linux-kernel - [PATCH v2 3/3] i2c: npcm7xx: move to per-adapter debugfs directory

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Message-Id: <20231112225911.4650-2-wsa+renesas@sang-engineering.com>
Date:   Sun, 12 Nov 2023 17:59:11 -0500
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-renesas-soc@...r.kernel.org
Cc:     linux-i2c@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Andi Shyti <andi.shyti@...nel.org>, openbmc@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] i2c: npcm7xx: move to per-adapter debugfs directory

The I2C core now provides a per-adapter debugfs directory. Use it
instead of creating a custom one.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/i2c/busses/i2c-npcm7xx.c | 49 +++++---------------------------
 1 file changed, 7 insertions(+), 42 deletions(-)

diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index ae4bae63ad4f..54181b3f1919 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -326,7 +326,6 @@ struct npcm_i2c {
 	u8 slv_rd_buf[MAX_I2C_HW_FIFO_SIZE];
 	u8 slv_wr_buf[MAX_I2C_HW_FIFO_SIZE];
 #endif
-	struct dentry *debugfs; /* debugfs device directory */
 	u64 ber_cnt;
 	u64 rec_succ_cnt;
 	u64 rec_fail_cnt;
@@ -2250,27 +2249,15 @@ static const struct i2c_algorithm npcm_i2c_algo = {
 #endif
 };
 
-/* i2c debugfs directory: used to keep health monitor of i2c devices */
-static struct dentry *npcm_i2c_debugfs_dir;
-
 static void npcm_i2c_init_debugfs(struct platform_device *pdev,
 				  struct npcm_i2c *bus)
 {
-	struct dentry *d;
-
-	if (!npcm_i2c_debugfs_dir)
-		return;
-	d = debugfs_create_dir(dev_name(&pdev->dev), npcm_i2c_debugfs_dir);
-	if (IS_ERR_OR_NULL(d))
-		return;
-	debugfs_create_u64("ber_cnt", 0444, d, &bus->ber_cnt);
-	debugfs_create_u64("nack_cnt", 0444, d, &bus->nack_cnt);
-	debugfs_create_u64("rec_succ_cnt", 0444, d, &bus->rec_succ_cnt);
-	debugfs_create_u64("rec_fail_cnt", 0444, d, &bus->rec_fail_cnt);
-	debugfs_create_u64("timeout_cnt", 0444, d, &bus->timeout_cnt);
-	debugfs_create_u64("tx_complete_cnt", 0444, d, &bus->tx_complete_cnt);
-
-	bus->debugfs = d;
+	debugfs_create_u64("ber_cnt", 0444, bus->adap.debugfs, &bus->ber_cnt);
+	debugfs_create_u64("nack_cnt", 0444, bus->adap.debugfs, &bus->nack_cnt);
+	debugfs_create_u64("rec_succ_cnt", 0444, bus->adap.debugfs, &bus->rec_succ_cnt);
+	debugfs_create_u64("rec_fail_cnt", 0444, bus->adap.debugfs, &bus->rec_fail_cnt);
+	debugfs_create_u64("timeout_cnt", 0444, bus->adap.debugfs, &bus->timeout_cnt);
+	debugfs_create_u64("tx_complete_cnt", 0444, bus->adap.debugfs, &bus->tx_complete_cnt);
 }
 
 static int npcm_i2c_probe_bus(struct platform_device *pdev)
@@ -2362,7 +2349,6 @@ static void npcm_i2c_remove_bus(struct platform_device *pdev)
 	unsigned long lock_flags;
 	struct npcm_i2c *bus = platform_get_drvdata(pdev);
 
-	debugfs_remove_recursive(bus->debugfs);
 	spin_lock_irqsave(&bus->lock, lock_flags);
 	npcm_i2c_disable(bus);
 	spin_unlock_irqrestore(&bus->lock, lock_flags);
@@ -2385,28 +2371,7 @@ static struct platform_driver npcm_i2c_bus_driver = {
 	}
 };
 
-static int __init npcm_i2c_init(void)
-{
-	int ret;
-
-	npcm_i2c_debugfs_dir = debugfs_create_dir("npcm_i2c", NULL);
-
-	ret = platform_driver_register(&npcm_i2c_bus_driver);
-	if (ret) {
-		debugfs_remove_recursive(npcm_i2c_debugfs_dir);
-		return ret;
-	}
-
-	return 0;
-}
-module_init(npcm_i2c_init);
-
-static void __exit npcm_i2c_exit(void)
-{
-	platform_driver_unregister(&npcm_i2c_bus_driver);
-	debugfs_remove_recursive(npcm_i2c_debugfs_dir);
-}
-module_exit(npcm_i2c_exit);
+module_platform_driver(npcm_i2c_bus_driver);
 
 MODULE_AUTHOR("Avi Fishman <avi.fishman@...il.com>");
 MODULE_AUTHOR("Tali Perry <tali.perry@...oton.com>");
-- 
2.35.1