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167 lines
4.5 KiB
Diff
167 lines
4.5 KiB
Diff
--- a/drivers/power/Kconfig
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+++ b/drivers/power/Kconfig
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@@ -43,6 +43,14 @@ config MAX8925_POWER
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Say Y here to enable support for the battery charger in the Maxim
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MAX8925 PMIC.
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+config MXS_POWER
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+ tristate "Freescale MXS power subsystem support"
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+ depends on ARCH_MXS || COMPILE_TEST
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+ help
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+ Say Y here to enable support for the Freescale i.MX23/i.MX28
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+ power subsystem. This is a requirement to get access to on-chip
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+ regulators, battery charger and many more.
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+
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config WM831X_BACKUP
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tristate "WM831X backup battery charger support"
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depends on MFD_WM831X
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--- a/drivers/power/Makefile
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+++ b/drivers/power/Makefile
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@@ -11,6 +11,7 @@ obj-$(CONFIG_PDA_POWER) += pda_power.o
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obj-$(CONFIG_APM_POWER) += apm_power.o
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obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o
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obj-$(CONFIG_MAX8925_POWER) += max8925_power.o
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+obj-$(CONFIG_MXS_POWER) += mxs_power.o
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obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o
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obj-$(CONFIG_WM831X_POWER) += wm831x_power.o
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obj-$(CONFIG_WM8350_POWER) += wm8350_power.o
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--- /dev/null
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+++ b/drivers/power/mxs_power.c
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@@ -0,0 +1,136 @@
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+/*
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+ * Freescale MXS power subsystem
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+ *
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+ * Copyright (C) 2014 Stefan Wahren
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+ *
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+ * Inspired by imx-bootlets
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+ */
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+
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+/*
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+ * The code contained herein is licensed under the GNU General Public
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+ * License. You may obtain a copy of the GNU General Public License
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+ * Version 2 or later at the following locations:
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+ *
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+ * http://www.opensource.org/licenses/gpl-license.html
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+ * http://www.gnu.org/copyleft/gpl.html
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_platform.h>
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+#include <linux/platform_device.h>
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+#include <linux/power_supply.h>
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+#include <linux/stmp_device.h>
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+#include <linux/types.h>
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+
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+#define BM_POWER_CTRL_POLARITY_VBUSVALID BIT(5)
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+#define BM_POWER_CTRL_VBUSVALID_IRQ BIT(4)
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+#define BM_POWER_CTRL_ENIRQ_VBUS_VALID BIT(3)
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+
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+#define HW_POWER_5VCTRL_OFFSET 0x10
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+
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+#define BM_POWER_5VCTRL_VBUSVALID_THRESH (7 << 8)
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+#define BM_POWER_5VCTRL_PWDN_5VBRNOUT BIT(7)
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+#define BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT BIT(6)
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+#define BM_POWER_5VCTRL_VBUSVALID_5VDETECT BIT(4)
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+
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+#define HW_POWER_5VCTRL_VBUSVALID_THRESH_4_40V (5 << 8)
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+
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+struct mxs_power_data {
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+ void __iomem *base_addr;
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+ struct power_supply *ac;
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+};
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+
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+static enum power_supply_property mxs_power_ac_props[] = {
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+ POWER_SUPPLY_PROP_ONLINE,
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+};
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+
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+static int mxs_power_ac_get_property(struct power_supply *psy,
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+ enum power_supply_property psp,
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+ union power_supply_propval *val)
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+{
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+ int ret = 0;
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+
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+ switch (psp) {
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+ case POWER_SUPPLY_PROP_ONLINE:
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+ val->intval = 1;
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+ break;
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+ default:
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+ ret = -EINVAL;
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+ break;
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+ }
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+ return ret;
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+}
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+
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+static const struct of_device_id of_mxs_power_match[] = {
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+ { .compatible = "fsl,imx23-power" },
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+ { .compatible = "fsl,imx28-power" },
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+ { /* end */ }
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+};
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+MODULE_DEVICE_TABLE(of, of_mxs_power_match);
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+
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+static const struct power_supply_desc ac_desc = {
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+ .properties = mxs_power_ac_props,
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+ .num_properties = ARRAY_SIZE(mxs_power_ac_props),
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+ .get_property = mxs_power_ac_get_property,
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+ .name = "ac",
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+ .type = POWER_SUPPLY_TYPE_MAINS,
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+};
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+
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+static int mxs_power_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct device_node *np = dev->of_node;
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+ struct resource *res;
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+ struct mxs_power_data *data;
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+ struct power_supply_config psy_cfg = {};
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+ void __iomem *v5ctrl_addr;
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+
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+ if (!np) {
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+ dev_err(dev, "missing device tree\n");
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+ return -EINVAL;
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+ }
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+
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+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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+ if (!data)
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+ return -ENOMEM;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ data->base_addr = devm_ioremap_resource(dev, res);
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+ if (IS_ERR(data->base_addr))
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+ return PTR_ERR(data->base_addr);
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+
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+ psy_cfg.drv_data = data;
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+
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+ data->ac = devm_power_supply_register(dev, &ac_desc, &psy_cfg);
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+ if (IS_ERR(data->ac))
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+ return PTR_ERR(data->ac);
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+
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+ platform_set_drvdata(pdev, data);
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+
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+ v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
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+
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+ /* Make sure the current limit of the linregs are disabled. */
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+ writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
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+ v5ctrl_addr + STMP_OFFSET_REG_CLR);
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+
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+ return of_platform_populate(np, NULL, NULL, dev);
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+}
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+
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+static struct platform_driver mxs_power_driver = {
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+ .driver = {
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+ .name = "mxs_power",
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+ .of_match_table = of_mxs_power_match,
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+ },
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+ .probe = mxs_power_probe,
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+};
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+
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+module_platform_driver(mxs_power_driver);
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+
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+MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
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+MODULE_DESCRIPTION("Freescale MXS power subsystem");
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+MODULE_LICENSE("GPL v2");
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