gpio: slg7xl45106: Add support for slg7xl45106 i2c gpo expander

slg7xl45106 is i2c based 8-bit gpo expander, gpo pins are set and get by
writing and reading corresponding gpo bit value into its data register.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/839f475cc75c97ffb3496a4caa93de2faabdbca2.1645629688.git.michal.simek@xilinx.com

diff --git a/MAINTAINERS b/MAINTAINERS
index 0f39bc6..bb6ea06 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -636,6 +636,7 @@ F:  arch/arm/mach-zynqmp/
 F:     drivers/clk/clk_zynqmp.c
 F:     driver/firmware/firmware-zynqmp.c
 F:     drivers/fpga/zynqpl.c
+F:     drivers/gpio/gpio_slg7xl45106.c
 F:     drivers/gpio/zynq_gpio.c
 F:     drivers/gpio/zynqmp_gpio_modepin.c
 F:     drivers/i2c/i2c-cdns.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 522dfc1..a9e9b30 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -550,4 +550,12 @@ config SL28CPLD_GPIO
        help
          Support GPIO access on Kontron sl28cpld board management controllers.
 
+config SLG7XL45106_I2C_GPO
+       bool "slg7xl45106 i2c gpo expander"
+       depends on DM_GPIO
+       help
+          Support for slg7xl45106 i2c gpo expander. It is an i2c based
+          8-bit gpo expander, all gpo lines are controlled by writing
+          value into data register.
+
 endif

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 33f7d41..b2e78b0 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -72,3 +72,4 @@ obj-$(CONFIG_NOMADIK_GPIO)    += nmk_gpio.o
 obj-$(CONFIG_MAX7320_GPIO)     += max7320_gpio.o
 obj-$(CONFIG_SL28CPLD_GPIO)    += sl28cpld-gpio.o
 obj-$(CONFIG_ZYNQMP_GPIO_MODEPIN)      += zynqmp_gpio_modepin.o
+obj-$(CONFIG_SLG7XL45106_I2C_GPO)      += gpio_slg7xl45106.o

diff --git a/drivers/gpio/gpio_slg7xl45106.c b/drivers/gpio/gpio_slg7xl45106.c
new file mode 100644 (file)
index 0000000..2cbf748
--- /dev/null
+++ b/drivers/gpio/gpio_slg7xl45106.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * slg7xl45106_i2c_gpo driver
+ *
+ * Copyright (C) 2021 Xilinx, Inc.
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/arch/hardware.h>
+
+#define SLG7XL45106_REG                0xdb
+
+static int slg7xl45106_i2c_gpo_direction_input(struct udevice *dev,
+                                              unsigned int offset)
+{
+       return 0;
+}
+
+static int slg7xl45106_i2c_gpo_xlate(struct udevice *dev,
+                                    struct gpio_desc *desc,
+                                    struct ofnode_phandle_args *args)
+{
+       desc->offset = (unsigned int)args->args[0];
+
+       return 0;
+}
+
+static int slg7xl45106_i2c_gpo_set_value(struct udevice *dev,
+                                        unsigned int offset, int value)
+{
+       int ret;
+       u8 val;
+
+       ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1);
+       if (ret)
+               return ret;
+
+       if (value)
+               val |= BIT(offset);
+       else
+               val &= ~BIT(offset);
+
+       return dm_i2c_write(dev, SLG7XL45106_REG, &val, 1);
+}
+
+static int slg7xl45106_i2c_gpo_direction_output(struct udevice *dev,
+                                               unsigned int offset, int value)
+{
+       return slg7xl45106_i2c_gpo_set_value(dev, offset, value);
+}
+
+static int slg7xl45106_i2c_gpo_get_value(struct udevice *dev,
+                                        unsigned int offset)
+{
+       int ret;
+       u8 val;
+
+       ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1);
+       if (ret)
+               return ret;
+
+       return !!(val & BIT(offset));
+}
+
+static int slg7xl45106_i2c_gpo_get_function(struct udevice *dev,
+                                           unsigned int offset)
+{
+       return GPIOF_OUTPUT;
+}
+
+static const struct dm_gpio_ops slg7xl45106_i2c_gpo_ops = {
+       .direction_input = slg7xl45106_i2c_gpo_direction_input,
+       .direction_output = slg7xl45106_i2c_gpo_direction_output,
+       .get_value = slg7xl45106_i2c_gpo_get_value,
+       .set_value = slg7xl45106_i2c_gpo_set_value,
+       .get_function = slg7xl45106_i2c_gpo_get_function,
+       .xlate = slg7xl45106_i2c_gpo_xlate,
+};
+
+static int slg7xl45106_i2c_gpo_probe(struct udevice *dev)
+{
+       struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+       const void *label_ptr;
+
+       label_ptr = dev_read_prop(dev, "label", NULL);
+       if (label_ptr) {
+               uc_priv->bank_name = strdup(label_ptr);
+               if (!uc_priv->bank_name)
+                       return -ENOMEM;
+       } else {
+               uc_priv->bank_name = dev->name;
+       }
+
+       uc_priv->gpio_count = 8;
+
+       return 0;
+}
+
+static const struct udevice_id slg7xl45106_i2c_gpo_ids[] = {
+       { .compatible = "dlg,slg7xl45106",},
+       { }
+};
+
+U_BOOT_DRIVER(slg7xl45106_i2c_gpo) = {
+       .name = "slg7xl45106_i2c_gpo",
+       .id = UCLASS_GPIO,
+       .ops = &slg7xl45106_i2c_gpo_ops,
+       .of_match = slg7xl45106_i2c_gpo_ids,
+       .probe = slg7xl45106_i2c_gpo_probe,
+};