linux-kernel - [PATCH 2/3] i2c: k1: add reset support

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Message-Id: <20251119-i2c-k1_reset-support-v1-2-0e9e82bf9b65@gmail.com>
Date: Wed, 19 Nov 2025 19:46:44 +0800
From: Encrow Thorne <jyc0019@...il.com>
To: Troy Mitchell <troy.mitchell@...ux.spacemit.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, Paul Walmsley <pjw@...nel.org>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Troy Mitchell <troymitchell988@...il.com>, linux-i2c@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Encrow Thorne <jyc0019@...il.com>
Subject: [PATCH 2/3] i2c: k1: add reset support

Add reset control handling to the K1 I2C driver.

Signed-off-by: Encrow Thorne <jyc0019@...il.com>
---
 drivers/i2c/busses/i2c-k1.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c
index 6b918770e612..64d817d8315d 100644
--- a/drivers/i2c/busses/i2c-k1.c
+++ b/drivers/i2c/busses/i2c-k1.c
@@ -10,6 +10,7 @@
  #include <linux/module.h>
  #include <linux/of_address.h>
  #include <linux/platform_device.h>
+ #include <linux/reset.h>
 
 /* spacemit i2c registers */
 #define SPACEMIT_ICR		 0x0		/* Control register */
@@ -113,6 +114,7 @@ struct spacemit_i2c_dev {
 	void __iomem *base;
 	int irq;
 	u32 clock_freq;
+	struct reset_control *resets;
 
 	struct i2c_msg *msgs;
 	u32 msg_num;
@@ -571,6 +573,15 @@ static int spacemit_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(clk))
 		return dev_err_probe(dev, PTR_ERR(clk), "failed to enable bus clock");
 
+	i2c->resets = devm_reset_control_get_optional(dev, NULL);
+	if (IS_ERR(i2c->resets))
+		return dev_err_probe(dev, PTR_ERR(i2c->resets),
+				    "failed to get reset\n");
+
+	reset_control_assert(i2c->resets);
+	udelay(2);
+	reset_control_deassert(i2c->resets);
+
 	spacemit_i2c_reset(i2c);
 
 	i2c_set_adapdata(&i2c->adapt, i2c);

-- 
2.25.1