power: Add AMS AS3722 PMIC support

The AS3722 provides a number of DC/DC converters and LDOs as well as 8
GPIOs.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 04bd996..2145652 100644 (file)
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -5,6 +5,7 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
+obj-$(CONFIG_AS3722_POWER)     += as3722.o
 obj-$(CONFIG_AXP152_POWER)     += axp152.o
 obj-$(CONFIG_AXP209_POWER)     += axp209.o
 obj-$(CONFIG_AXP221_POWER)     += axp221.o

diff --git a/drivers/power/as3722.c b/drivers/power/as3722.c
new file mode 100644 (file)
index 0000000..4c6de79
--- /dev/null
+++ b/drivers/power/as3722.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#define pr_fmt(fmt) "as3722: " fmt
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <i2c.h>
+
+#include <power/as3722.h>
+
+#define AS3722_SD_VOLTAGE(n) (0x00 + (n))
+#define AS3722_GPIO_CONTROL(n) (0x08 + (n))
+#define  AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH (1 << 0)
+#define  AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL (7 << 0)
+#define  AS3722_GPIO_CONTROL_INVERT (1 << 7)
+#define AS3722_LDO_VOLTAGE(n) (0x10 + (n))
+#define AS3722_GPIO_SIGNAL_OUT 0x20
+#define AS3722_SD_CONTROL 0x4d
+#define AS3722_LDO_CONTROL 0x4e
+#define AS3722_ASIC_ID1 0x90
+#define  AS3722_DEVICE_ID 0x0c
+#define AS3722_ASIC_ID2 0x91
+
+static int as3722_read(struct udevice *pmic, u8 reg, u8 *value)
+{
+       int err;
+
+       err = i2c_read(pmic, reg, value, 1);
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+
+static int as3722_write(struct udevice *pmic, u8 reg, u8 value)
+{
+       int err;
+
+       err = i2c_write(pmic, reg, &value, 1);
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+
+static int as3722_read_id(struct udevice *pmic, u8 *id, u8 *revision)
+{
+       int err;
+
+       err = as3722_read(pmic, AS3722_ASIC_ID1, id);
+       if (err) {
+               error("failed to read ID1 register: %d", err);
+               return err;
+       }
+
+       err = as3722_read(pmic, AS3722_ASIC_ID2, revision);
+       if (err) {
+               error("failed to read ID2 register: %d", err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_sd_enable(struct udevice *pmic, unsigned int sd)
+{
+       u8 value;
+       int err;
+
+       if (sd > 6)
+               return -EINVAL;
+
+       err = as3722_read(pmic, AS3722_SD_CONTROL, &value);
+       if (err) {
+               error("failed to read SD control register: %d", err);
+               return err;
+       }
+
+       value |= 1 << sd;
+
+       err = as3722_write(pmic, AS3722_SD_CONTROL, value);
+       if (err < 0) {
+               error("failed to write SD control register: %d", err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_sd_set_voltage(struct udevice *pmic, unsigned int sd, u8 value)
+{
+       int err;
+
+       if (sd > 6)
+               return -EINVAL;
+
+       err = as3722_write(pmic, AS3722_SD_VOLTAGE(sd), value);
+       if (err < 0) {
+               error("failed to write SD%u voltage register: %d", sd, err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_ldo_enable(struct udevice *pmic, unsigned int ldo)
+{
+       u8 value;
+       int err;
+
+       if (ldo > 11)
+               return -EINVAL;
+
+       err = as3722_read(pmic, AS3722_LDO_CONTROL, &value);
+       if (err) {
+               error("failed to read LDO control register: %d", err);
+               return err;
+       }
+
+       value |= 1 << ldo;
+
+       err = as3722_write(pmic, AS3722_LDO_CONTROL, value);
+       if (err < 0) {
+               error("failed to write LDO control register: %d", err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_ldo_set_voltage(struct udevice *pmic, unsigned int ldo, u8 value)
+{
+       int err;
+
+       if (ldo > 11)
+               return -EINVAL;
+
+       err = as3722_write(pmic, AS3722_LDO_VOLTAGE(ldo), value);
+       if (err < 0) {
+               error("failed to write LDO%u voltage register: %d", ldo,
+                     err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
+                         unsigned long flags)
+{
+       u8 value = 0;
+       int err;
+
+       if (flags & AS3722_GPIO_OUTPUT_VDDH)
+               value |= AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
+
+       if (flags & AS3722_GPIO_INVERT)
+               value |= AS3722_GPIO_CONTROL_INVERT;
+
+       err = as3722_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
+       if (err) {
+               error("failed to configure GPIO#%u: %d", gpio, err);
+               return err;
+       }
+
+       return 0;
+}
+
+static int as3722_gpio_set(struct udevice *pmic, unsigned int gpio,
+                          unsigned int level)
+{
+       const char *l;
+       u8 value;
+       int err;
+
+       if (gpio > 7)
+               return -EINVAL;
+
+       err = as3722_read(pmic, AS3722_GPIO_SIGNAL_OUT, &value);
+       if (err < 0) {
+               error("failed to read GPIO signal out register: %d", err);
+               return err;
+       }
+
+       if (level == 0) {
+               value &= ~(1 << gpio);
+               l = "low";
+       } else {
+               value |= 1 << gpio;
+               l = "high";
+       }
+
+       err = as3722_write(pmic, AS3722_GPIO_SIGNAL_OUT, value);
+       if (err) {
+               error("failed to set GPIO#%u %s: %d", gpio, l, err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_gpio_direction_output(struct udevice *pmic, unsigned int gpio,
+                                unsigned int level)
+{
+       u8 value;
+       int err;
+
+       if (gpio > 7)
+               return -EINVAL;
+
+       if (level == 0)
+               value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
+       else
+               value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
+
+       err = as3722_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
+       if (err) {
+               error("failed to configure GPIO#%u as output: %d", gpio, err);
+               return err;
+       }
+
+       err = as3722_gpio_set(pmic, gpio, level);
+       if (err < 0) {
+               error("failed to set GPIO#%u high: %d", gpio, err);
+               return err;
+       }
+
+       return 0;
+}
+
+int as3722_init(struct udevice **devp)
+{
+       struct udevice *pmic;
+       u8 id, revision;
+       const unsigned int bus = 0;
+       const unsigned int address = 0x40;
+       int err;
+
+       err = i2c_get_chip_for_busnum(bus, address, &pmic);
+       if (err)
+               return err;
+       err = as3722_read_id(pmic, &id, &revision);
+       if (err < 0) {
+               error("failed to read ID: %d", err);
+               return err;
+       }
+
+       if (id != AS3722_DEVICE_ID) {
+               error("unknown device");
+               return -ENOENT;
+       }
+
+       debug("AS3722 revision %#x found on I2C bus %u, address %#x\n",
+             revision, bus, address);
+       *devp = pmic;
+
+       return 0;
+}

