linux-kernel - [PATCH] i3c: dw: Add apb reset support

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Message-ID: <20251102100237.9451-1-jszhang@kernel.org>
Date: Sun,  2 Nov 2025 18:02:37 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Frank Li <Frank.Li@....com>
Cc: linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i3c: dw: Add apb reset support

Add support of apb reset which is to reset the APB interface.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 drivers/i3c/master/dw-i3c-master.c | 9 +++++++++
 drivers/i3c/master/dw-i3c-master.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 9ceedf09c3b6..ca2863d2b2b7 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1558,7 +1558,13 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 	if (IS_ERR(master->core_rst))
 		return PTR_ERR(master->core_rst);
 
+	master->apb_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
+								    "apb_rst");
+	if (IS_ERR(master->apb_rst))
+		return PTR_ERR(master->apb_rst);
+
 	reset_control_deassert(master->core_rst);
+	reset_control_deassert(master->apb_rst);
 
 	spin_lock_init(&master->xferqueue.lock);
 	INIT_LIST_HEAD(&master->xferqueue.list);
@@ -1607,6 +1613,7 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 
 err_assert_rst:
 	reset_control_assert(master->core_rst);
+	reset_control_assert(master->apb_rst);
 
 	return ret;
 }
@@ -1711,6 +1718,7 @@ static int __maybe_unused dw_i3c_master_runtime_suspend(struct device *dev)
 	dw_i3c_master_disable(master);
 
 	reset_control_assert(master->core_rst);
+	reset_control_assert(master->apb_rst);
 	dw_i3c_master_disable_clks(master);
 	pinctrl_pm_select_sleep_state(dev);
 	return 0;
@@ -1723,6 +1731,7 @@ static int __maybe_unused dw_i3c_master_runtime_resume(struct device *dev)
 	pinctrl_pm_select_default_state(dev);
 	dw_i3c_master_enable_clks(master);
 	reset_control_deassert(master->core_rst);
+	reset_control_deassert(master->apb_rst);
 
 	dw_i3c_master_set_intr_regs(master);
 	dw_i3c_master_restore_timing_regs(master);
diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
index c5cb695c16ab..a4ba60043288 100644
--- a/drivers/i3c/master/dw-i3c-master.h
+++ b/drivers/i3c/master/dw-i3c-master.h
@@ -37,6 +37,7 @@ struct dw_i3c_master {
 	struct dw_i3c_master_caps caps;
 	void __iomem *regs;
 	struct reset_control *core_rst;
+	struct reset_control *apb_rst;
 	struct clk *core_clk;
 	struct clk *pclk;
 	char version[5];
-- 
2.51.0