linux-kernel - [PATCH v2 3/3] iio: multiplexer: iio-mux: Support settle-time-us property

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Date:   Thu, 7 Oct 2021 15:46:41 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     <peda@...ntia.se>, <jic23@...nel.org>, <devicetree@...r.kernel.org>
CC:     <kernel@...s.com>, <lars@...afoo.de>, <linux-iio@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>
Subject: [PATCH v2 3/3] iio: multiplexer: iio-mux: Support settle-time-us property

If the devicetree specifies that the hardware requires a settle time,
pass this time on to the mux APIs.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 drivers/iio/multiplexer/iio-mux.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/multiplexer/iio-mux.c b/drivers/iio/multiplexer/iio-mux.c
index d54ae5cbe51b..f422d44377df 100644
--- a/drivers/iio/multiplexer/iio-mux.c
+++ b/drivers/iio/multiplexer/iio-mux.c
@@ -33,6 +33,7 @@ struct mux {
 	struct iio_chan_spec *chan;
 	struct iio_chan_spec_ext_info *ext_info;
 	struct mux_child *child;
+	u32 delay_us;
 };
 
 static int iio_mux_select(struct mux *mux, int idx)
@@ -42,7 +43,8 @@ static int iio_mux_select(struct mux *mux, int idx)
 	int ret;
 	int i;
 
-	ret = mux_control_select(mux->control, chan->channel);
+	ret = mux_control_select_delay(mux->control, chan->channel,
+				       mux->delay_us);
 	if (ret < 0) {
 		mux->cached_state = -1;
 		return ret;
@@ -392,6 +394,9 @@ static int mux_probe(struct platform_device *pdev)
 	mux->parent = parent;
 	mux->cached_state = -1;
 
+	mux->delay_us = 0;
+	of_property_read_u32(np, "settle-time-us", &mux->delay_us);
+
 	indio_dev->name = dev_name(dev);
 	indio_dev->info = &mux_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-- 
2.28.0