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path: root/drivers/gpio/gpio-tn48m.c
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Diffstat (limited to 'drivers/gpio/gpio-tn48m.c')
-rw-r--r--drivers/gpio/gpio-tn48m.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tn48m.c b/drivers/gpio/gpio-tn48m.c
new file mode 100644
index 000000000..cd4a80b22
--- /dev/null
+++ b/drivers/gpio/gpio-tn48m.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Delta TN48M CPLD GPIO driver
+ *
+ * Copyright (C) 2021 Sartura Ltd.
+ *
+ * Author: Robert Marko <robert.marko@sartura.hr>
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/regmap.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+enum tn48m_gpio_type {
+ TN48M_GP0 = 1,
+ TN48M_GPI,
+};
+
+struct tn48m_gpio_config {
+ int ngpio;
+ int ngpio_per_reg;
+ enum tn48m_gpio_type type;
+};
+
+static const struct tn48m_gpio_config tn48m_gpo_config = {
+ .ngpio = 4,
+ .ngpio_per_reg = 4,
+ .type = TN48M_GP0,
+};
+
+static const struct tn48m_gpio_config tn48m_gpi_config = {
+ .ngpio = 4,
+ .ngpio_per_reg = 4,
+ .type = TN48M_GPI,
+};
+
+static int tn48m_gpio_probe(struct platform_device *pdev)
+{
+ const struct tn48m_gpio_config *gpio_config;
+ struct gpio_regmap_config config = {};
+ struct regmap *regmap;
+ u32 base;
+ int ret;
+
+ if (!pdev->dev.parent)
+ return -ENODEV;
+
+ gpio_config = device_get_match_data(&pdev->dev);
+ if (!gpio_config)
+ return -ENODEV;
+
+ ret = device_property_read_u32(&pdev->dev, "reg", &base);
+ if (ret)
+ return ret;
+
+ regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!regmap)
+ return -ENODEV;
+
+ config.regmap = regmap;
+ config.parent = &pdev->dev;
+ config.ngpio = gpio_config->ngpio;
+ config.ngpio_per_reg = gpio_config->ngpio_per_reg;
+ switch (gpio_config->type) {
+ case TN48M_GP0:
+ config.reg_set_base = base;
+ break;
+ case TN48M_GPI:
+ config.reg_dat_base = base;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
+}
+
+static const struct of_device_id tn48m_gpio_of_match[] = {
+ { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },
+ { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
+
+static struct platform_driver tn48m_gpio_driver = {
+ .driver = {
+ .name = "delta-tn48m-gpio",
+ .of_match_table = tn48m_gpio_of_match,
+ },
+ .probe = tn48m_gpio_probe,
+};
+module_platform_driver(tn48m_gpio_driver);
+
+MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
+MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
+MODULE_LICENSE("GPL");