linux-kernel - [PATCH 3.12 050/123] iio: adc: at91_adc: allow to use full range of startup time

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Date:	Tue,  4 Aug 2015 16:39:54 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Jan Leupold <leupold@...-elektrotechnik.de>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 050/123] iio: adc: at91_adc: allow to use full range of startup time

From: Jan Leupold <leupold@...-elektrotechnik.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2ab5f39bc7825808e0fa1e7e5f0b23e174563467 upstream.

The DT-Property "atmel,adc-startup-time" is stored in an u8 for a microsecond
value. When trying to increase the value of STARTUP in Register AT91_ADC_MR
some higher values can't be reached.

Change the type in function parameter and private structure field from u8 to
u32.

Signed-off-by: Jan Leupold <leupold@...-elektrotechnik.de>
[nicolas.ferre@...el.com: change commit message, increase u16 to u32 for startup time]
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz> [-js: only change at91_adc_state for 3.12]
---
 drivers/iio/adc/at91_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index b023cd3fe4f1..869ee8b7640b 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -55,7 +55,7 @@ struct at91_adc_state {
 	u8			num_channels;
 	void __iomem		*reg_base;
 	struct at91_adc_reg_desc *registers;
-	u8			startup_time;
+	u32			startup_time;
 	u8			sample_hold_time;
 	bool			sleep_mode;
 	struct iio_trigger	**trig;
-- 
2.5.0

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