linux-kernel - [PATCH] i2c: cadence: Add shutdown handler

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Message-ID: <20250611044629.27429-1-ajay.neeli@amd.com>
Date: Wed, 11 Jun 2025 10:16:29 +0530
From: Ajay Neeli <ajay.neeli@....com>
To: <git@....com>, <andi.shyti@...nel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-i2c@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <michal.simek@....com>, <srinivas.goud@....com>,
	<radhey.shyam.pandey@....com>, Ajay Neeli <ajay.neeli@....com>
Subject: [PATCH] i2c: cadence: Add shutdown handler

Implement shutdown function for Cadence I2C driver to suspend the bus
during system "reboot" or "shutdown".

Signed-off-by: Ajay Neeli <ajay.neeli@....com>
---
 drivers/i2c/busses/i2c-cadence.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index 8df63aa..5f121af 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -1636,6 +1636,20 @@ static void cdns_i2c_remove(struct platform_device *pdev)
 	reset_control_assert(id->reset);
 }
 
+/**
+ * cdns_i2c_shutdown - Shutdown the i2c device
+ * @pdev:	Handle to the platform device structure
+ *
+ * This function handles shutdown sequence
+ */
+static void cdns_i2c_shutdown(struct platform_device *pdev)
+{
+	struct cdns_i2c *id = platform_get_drvdata(pdev);
+
+	/* Initiate failure of client i2c transfers */
+	i2c_mark_adapter_suspended(&id->adap);
+}
+
 static struct platform_driver cdns_i2c_drv = {
 	.driver = {
 		.name  = DRIVER_NAME,
@@ -1644,6 +1658,7 @@ static void cdns_i2c_remove(struct platform_device *pdev)
 	},
 	.probe  = cdns_i2c_probe,
 	.remove = cdns_i2c_remove,
+	.shutdown = cdns_i2c_shutdown,
 };
 
 module_platform_driver(cdns_i2c_drv);
-- 
1.8.3.1