diff --git a/include/fdtdec.h b/include/fdtdec.h
index d2b665c..cc2dc5c 100644 (file)
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -123,6 +123,7 @@ enum fdt_compat_id {
        COMPAT_INTEL_PANTHERPOINT_AHCI, /* Intel Pantherpoint AHCI */
        COMPAT_INTEL_MODEL_206AX,       /* Intel Model 206AX CPU */
        COMPAT_INTEL_GMA,               /* Intel Graphics Media Accelerator */
+       COMPAT_AMS_AS3722,              /* AMS AS3722 PMIC */
 
        COMPAT_COUNT,
 };

diff --git a/include/power/as3722.h b/include/power/as3722.h
new file mode 100644 (file)
index 0000000..aa966d2
--- /dev/null
+++ b/include/power/as3722.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __POWER_AS3722_H__
+#define __POWER_AS3722_H__
+
+#include <asm/types.h>
+
+#define AS3722_GPIO_OUTPUT_VDDH (1 << 0)
+#define AS3722_GPIO_INVERT (1 << 1)
+
+struct udevice;
+
+int as3722_init(struct udevice **devp);
+int as3722_sd_enable(struct udevice *pmic, unsigned int sd);
+int as3722_sd_set_voltage(struct udevice *pmic, unsigned int sd, u8 value);
+int as3722_ldo_enable(struct udevice *pmic, unsigned int ldo);
+int as3722_ldo_set_voltage(struct udevice *pmic, unsigned int ldo, u8 value);
+int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
+                         unsigned long flags);
+int as3722_gpio_direction_output(struct udevice *pmic, unsigned int gpio,
+                                unsigned int level);
+
+#endif /* __POWER_AS3722_H__ */

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 9d86dba..9a4d470 100644 (file)
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -78,6 +78,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
        COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"),
        COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
        COMPAT(INTEL_GMA, "intel,gma"),
+       COMPAT(AMS_AS3722, "ams,as3722"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)