This patch adds a minimal driver for the Freescale i.MX23, i.MX28
power subsystem. It's required to trigger the probing of the underlying
drivers like on-chip regulators.
Signed-off-by: Stefan Wahren <stefan.wah...@i2se.com>
---
drivers/power/Kconfig | 8 +++
drivers/power/Makefile | 1 +
drivers/power/mxs_power.c | 146 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 155 insertions(+)
create mode 100644 drivers/power/mxs_power.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 4091fb0..b689017 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -43,6 +43,14 @@ config MAX8925_POWER
Say Y here to enable support for the battery charger in the Maxim
MAX8925 PMIC.
+config MXS_POWER
+ tristate "Freescale MXS power subsystem support"
+ depends on ARCH_MXS
+ help
+ Say Y here to enable support for the Freescale i.MX23/i.MX28
+ power subsystem. This is a requirement to get access to on-chip
+ regulators, battery charger and many more.
+
config WM831X_BACKUP
tristate "WM831X backup battery charger support"
depends on MFD_WM831X
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index b7b0181..8edcad7 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
obj-$(CONFIG_PDA_POWER) += pda_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
obj-$(CONFIG_MAX8925_POWER) += max8925_power.o
+obj-$(CONFIG_MXS_POWER) += mxs_power.o
obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o
obj-$(CONFIG_WM831X_POWER) += wm831x_power.o
obj-$(CONFIG_WM8350_POWER) += wm8350_power.o
diff --git a/drivers/power/mxs_power.c b/drivers/power/mxs_power.c
new file mode 100644
index 0000000..f3428d3
--- /dev/null
+++ b/drivers/power/mxs_power.c
@@ -0,0 +1,146 @@
+/*
+ * Freescale MXS power subsystem
+ *
+ * Copyright (C) 2014 Stefan Wahren
+ *
+ * Inspired by imx-bootlets
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/types.h>
+
+#define HW_POWER_CTRL_CLR 0x08
+
+#define BM_POWER_CTRL_POLARITY_VBUSVALID BIT(5)
+#define BM_POWER_CTRL_VBUSVALID_IRQ BIT(4)
+#define BM_POWER_CTRL_ENIRQ_VBUS_VALID BIT(3)
+
+#define HW_POWER_5VCTRL_OFFSET 0x10
+
+#define BM_POWER_5VCTRL_VBUSVALID_THRESH (7 << 8)
+#define BM_POWER_5VCTRL_PWDN_5VBRNOUT BIT(7)
+#define BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT BIT(6)
+#define BM_POWER_5VCTRL_VBUSVALID_5VDETECT BIT(4)
+
+#define HW_POWER_5VCTRL_VBUSVALID_THRESH_4_40V (5 << 8)
+
+struct mxs_power_data {
+ void __iomem *base_addr;
+ struct power_supply *ac;
+};
+
+static enum power_supply_property mxs_power_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int mxs_power_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = 1;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static const struct of_device_id of_mxs_power_match[] = {
+ { .compatible = "fsl,imx23-power" },
+ { .compatible = "fsl,imx28-power" },
+ { /* end */ }
+};
+MODULE_DEVICE_TABLE(of, of_mxs_power_match);
+
+static const struct power_supply_desc ac_desc = {
+ .properties = mxs_power_ac_props,
+ .num_properties = ARRAY_SIZE(mxs_power_ac_props),
+ .get_property = mxs_power_ac_get_property,
+ .name = "ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+};
+
+static int mxs_power_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct resource *res;
+ struct mxs_power_data *data;
+ struct power_supply_config psy_cfg = {};
+ void __iomem *v5ctrl_addr;
+
+ if (!np) {
+ dev_err(dev, "missing device tree\n");
+ return -EINVAL;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ data->base_addr = devm_ioremap_resource(dev, res);
+ if (IS_ERR(data->base_addr))
+ return PTR_ERR(data->base_addr);
+
+ psy_cfg.drv_data = data;
+
+ data->ac = power_supply_register(dev, &ac_desc, &psy_cfg);
+ if (IS_ERR(data->ac))
+ return PTR_ERR(data->ac);
+
+ platform_set_drvdata(pdev, data);
+
+ v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
+
+ /* Make sure the current limit of the linregs are disabled. */
+ writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
+ v5ctrl_addr + HW_POWER_CTRL_CLR);
+
+ return of_platform_populate(np, NULL, NULL, dev);
+}
+
+static int mxs_power_remove(struct platform_device *pdev)
+{
+ struct mxs_power_data *data = platform_get_drvdata(pdev);
+
+ power_supply_unregister(data->ac);
+
+ return 0;
+}
+
+static struct platform_driver mxs_power_driver = {
+ .driver = {
+ .name = "mxs_power",
+ .of_match_table = of_mxs_power_match,
+ },
+ .probe = mxs_power_probe,
+ .remove = mxs_power_remove,
+};
+
+module_platform_driver(mxs_power_driver);
+
+MODULE_AUTHOR("Stefan Wahren <stefan.wah...@i2se.com>");
+MODULE_DESCRIPTION("Freescale MXS power subsystem");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
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