "TI TWL6030 power resources"
    + depends on TWL4030_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.
    diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
    index e9db25b09..692d51cef 100644
    --- a/drivers/power/reset/Makefile
    +++ b/drivers/power/reset/Makefile
    @@ -37,3 +37,4 @@ obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o
    obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o
    obj-$(CONFIG_POWER_MLXBF) += pwr-mlxbf.o
    obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
    +obj-$(CONFIG_TWL6030_POWER) += twl6030-power.o
    diff --git a/drivers/power/reset/twl6030-power.c b/drivers/power/reset/twl6030-power.c
    new file mode 100644
    index 000000000..78c8a02a3
    --- /dev/null
    +++ b/drivers/power/reset/twl6030-power.c
    @@ -0,0 +1,93 @@
    +/*
    + * 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.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/pm.h>
    +#include <linux/mfd/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 BIT(0)
    +#define TWL6030_PHOENIX_CON_DEVOFF BIT(1)
    +#define TWL6030_PHOENIX_MOD_DEVOFF BIT(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(struct device_node *node)
    +{
    + 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)
    +{
    + struct device_node *node = pdev->dev.of_node;
    +
    + if (!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(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");
    --
    2.25.1
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