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@xxxxxxxxxxxxxxx> know about it.
>From f29b212edb9e253cafcb4a2ab7842a890989f1a5 Mon Sep 17 00:00:00 2001
From: Naidu Tellapati <naidu.tellapati@xxxxxxxxxx>
Date: Thu, 7 May 2015 18:22:20 -0300
Subject: iio: adc: cc10001: Add delay before setting START bit
From: Naidu Tellapati <naidu.tellapati@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx 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
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