[PATCH 4/8] phy: tegra: xusb: Use devm_clk_get_optional to fetch USB2 tracking clock

From: Wayne Chang <waynec@nvidia.com>
To: <mathias.nyman@intel.com>, <vkoul@kernel.org>,
	<neil.armstrong@linaro.org>, <robh@kernel.org>,
	<krzk+dt@kernel.org>, <conor+dt@kernel.org>,
	<gregkh@linuxfoundation.org>, <thierry.reding@gmail.com>,
	<jonathanh@nvidia.com>
Cc: <waynec@nvidia.com>, <linux-usb@vger.kernel.org>,
	<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-phy@lists.infradead.org>, <devicetree@vger.kernel.org>,
	Sing-Han Chen <singhanc@nvidia.com>
Subject: [PATCH 4/8] phy: tegra: xusb: Use devm_clk_get_optional to fetch USB2 tracking clock
Date: Mon, 29 Jun 2026 17:34:02 +0800	[thread overview]
Message-ID: <20260629093406.1118594-5-waynec@nvidia.com> (raw)
In-Reply-To: <20260629093406.1118594-1-waynec@nvidia.com>

From: Sing-Han Chen <singhanc@nvidia.com>

The USB2 PAD tracking clock is an optional clock so use
devm_clk_get_optional() so a missing clock in devicetree is
represented as NULL and probe can continue. clk_prepare_enable()
and clk_disable_unprepare() already treat a NULL clock as a no-op.

Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
Signed-off-by: Wayne Chang <waynec@nvidia.com>
---
 drivers/phy/tegra/xusb-tegra186.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index 60156aea2707..800be0cbb3f9 100644
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -1045,7 +1045,7 @@ tegra186_usb2_pad_probe(struct tegra_xusb_padctl *padctl,
 		goto out;
 	}
 
-	priv->usb2_trk_clk = devm_clk_get(&pad->dev, "trk");
+	priv->usb2_trk_clk = devm_clk_get_optional(&pad->dev, "trk");
 	if (IS_ERR(priv->usb2_trk_clk)) {
 		err = PTR_ERR(priv->usb2_trk_clk);
 		dev_dbg(&pad->dev, "failed to get usb2 trk clock: %d\n", err);
-- 
2.25.1

