+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Audio reset driver for the StarFive JH7100 SoC
+ *
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/reset/starfive-jh7100-audio.h>
+
+#include "reset-starfive-jh7100.h"
+
+/* register offsets */
+#define JH7100_AUDRST_ASSERT0 0x00
+#define JH7100_AUDRST_STATUS0 0x04
+
+/*
+ * Writing a 1 to the n'th bit of the ASSERT register asserts
+ * line n, and writing a 0 deasserts the same line.
+ * Most reset lines have their status inverted so a 0 bit in the STATUS
+ * register means the line is asserted and a 1 means it's deasserted. A few
+ * lines don't though, so store the expected value of the status registers when
+ * all lines are asserted.
+ */
+static const u32 jh7100_audrst_asserted[1] = {
+ BIT(JH7100_AUDRST_USB_AXI) |
+ BIT(JH7100_AUDRST_USB_PWRUP_RST_N) |
+ BIT(JH7100_AUDRST_USB_PONRST)
+};
+
+static int jh7100_audrst_probe(struct platform_device *pdev)
+{
+ return reset_starfive_jh7100_generic_probe(pdev, jh7100_audrst_asserted,
+ JH7100_AUDRST_STATUS0, JH7100_AUDRSTN_END);
+}
+
+static const struct of_device_id jh7100_audrst_dt_ids[] = {
+ { .compatible = "starfive,jh7100-audrst" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh7100_audrst_dt_ids);
+
+static struct platform_driver jh7100_audrst_driver = {
+ .probe = jh7100_audrst_probe,
+ .driver = {
+ .name = "jh7100-reset-audio",
+ .of_match_table = jh7100_audrst_dt_ids,
+ },
+};
+module_platform_driver(jh7100_audrst_driver);
+
+MODULE_AUTHOR("Emil Renner Berthing");
+MODULE_DESCRIPTION("StarFive JH7100 audio reset driver");
+MODULE_LICENSE("GPL");