linux-kernel - [PATCH v2 6/6] phy: core: Simplify API of_phy_simple

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Message-Id: <20241024-phy_core_fix-v2-6-fc0c63dbfcf3@quicinc.com>
Date: Thu, 24 Oct 2024 22:39:31 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Felipe Balbi <balbi@...com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Lee Jones <lee@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Christophe JAILLET <christophe.jaillet@...adoo.fr>, 
 Zijun Hu <zijun_hu@...oud.com>, stable@...r.kernel.org, 
 linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH v2 6/6] phy: core: Simplify API of_phy_simple_xlate()
 implementation

From: Zijun Hu <quic_zijuhu@...cinc.com>

Simplify of_phy_simple_xlate() implementation by API
class_find_device_by_of_node() which is also safer since it subsys_get()
the class's subsystem in advance of iterating over the class's devices.

Also correct comments to mark its parameter @dev as unused instead of
@args in passing.

Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/phy/phy-core.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index de0264dfc387..b83c6aa0287d 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -749,8 +749,8 @@ EXPORT_SYMBOL_GPL(devm_phy_put);

 /**
  * of_phy_simple_xlate() - returns the phy instance from phy provider
- * @dev: the PHY provider device
- * @args: of_phandle_args (not used here)
+ * @dev: the PHY provider device (not used here)
+ * @args: of_phandle_args
  *
  * Intended to be used by phy provider for the common case where #phy-cells is
  * 0. For other cases where #phy-cells is greater than '0', the phy provider
@@ -760,20 +760,14 @@ EXPORT_SYMBOL_GPL(devm_phy_put);
 struct phy *of_phy_simple_xlate(struct device *dev,
 				const struct of_phandle_args *args)
 {
-	struct phy *phy;
-	struct class_dev_iter iter;
-
-	class_dev_iter_init(&iter, &phy_class, NULL, NULL);
-	while ((dev = class_dev_iter_next(&iter))) {
-		phy = to_phy(dev);
-		if (args->np != phy->dev.of_node)
-			continue;
+	struct device *target_dev;

-		class_dev_iter_exit(&iter);
-		return phy;
+	target_dev = class_find_device_by_of_node(&phy_class, args->np);
+	if (target_dev) {
+		put_device(target_dev);
+		return to_phy(target_dev);
 	}

-	class_dev_iter_exit(&iter);
 	return ERR_PTR(-ENODEV);
 }
 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);

-- 
2.34.1