Patch "iio: adc: cc10001: Add delay before setting START bit" has been added to the 4.0-stable tree

Patch "iio: adc: cc10001: Add delay before setting START bit" has been added to the 4.0-stable tree

[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 the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iio-adc-cc10001-add-delay-before-setting-start-bit.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>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

From: Naidu Tellapati <naidu.tellapati@imgtec.com>

commit f29b212edb9e253cafcb4a2ab7842a890989f1a5 upstream.

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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/adc/cc10001_adc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/adc/cc10001_adc.c
+++ b/drivers/iio/adc/cc10001_adc.c
@@ -100,6 +100,7 @@ static void cc10001_adc_start(struct cc1
 	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);


Patches currently in stable-queue which might be from naidu.tellapati@imgtec.com are

queue-4.0/iio-adc-cc10001-fix-the-channel-number-mapping.patch
queue-4.0/iio-adc-cc10001-fix-regulator_get_voltage-return-value-check.patch
queue-4.0/iio-adc-cc10001-add-delay-before-setting-start-bit.patch
queue-4.0/iio-adc-cc10001-fix-incorrect-use-of-power-up-power-down-register.patch