From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Zhang Subject: [PATCH v2 3/4] mfd: max77620: Add low battery monitor support Date: Tue, 29 Jan 2019 16:55:30 +0800 Message-ID: <20190129085531.32364-4-markz@nvidia.com> References: <20190129085531.32364-1-markz@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20190129085531.32364-1-markz@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: lee.jones@linaro.org, blaws05@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-tegra@vger.kernel.org, Mark Zhang , Laxman Dewangan , Venkat Reddy Talla List-Id: devicetree@vger.kernel.org This patch adds PMIC configurations for low-battery monitoring by handling max77620 register CNFGGLBL1. Signed-off-by: Laxman Dewangan Signed-off-by: Venkat Reddy Talla Signed-off-by: Mark Zhang --- drivers/mfd/max77620.c | 57 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c index f58143103185..9e50d145afd8 100644 --- a/drivers/mfd/max77620.c +++ b/drivers/mfd/max77620.c @@ -474,6 +474,57 @@ static int max77620_init_backup_battery_charging(struc= t max77620_chip *chip) return ret; } =20 +static int max77620_init_low_battery_monitor(struct max77620_chip *chip) +{ + struct device *dev =3D chip->dev; + struct device_node *np; + bool pval; + u8 mask =3D 0; + u8 val =3D 0; + int ret; + + np =3D of_get_child_by_name(dev->of_node, "low-battery-monitor"); + if (!np) { + dev_info(dev, "Low battery monitoring support disabled\n"); + return 0; + } + + pval =3D of_property_read_bool(np, "maxim,low-battery-dac-enable"); + if (pval) { + mask |=3D MAX77620_CNFGGLBL1_LBDAC_EN; + val |=3D MAX77620_CNFGGLBL1_LBDAC_EN; + } + + pval =3D of_property_read_bool(np, "maxim,low-battery-dac-disable"); + if (pval) + mask |=3D MAX77620_CNFGGLBL1_LBDAC_EN; + + pval =3D of_property_read_bool(np, "maxim,low-battery-shutdown-enable"); + if (pval) { + mask |=3D MAX77620_CNFGGLBL1_MPPLD; + val |=3D MAX77620_CNFGGLBL1_MPPLD; + } + + pval =3D of_property_read_bool(np, "maxim,low-battery-shutdown-disable"); + if (pval) + mask |=3D MAX77620_CNFGGLBL1_MPPLD; + + pval =3D of_property_read_bool(np, "maxim,low-battery-reset-enable"); + if (pval) { + mask |=3D MAX77620_CNFGGLBL1_LBRSTEN; + val |=3D MAX77620_CNFGGLBL1_LBRSTEN; + } + + pval =3D of_property_read_bool(np, "maxim,low-battery-reset-disable"); + if (pval) + mask |=3D MAX77620_CNFGGLBL1_LBRSTEN; + + ret =3D regmap_update_bits(chip->rmap, MAX77620_REG_CNFGGLBL1, mask, val)= ; + if (ret < 0) + dev_err(dev, "Reg CNFGGLBL1 update failed: %d\n", ret); + return ret; +} + static int max77620_read_es_version(struct max77620_chip *chip) { unsigned int val; @@ -563,7 +614,11 @@ static int max77620_probe(struct i2c_client *client, if (ret < 0) return ret; =20 - ret =3D devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, + ret =3D max77620_init_low_battery_monitor(chip); + if (ret < 0) + return ret; + + ret =3D devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, mfd_cells, n_mfd_cells, NULL, 0, regmap_irq_get_domain(chip->top_irq_data)); if (ret < 0) { --=20 2.19.2