Since the chip can power off the system, add the corresponding functionality. Based on https://github.com/kobolabs/Kobo-Reader/raw/master/hw/imx6sll-clara2e/kernel.tar.bz2 No information source about the magic numbers found. Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx> --- drivers/mfd/rohm-bd71828.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/rohm-bd71828.c b/drivers/mfd/rohm-bd71828.c index 594718f7e8e1..8fd994664bbf 100644 --- a/drivers/mfd/rohm-bd71828.c +++ b/drivers/mfd/rohm-bd71828.c @@ -464,6 +464,21 @@ static int set_clk_mode(struct device *dev, struct regmap *regmap, OUT32K_MODE_CMOS); } +static struct i2c_client *bd71828_dev; +static void bd71828_power_off(void) +{ + while (true) { + /* We are not allowed to sleep, so do not use regmap involving mutexes here. */ + i2c_smbus_write_byte_data(bd71828_dev, BD71828_REG_PS_CTRL_1, 0x02); + mdelay(500); + } +} + +static void bd71828_remove_poweroff(void *data) +{ + pm_power_off = NULL; +} + static int bd71828_i2c_probe(struct i2c_client *i2c) { struct regmap_irq_chip_data *irq_data; @@ -542,7 +557,20 @@ static int bd71828_i2c_probe(struct i2c_client *i2c) ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, mfd, cells, NULL, 0, regmap_irq_get_domain(irq_data)); if (ret) - dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n"); + return dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n"); + + if (of_device_is_system_power_controller(i2c->dev.of_node) && + chip_type == ROHM_CHIP_TYPE_BD71828) { + if (!pm_power_off) { + bd71828_dev = i2c; + pm_power_off = bd71828_power_off; + ret = devm_add_action_or_reset(&i2c->dev, + bd71828_remove_poweroff, + NULL); + } else { + dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); + } + } return ret; } -- 2.39.2
