linux-kernel - [PATCH 2/2] phy: stm32: defer probe for reset controller

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Date:   Tue, 10 Nov 2020 11:23:05 +0100
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Etienne Carriere <etienne.carriere@...com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Amelie Delaunay <amelie.delaunay@...com>
Subject: [PATCH 2/2] phy: stm32: defer probe for reset controller

Change stm32-usbphyc driver to defer its probe when the expected reset
control has its probe operation deferred.

Signed-off-by: Etienne Carriere <etienne.carriere@...com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
 drivers/phy/st/phy-stm32-usbphyc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/st/phy-stm32-usbphyc.c b/drivers/phy/st/phy-stm32-usbphyc.c
index fe3085eec201..f3f582a3ccdb 100644
--- a/drivers/phy/st/phy-stm32-usbphyc.c
+++ b/drivers/phy/st/phy-stm32-usbphyc.c
@@ -342,6 +342,10 @@ static int stm32_usbphyc_probe(struct platform_device *pdev)
 		reset_control_assert(usbphyc->rst);
 		udelay(2);
 		reset_control_deassert(usbphyc->rst);
+	} else {
+		ret = PTR_ERR(usbphyc->rst);
+		if (ret == -EPROBE_DEFER)
+			goto clk_disable;
 	}
 
 	usbphyc->switch_setup = -EINVAL;
-- 
2.17.1