From: Wayne Chang <waynec@nvidia.com>
To: Vinod Koul <vkoul@kernel.org>, JC Kuo <jckuo@nvidia.com>,
Thierry Reding <thierry.reding@kernel.org>,
Jonathan Hunter <jonathanh@nvidia.com>,
"Neil Armstrong" <neil.armstrong@linaro.org>,
Manivannan Sadhasivam <mani@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: <linux-phy@lists.infradead.org>, <devicetree@vger.kernel.org>,
<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Sing-Han Chen <singhanc@nvidia.com>,
Wayne Chang <waynec@nvidia.com>
Subject: [PATCH V3 2/4] phy: tegra: xusb: Use devm_clk_get_optional to fetch USB2 tracking clock
Date: Thu, 3 Sep 2026 15:19:35 +0800 [thread overview]
Message-ID: <20260903071937.533646-3-waynec@nvidia.com> (raw)
In-Reply-To: <20260903071937.533646-1-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>
---
V2 -> V3: No change
V1 -> V2: No change
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
--
linux-phy mailing list
linux-phy@lists.infradead.org
https://lists.infradead.org/mailman/listinfo/linux-phy
next prev parent reply other threads:[~2026-09-03 7:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 7:19 [PATCH V3 0/4] phy: tegra: xusb: Add Tegra264 support Wayne Chang
2026-09-03 7:19 ` [PATCH V3 1/4] dt-bindings: phy: tegra-xusb: Add support for Tegra264 Wayne Chang
2026-09-03 17:34 ` Conor Dooley
2026-09-03 7:19 ` Wayne Chang [this message]
2026-09-03 7:32 ` [PATCH V3 2/4] phy: tegra: xusb: Use devm_clk_get_optional to fetch USB2 tracking clock sashiko-bot
2026-09-03 7:19 ` [PATCH V3 3/4] phy: tegra: xusb: Increase timeout for USB2_TRK_COMPLETED polling Wayne Chang
2026-09-03 7:19 ` [PATCH V3 4/4] phy: tegra: xusb: Add Tegra264 support Wayne Chang
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