linux-kernel - [PATCH 2/3] iio: adc: ti-ads8344: remove tx

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Date:   Wed, 15 Apr 2020 23:22:56 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 2/3] iio: adc: ti-ads8344: remove tx_buf from driver data

There is no need to keep tx_buf around, it is only used for the conversion.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/iio/adc/ti-ads8344.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/adc/ti-ads8344.c b/drivers/iio/adc/ti-ads8344.c
index 6da50ea35217..9b2d3a8ea6bd 100644
--- a/drivers/iio/adc/ti-ads8344.c
+++ b/drivers/iio/adc/ti-ads8344.c
@@ -22,13 +22,7 @@
 struct ads8344 {
 	struct spi_device *spi;
 	struct regulator *reg;
-	/*
-	 * Lock protecting access to adc->tx_buff and rx_buff,
-	 * especially from concurrent read on sysfs file.
-	 */
-	struct mutex lock;
-
-	u8 tx_buf ____cacheline_aligned;
+	struct mutex lock; /* protect from concurrent conversions */
 };
 
 #define ADS8344_VOLTAGE_CHANNEL(chan, si)				\
@@ -77,13 +71,13 @@ static int ads8344_adc_conversion(struct ads8344 *adc, int channel,
 	int ret;
 	u8 buf[3];
 
-	adc->tx_buf = ADS8344_START;
+	buf[0] = ADS8344_START;
 	if (!differential)
-		adc->tx_buf |= ADS8344_SINGLE_END;
-	adc->tx_buf |= ADS8344_CHANNEL(channel);
-	adc->tx_buf |= ADS8344_CLOCK_INTERNAL;
+		buf[0] |= ADS8344_SINGLE_END;
+	buf[0] |= ADS8344_CHANNEL(channel);
+	buf[0] |= ADS8344_CLOCK_INTERNAL;
 
-	ret = spi_write(spi, &adc->tx_buf, 1);
+	ret = spi_write(spi, buf, 1);
 	if (ret)
 		return ret;
 
-- 
2.25.2