linux-kernel - [PATCH 4/8] spi: stm32: driver uses reset controller only at init

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Message-ID: <1612523342-10466-5-git-send-email-alain.volmat@foss.st.com>
Date:   Fri, 5 Feb 2021 12:08:58 +0100
From:   Alain Volmat <alain.volmat@...s.st.com>
To:     <broonie@...nel.org>, <amelie.delaunay@...s.st.com>
CC:     <mcoquelin.stm32@...il.com>, <alexandre.torgue@...s.st.com>,
        <linux-spi@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <fabrice.gasnier@...s.st.com>,
        <alain.volmat@...s.st.com>
Subject: [PATCH 4/8] spi: stm32: driver uses reset controller only at init

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

Remove reset controller device reference from the device private
structure since it is used only at probe time and can be discarded
once used to reset the SPI device.

Signed-off-by: Etienne Carriere <etienne.carriere@...com>
Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
---
 drivers/spi/spi-stm32.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 417a2aa2b98d..22bd3d1c8d69 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -268,7 +268,6 @@ struct stm32_spi_cfg {
  * @base: virtual memory area
  * @clk: hw kernel clock feeding the SPI clock generator
  * @clk_rate: rate of the hw kernel clock feeding the SPI clock generator
- * @rst: SPI controller reset line
  * @lock: prevent I/O concurrent access
  * @irq: SPI controller interrupt line
  * @fifo_size: size of the embedded fifo in bytes
@@ -294,7 +293,6 @@ struct stm32_spi {
 	void __iomem *base;
 	struct clk *clk;
 	u32 clk_rate;
-	struct reset_control *rst;
 	spinlock_t lock; /* prevent I/O concurrent access */
 	int irq;
 	unsigned int fifo_size;
@@ -1831,6 +1829,7 @@ static int stm32_spi_probe(struct platform_device *pdev)
 	struct spi_master *master;
 	struct stm32_spi *spi;
 	struct resource *res;
+	struct reset_control *rst;
 	int ret;
 
 	master = spi_alloc_master(&pdev->dev, sizeof(struct stm32_spi));
@@ -1892,11 +1891,11 @@ static int stm32_spi_probe(struct platform_device *pdev)
 		goto err_clk_disable;
 	}
 
-	spi->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
-	if (!IS_ERR(spi->rst)) {
-		reset_control_assert(spi->rst);
+	rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+	if (!IS_ERR(rst)) {
+		reset_control_assert(rst);
 		udelay(2);
-		reset_control_deassert(spi->rst);
+		reset_control_deassert(rst);
 	}
 
 	if (spi->cfg->has_fifo)
-- 
2.17.1