linux-kernel - [PATCH v4 2/3] phy: core: add debugfs root

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Message-ID: <20221110132716.12294-2-chunfeng.yun@mediatek.com>
Date:   Thu, 10 Nov 2022 21:27:15 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <llvm@...ts.linux.dev>, Eddie Hung <eddie.hung@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>
Subject: [PATCH v4 2/3] phy: core: add debugfs root

Add a debugfs root for phy class, then phy drivers can add debugfs files
under this folder.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2~v4: no changes
---
 drivers/phy/phy-core.c  | 6 ++++++
 include/linux/phy/phy.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index d93ddf1262c5..2f9f69190519 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -11,6 +11,7 @@
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
@@ -1204,6 +1205,9 @@ void devm_of_phy_provider_unregister(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
 
+struct dentry *phy_debug_root;
+EXPORT_SYMBOL_GPL(phy_debug_root);
+
 /**
  * phy_release() - release the phy
  * @dev: the dev member within phy
@@ -1233,6 +1237,8 @@ static int __init phy_core_init(void)
 
 	phy_class->dev_release = phy_release;
 
+	phy_debug_root = debugfs_create_dir("phy", NULL);
+
 	return 0;
 }
 device_initcall(phy_core_init);
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index b1413757fcc3..c398749d49b9 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -205,6 +205,8 @@ struct phy_lookup {
 #define devm_of_phy_provider_register_full(dev, children, xlate) \
 	__devm_of_phy_provider_register(dev, children, THIS_MODULE, xlate)
 
+extern struct dentry *phy_debug_root;
+
 static inline void phy_set_drvdata(struct phy *phy, void *data)
 {
 	dev_set_drvdata(&phy->dev, data);
-- 
2.18.0