linux-kernel - [PATCH 8/8] clk: tenstorrent: Add reset controller to Atlantis clock controller probe

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Message-Id: <20260115-atlantis-clocks-v1-8-7356e671f28b@oss.tenstorrent.com>
Date: Thu, 15 Jan 2026 17:42:07 -0600
From: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>
To: Drew Fustini <dfustini@....tenstorrent.com>, 
 Joel Stanley <jms@....tenstorrent.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Anirudh Srinivasan <asrinivasan@....tenstorrent.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, joel@....id.au, 
 fustini@...nel.org, mpe@...nel.org, mpe@....tenstorrent.com, 
 npiggin@....tenstorrent.com, agross@...nel.org, agross@....tenstorrent.com
Subject: [PATCH 8/8] clk: tenstorrent: Add reset controller to Atlantis
 clock controller probe

Create a reset auxiliary device during probe of clock controller

Signed-off-by: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>
---
 drivers/clk/tenstorrent/atlantis-ccu.c | 59 ++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/clk/tenstorrent/atlantis-ccu.c b/drivers/clk/tenstorrent/atlantis-ccu.c
index f3a2ea49a82e..e4f56018907f 100644
--- a/drivers/clk/tenstorrent/atlantis-ccu.c
+++ b/drivers/clk/tenstorrent/atlantis-ccu.c
@@ -491,6 +491,7 @@ struct atlantis_ccu {
 struct atlantis_ccu_data {
 	struct clk_hw **hws;
 	size_t num;
+	const char *reset_name;
 };
 
 static const struct clk_parent_data osc_24m_clk[] = {
@@ -706,6 +707,7 @@ static struct clk_hw *atlantis_rcpu_clks[] = {
 static const struct atlantis_ccu_data atlantis_ccu_rcpu_data = {
 	.hws = atlantis_rcpu_clks,
 	.num = ARRAY_SIZE(atlantis_rcpu_clks),
+	.reset_name = "rcpu-reset"
 };
 
 static int atlantis_ccu_clocks_register(struct device *dev,
@@ -875,6 +877,59 @@ static int atlantis_ccu_clocks_register(struct device *dev,
 	return ret;
 }
 
+static void atlantis_cadev_release(struct device *dev)
+{
+	struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+	kfree(to_atlantis_ccu_adev(adev));
+}
+
+static void atlantis_adev_unregister(void *data)
+{
+	struct auxiliary_device *adev = data;
+
+	auxiliary_device_delete(adev);
+	auxiliary_device_uninit(adev);
+}
+
+static int atlantis_ccu_adev_register(struct device *dev,
+				      struct atlantis_ccu *ccu,
+				      const struct atlantis_ccu_data *data,
+				      const char *adev_name)
+{
+	struct atlantis_ccu_adev *cadev;
+	struct auxiliary_device *adev;
+	int ret;
+
+	cadev = kzalloc(sizeof(*cadev), GFP_KERNEL);
+	if (!cadev)
+		return -ENOMEM;
+
+	cadev->regmap = ccu->regmap;
+
+	adev = &cadev->adev;
+	adev->name = adev_name;
+	adev->dev.parent = dev;
+	adev->dev.release = atlantis_cadev_release;
+	adev->dev.of_node = dev->of_node;
+
+	ret = auxiliary_device_init(adev);
+	if (ret)
+		goto err_free_cadev;
+
+	ret = auxiliary_device_add(adev);
+	if (ret) {
+		auxiliary_device_uninit(adev);
+		return ret;
+	}
+
+	return devm_add_action_or_reset(dev, atlantis_adev_unregister, adev);
+
+err_free_cadev:
+	kfree(cadev);
+
+	return ret;
+}
 static int atlantis_ccu_probe(struct platform_device *pdev)
 {
 	const struct atlantis_ccu_data *data;
@@ -905,6 +960,10 @@ static int atlantis_ccu_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to register clocks\n");
 
+	ret = atlantis_ccu_adev_register(dev, ccu, data, data->reset_name);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register resets\n");
+
 	return 0;
 }
 

-- 
2.43.0