patch "iio: adc: cc10001: Add delay before setting START bit" added to staging-linus

patch "iio: adc: cc10001: Add delay before setting START bit" added to staging-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    iio: adc: cc10001: Add delay before setting START bit

to my staging git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.


>From f29b212edb9e253cafcb4a2ab7842a890989f1a5 Mon Sep 17 00:00:00 2001
From: Naidu Tellapati <naidu.tellapati@imgtec.com>
Date: Thu, 7 May 2015 18:22:20 -0300
Subject: iio: adc: cc10001: Add delay before setting START bit

According to hardware team there should be some delay after
setting channel number, start mode and before setting START.
Add a one microsecond delay for this purpose.

Fixes: 1664f6a5b0c8 ("iio: adc: Cosmic Circuits 10001 ADC driver")
Signed-off-by: Naidu Tellapati <naidu.tellapati@imgtec.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---
 drivers/iio/adc/cc10001_adc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/adc/cc10001_adc.c b/drivers/iio/adc/cc10001_adc.c
index fb7c5d2cc61a..115f6e99a7fa 100644
--- a/drivers/iio/adc/cc10001_adc.c
+++ b/drivers/iio/adc/cc10001_adc.c
@@ -100,6 +100,7 @@ static void cc10001_adc_start(struct cc10001_adc_device *adc_dev,
 	val = (channel & CC10001_ADC_CH_MASK) | CC10001_ADC_MODE_SINGLE_CONV;
 	cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);
 
+	udelay(1);
 	val = cc10001_adc_read_reg(adc_dev, CC10001_ADC_CONFIG);
 	val = val | CC10001_ADC_START_CONV;
 	cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);
-- 
2.4.0