linux-kernel - [PATCH 2/2] pmdomain: thead: create auxiliary device for rebooting

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Message-ID: <20250818074906.2907277-3-uwu@icenowy.me>
Date: Mon, 18 Aug 2025 15:49:06 +0800
From: Icenowy Zheng <uwu@...nowy.me>
To: Drew Fustini <fustini@...nel.org>,
	Guo Ren <guoren@...nel.org>,
	Fu Wei <wefu@...hat.com>,
	Michal Wilczynski <m.wilczynski@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Sebastian Reichel <sre@...nel.org>
Cc: Han Gao <rabenda.cn@...il.com>,
	Yao Zi <ziyao@...root.org>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-pm@...r.kernel.org,
	Icenowy Zheng <uwu@...nowy.me>
Subject: [PATCH 2/2] pmdomain: thead: create auxiliary device for rebooting

The reboot / power off operations require communication with the AON
firmware too.

As the driver is already present, create an auxiliary device with name
"reboot" to match that driver, and pass the AON channel by using
platform_data.

Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
---
 drivers/pmdomain/thead/th1520-pm-domains.c | 35 ++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/pmdomain/thead/th1520-pm-domains.c b/drivers/pmdomain/thead/th1520-pm-domains.c
index 9040b698e7f7f..8285f552897b0 100644
--- a/drivers/pmdomain/thead/th1520-pm-domains.c
+++ b/drivers/pmdomain/thead/th1520-pm-domains.c
@@ -129,12 +129,39 @@ static void th1520_pd_init_all_off(struct generic_pm_domain **domains,
 	}
 }
 
-static void th1520_pd_pwrseq_unregister_adev(void *adev)
+static void th1520_pd_unregister_adev(void *adev)
 {
 	auxiliary_device_delete(adev);
 	auxiliary_device_uninit(adev);
 }
 
+static int th1520_pd_reboot_init(struct device *dev, struct th1520_aon_chan *aon_chan)
+{
+	struct auxiliary_device *adev;
+	int ret;
+
+	adev = devm_kzalloc(dev, sizeof(*adev), GFP_KERNEL);
+	if (!adev)
+		return -ENOMEM;
+
+	adev->name = "reboot";
+	adev->dev.parent = dev;
+	adev->dev.platform_data = aon_chan;
+
+	ret = auxiliary_device_init(adev);
+	if (ret)
+		return ret;
+
+	ret = auxiliary_device_add(adev);
+	if (ret) {
+		auxiliary_device_uninit(adev);
+		return ret;
+	}
+
+	return devm_add_action_or_reset(dev, th1520_pd_unregister_adev,
+					adev);
+}
+
 static int th1520_pd_pwrseq_gpu_init(struct device *dev)
 {
 	struct auxiliary_device *adev;
@@ -169,7 +196,7 @@ static int th1520_pd_pwrseq_gpu_init(struct device *dev)
 		return ret;
 	}
 
-	return devm_add_action_or_reset(dev, th1520_pd_pwrseq_unregister_adev,
+	return devm_add_action_or_reset(dev, th1520_pd_unregister_adev,
 					adev);
 }
 
@@ -235,6 +262,10 @@ static int th1520_pd_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_clean_provider;
 
+	ret = th1520_pd_reboot_init(dev, aon_chan);
+	if (ret)
+		goto err_clean_provider;
+
 	return 0;
 
 err_clean_provider:
-- 
2.50.1