linux-kernel - Re: [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and trigger support

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Message-ID: <20130816210955.GA2528@gmail.com>
Date:	Fri, 16 Aug 2013 22:10:02 +0100
From:	"Zubair Lutfullah :" <zubair.lutfullah@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Zubair Lutfullah <zubair.lutfullah@...il.com>, jic23@....ac.uk,
	dmitry.torokhov@...il.com, linux-iio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, Russ.Dill@...com
Subject: Re: [PATCH 4/4] iio: ti_am335x_adc: Add continuous sampling and
 trigger support

On Fri, Aug 16, 2013 at 04:59:49PM +0200, Sebastian Andrzej Siewior wrote:
> * Zubair Lutfullah | 2013-08-13 21:05:03 [+0100]:
> 
> >diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> >index 3ceac3e..0d7e313 100644
> >--- a/drivers/iio/adc/ti_am335x_adc.c
> >+++ b/drivers/iio/adc/ti_am335x_adc.c
> …
> 
> >+static int tiadc_buffer_postdisable(struct iio_dev *indio_dev)
> >+{
> >+	struct tiadc_device *adc_dev = iio_priv(indio_dev);
> >+	int config;
> >+
> >+	tiadc_step_config(indio_dev);
> >+	if (adc_dev->mfd_tscadc->tsc_cell == -1) {
> >+		config = tiadc_readl(adc_dev, REG_CTRL);
> >+		tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB));
> >+	}
> 
> This kind of check is bad. The tsc cell may have been created but the
> driver not enabled or loaded. Further you should document why you need
> to enable / disable the ADC in this places and only if the TSC part is
> not active.
> 
> Sebastian

Noted. I'll look into it.

Thanks for pointing it out.

Zubair
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