[RFC PATCH 7/9] reset: amlogic: add auxiliary reset driver support

[Jerome Brunet <jbrunet@baylibre.com>]

Add support for the reset controller present in the audio clock
controller of the g12 and sm1 SoC families, using the auxiliary bus.

This is expected to replace the driver currently present directly
within the related clock driver.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 drivers/reset/Kconfig                         |  1 +
 drivers/reset/reset-meson.c                   | 46 ++++++++++++++++++-
 include/soc/amlogic/meson8b-auxiliary-reset.h | 17 +++++++
 3 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 include/soc/amlogic/meson8b-auxiliary-reset.h

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 85b27c42cf65..4ceb4dc48fbc 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -134,6 +134,7 @@ config RESET_MCHP_SPARX5
 config RESET_MESON
 	tristate "Meson Reset Driver"
 	depends on ARCH_MESON || COMPILE_TEST
+	depends on AUXILIARY_BUS
 	default ARCH_MESON
 	help
 	  This enables the reset driver for Amlogic Meson SoCs.
diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index e34a10b15593..b5ddb85296ec 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2016 BayLibre, SAS.
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  */
+#include <linux/auxiliary_bus.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -16,6 +17,8 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 
+#include <soc/amlogic/meson8b-auxiliary-reset.h>
+
 struct meson_reset_param {
 	const struct reset_control_ops *reset_ops;
 	unsigned int reset_num;
@@ -218,6 +221,47 @@ static struct platform_driver meson_reset_pltf_driver = {
 };
 module_platform_driver(meson_reset_pltf_driver);
 
-MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
+static const struct meson_reset_param meson_g12a_audio_param = {
+	.reset_ops	= &meson_reset_toggle_ops,
+	.reset_num	= 26,
+	.level_offset	= 0x24,
+};
+
+static const struct meson_reset_param meson_sm1_audio_param = {
+	.reset_ops	= &meson_reset_toggle_ops,
+	.reset_num	= 39,
+	.level_offset	= 0x28,
+};
+
+static const struct auxiliary_device_id meson_reset_aux_ids[] = {
+	{
+		.name = "axg-audio-clkc.rst-g12a",
+		.driver_data = (kernel_ulong_t)&meson_g12a_audio_param,
+	}, {
+		.name = "axg-audio-clkc.rst-sm1",
+		.driver_data = (kernel_ulong_t)&meson_sm1_audio_param,
+	},
+};
+MODULE_DEVICE_TABLE(auxiliary, meson_reset_aux_ids);
+
+static int meson_reset_aux_probe(struct auxiliary_device *adev,
+				 const struct auxiliary_device_id *id)
+{
+	const struct meson_reset_param *param =
+		(const struct meson_reset_param *)(id->driver_data);
+	struct meson8b_reset_adev *raux =
+		to_meson8b_reset_adev(adev);
+
+	return meson_reset_probe(&adev->dev, raux->map, param);
+}
+
+static struct auxiliary_driver meson_reset_aux_driver = {
+	.probe		= meson_reset_aux_probe,
+	.id_table	= meson_reset_aux_ids,
+};
+module_auxiliary_driver(meson_reset_aux_driver);
+
+MODULE_DESCRIPTION("Amlogic Meson Reset driver");
 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 MODULE_LICENSE("Dual BSD/GPL");
diff --git a/include/soc/amlogic/meson8b-auxiliary-reset.h b/include/soc/amlogic/meson8b-auxiliary-reset.h
new file mode 100644
index 000000000000..0a465deb4440
--- /dev/null
+++ b/include/soc/amlogic/meson8b-auxiliary-reset.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SOC_AMLOGIC_MESON8B_AUX_RESET_H
+#define __SOC_AMLOGIC_MESON8B_AUX_RESET_H
+
+#include <linux/auxiliary_bus.h>
+#include <linux/container_of.h>
+#include <linux/regmap.h>
+
+struct meson8b_reset_adev {
+	struct auxiliary_device adev;
+	struct regmap *map;
+};
+
+#define to_meson8b_reset_adev(_adev) \
+	container_of((_adev), struct meson8b_reset_adev, adev)
+
+#endif /* __SOC_AMLOGIC_MESON8B_AUX_RESET_H */
-- 
2.43.0


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