From:   Nicolas Toromanoff <nicolas.toromanoff@foss.st.com>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>
CC:     Marek Vasut <marex@denx.de>,
        Nicolas Toromanoff <nicolas.toromanoff@foss.st.com>,
        Ard Biesheuvel <ardb@kernel.org>,
        <linux-crypto@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Etienne Carriere <etienne.carriere@foss.st.com>
Subject: [PATCH v4 1/9] crypto: stm32/cryp - defer probe for reset controller
Date:   Tue, 30 Nov 2021 08:54:53 +0100
Message-ID: <20211130075501.21958-2-nicolas.toromanoff@foss.st.com>
In-Reply-To: <20211130075501.21958-1-nicolas.toromanoff@foss.st.com>
References: <20211130075501.21958-1-nicolas.toromanoff@foss.st.com>
MIME-Version: 1.0
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From: Etienne Carriere <etienne.carriere@foss.st.com>

Change stm32 CRYP driver to defer its probe operation when
reset controller device is registered but has not been probed yet.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@foss.st.com>
---
 drivers/crypto/stm32/stm32-cryp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index 7389a0536ff0..dcdd313485de 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -1973,7 +1973,11 @@ static int stm32_cryp_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 
 	rst = devm_reset_control_get(dev, NULL);
-	if (!IS_ERR(rst)) {
+	if (IS_ERR(rst)) {
+		ret = PTR_ERR(rst);
+		if (ret == -EPROBE_DEFER)
+			goto err_rst;
+	} else {
 		reset_control_assert(rst);
 		udelay(2);
 		reset_control_deassert(rst);
@@ -2024,7 +2028,7 @@ static int stm32_cryp_probe(struct platform_device *pdev)
 	spin_lock(&cryp_list.lock);
 	list_del(&cryp->list);
 	spin_unlock(&cryp_list.lock);
-
+err_rst:
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 	pm_runtime_disable(dev);
-- 
2.17.1