power: Add a GPIO driver for the as3722 PMIC

This pmic includes GPIOs which should have their own driver. Add
a driver to support these.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-on: Beaver, Jetson-TK1
Tested-by: Stephen Warren <swarren@nvidia.com>

diff --git a/drivers/power/pmic/as3722_gpio.c b/drivers/power/pmic/as3722_gpio.c
new file mode 100644 (file)
index 0000000..d0b681c
--- /dev/null
+++ b/drivers/power/pmic/as3722_gpio.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/gpio.h>
+#include <power/as3722.h>
+#include <power/pmic.h>
+
+#define NUM_GPIOS      8
+
+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 = pmic_reg_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_value(struct udevice *dev, unsigned int gpio,
+                                int level)
+{
+       struct udevice *pmic = dev_get_parent(dev);
+       const char *l;
+       u8 value;
+       int err;
+
+       if (gpio >= NUM_GPIOS)
+               return -EINVAL;
+
+       err = pmic_reg_read(pmic, AS3722_GPIO_SIGNAL_OUT);
+       if (err < 0) {
+               error("failed to read GPIO signal out register: %d", err);
+               return err;
+       }
+       value = err;
+
+       if (level == 0) {
+               value &= ~(1 << gpio);
+               l = "low";
+       } else {
+               value |= 1 << gpio;
+               l = "high";
+       }
+
+       err = pmic_reg_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 *dev, unsigned int gpio,
+                                int value)
+{
+       struct udevice *pmic = dev_get_parent(dev);
+       int err;
+
+       if (gpio > 7)
+               return -EINVAL;
+
+       if (value == 0)
+               value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
+       else
+               value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
+
+       err = pmic_reg_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_value(pmic, gpio, value);
+       if (err < 0) {
+               error("failed to set GPIO#%u high: %d", gpio, err);
+               return err;
+       }
+
+       return 0;
+}
+
+static int as3722_gpio_probe(struct udevice *dev)
+{
+       struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+       uc_priv->gpio_count = NUM_GPIOS;
+       uc_priv->bank_name = "as3722_";
+
+       return 0;
+}
+
+static const struct dm_gpio_ops gpio_as3722_ops = {
+       .direction_output       = as3722_gpio_direction_output,
+       .set_value              = as3722_gpio_set_value,
+};
+
+U_BOOT_DRIVER(gpio_as3722) = {
+       .name   = "gpio_as3722",
+       .id     = UCLASS_GPIO,
+       .ops    = &gpio_as3722_ops,
+       .probe  = as3722_gpio_probe,
+};

diff --git a/include/power/as3722.h b/include/power/as3722.h
index 14afa0c81a8c78326890304e6a0849672cc35241..713e79840f983679b0bd9468bab230c13a091caf 100644 (file)
--- a/include/power/as3722.h
+++ b/include/power/as3722.h
@@ -20,6 +20,11 @@
 #define AS3722_ASIC_ID1 0x90
 #define AS3722_ASIC_ID2 0x91
 
+#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)
+
 struct udevice;
 
 int as3722_init(struct udevice **devp);