linux-kernel - [PATCH 1/2] iio: dac: stm32-dac: use reset controller only at probe time

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Date:   Mon, 13 Jan 2020 14:14:25 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <fabrice.gasnier@...com>,
        <olivier.moysan@...com>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <etienne.carriere@...com>
Subject: [PATCH 1/2] iio: dac: stm32-dac: use reset controller only at probe time

From: Etienne Carriere <etienne.carriere@...com>

This change removes the reset controller reference from the local
DAC instance since it is used only at probe time.

Signed-off-by: Etienne Carriere <etienne.carriere@...com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 drivers/iio/dac/stm32-dac-core.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/dac/stm32-dac-core.c b/drivers/iio/dac/stm32-dac-core.c
index 9e6b4cd..4d93446 100644
--- a/drivers/iio/dac/stm32-dac-core.c
+++ b/drivers/iio/dac/stm32-dac-core.c
@@ -20,13 +20,11 @@
 /**
  * struct stm32_dac_priv - stm32 DAC core private data
  * @pclk:		peripheral clock common for all DACs
- * @rst:		peripheral reset control
  * @vref:		regulator reference
  * @common:		Common data for all DAC instances
  */
 struct stm32_dac_priv {
 	struct clk *pclk;
-	struct reset_control *rst;
 	struct regulator *vref;
 	struct stm32_dac_common common;
 };
@@ -94,6 +92,7 @@ static int stm32_dac_probe(struct platform_device *pdev)
 	struct regmap *regmap;
 	struct resource *res;
 	void __iomem *mmio;
+	struct reset_control *rst;
 	int ret;
 
 	if (!dev->of_node)
@@ -148,11 +147,11 @@ static int stm32_dac_probe(struct platform_device *pdev)
 	priv->common.vref_mv = ret / 1000;
 	dev_dbg(dev, "vref+=%dmV\n", priv->common.vref_mv);
 
-	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
-	if (!IS_ERR(priv->rst)) {
-		reset_control_assert(priv->rst);
+	rst = devm_reset_control_get_exclusive(dev, NULL);
+	if (!IS_ERR(rst)) {
+		reset_control_assert(rst);
 		udelay(2);
-		reset_control_deassert(priv->rst);
+		reset_control_deassert(rst);
 	}
 
 	if (cfg && cfg->has_hfsel) {
-- 
2.7.4