linux-kernel - [PATCH 2/2] staging: iio: adc: ad7192: Add clock output option

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Date:   Thu, 6 Dec 2018 11:10:52 +0200
From:   Mircea Caprioru <mircea.caprioru@...log.com>
To:     <jic23@...nel.org>
CC:     <Michael.Hennerich@...log.com>, <knaack.h@....de>,
        <lars@...afoo.de>, <pmeerw@...erw.net>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <devel@...verdev.osuosl.org>,
        Mircea Caprioru <mircea.caprioru@...log.com>
Subject: [PATCH 2/2] staging: iio: adc: ad7192: Add clock output option

When using the internal clock the device has an option in which the clock
output is available on MCLK2 pin. This patch adds a dt binding for enabling
this property.

Signed-off-by: Mircea Caprioru <mircea.caprioru@...log.com>
---
 drivers/staging/iio/adc/ad7192.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 8a4e6ede42b3..a11c8a82bb7c 100644
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -611,6 +611,10 @@ static const struct iio_chan_spec ad7193_channels[] = {
 static int ad7192_clock_select(struct spi_device *spi, struct ad7192_state *st)
 {
 	int ret;
+	bool clock_out_en;
+
+	clock_out_en = of_property_read_bool(spi->dev.of_node,
+					     "adi,int-clock-output-enable");
 
 	st->clock_sel = AD7192_CLK_EXT_MCLK2;
 	st->mclk = devm_clk_get(&spi->dev, "clk");
@@ -626,7 +630,10 @@ static int ad7192_clock_select(struct spi_device *spi, struct ad7192_state *st)
 				return PTR_ERR(st->mclk);
 
 			/* use internal clock */
-			st->clock_sel = AD7192_CLK_INT;
+			if (!clock_out_en)
+				st->clock_sel = AD7192_CLK_INT;
+			else
+				st->clock_sel = AD7192_CLK_INT_CO;
 			st->fclk = AD7192_INT_FREQ_MHZ;
 		}
 	}
-- 
2.17.1