[PATCH 1/6] ASoC: stm32: sai: manage error when getting reset controller

From: Olivier Moysan <olivier.moysan@st.com>
To: <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>,
	<tiwai@suse.com>, <mcoquelin.stm32@gmail.com>,
	<alexandre.torgue@st.com>, <alsa-devel@alsa-project.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-kernel@vger.kernel.org>, <olivier.moysan@st.com>
Cc: Etienne Carriere <etienne.carriere@st.com>
Subject: [PATCH 1/6] ASoC: stm32: sai: manage error when getting reset controller
Date: Mon, 3 Feb 2020 11:08:09 +0100	[thread overview]
Message-ID: <20200203100814.22944-2-olivier.moysan@st.com> (raw)
In-Reply-To: <20200203100814.22944-1-olivier.moysan@st.com>

Return an error when the SAI driver fails to get a reset controller.
Also add an error trace, except on probe defer status.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 sound/soc/stm/stm32_sai.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c
index e20267504b16..b824ba6cb028 100644
--- a/sound/soc/stm/stm32_sai.c
+++ b/sound/soc/stm/stm32_sai.c
@@ -197,12 +197,16 @@ static int stm32_sai_probe(struct platform_device *pdev)
 		return sai->irq;
 
 	/* reset */
-	rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
-	if (!IS_ERR(rst)) {
-		reset_control_assert(rst);
-		udelay(2);
-		reset_control_deassert(rst);
+	rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(rst)) {
+		if (PTR_ERR(rst) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Reset controller error %ld\n",
+				PTR_ERR(rst));
+		return PTR_ERR(rst);
 	}
+	reset_control_assert(rst);
+	udelay(2);
+	reset_control_deassert(rst);
 
 	/* Enable peripheral clock to allow register access */
 	ret = clk_prepare_enable(sai->pclk);
-- 
2.17.1

