linux-kernel - [PATCH] iio: adc: at91-sama5d2_adc: get rid of 5 degrees Celsius adjustment

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Message-ID: <20221020102705.3639204-1-claudiu.beznea@microchip.com>
Date:   Thu, 20 Oct 2022 13:27:05 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <eugen.hristev@...rochip.com>, <jic23@...nel.org>,
        <lars@...afoo.de>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>
CC:     <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH] iio: adc: at91-sama5d2_adc: get rid of 5 degrees Celsius adjustment

On SAMA7G5 final chip version there is no need for 5 degrees Celsius
adjustment when computing junction temperature, thus, remove it.

Fixes: 5ab38b81895c ("iio: adc: at91-sama5d2_adc: add support for temperature sensor")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 33e251552214..870f4cb60923 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -2307,11 +2307,9 @@ static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
 	clb->p6 = buf[AT91_ADC_TS_CLB_IDX_P6];
 
 	/*
-	 * We prepare here the conversion to milli and also add constant
-	 * factor (5 degrees Celsius) to p1 here to avoid doing it on
-	 * hotpath.
+	 * We prepare here the conversion to milli to avoid doing it on hotpath.
 	 */
-	clb->p1 = clb->p1 * 1000 + 5000;
+	clb->p1 = clb->p1 * 1000;
 
 free_buf:
 	kfree(buf);
-- 
2.34.1