linux-kernel - [PATCH v3 2/2] i2c-mux-gpmux: Support settle-time-us property

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Date:   Mon, 1 Nov 2021 13:25:45 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <peda@...ntia.se>, <robh+dt@...nel.org>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: [PATCH v3 2/2] i2c-mux-gpmux: Support settle-time-us property

Add support for settle-time-us property. If this is defined in device
tree then add this delay to mux APIs.

Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/i2c/muxes/i2c-mux-gpmux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/muxes/i2c-mux-gpmux.c b/drivers/i2c/muxes/i2c-mux-gpmux.c
index d3acd8d66c32..f64a4b6034df 100644
--- a/drivers/i2c/muxes/i2c-mux-gpmux.c
+++ b/drivers/i2c/muxes/i2c-mux-gpmux.c
@@ -16,6 +16,7 @@
 
 struct mux {
 	struct mux_control *control;
+	u32 delay_us;
 
 	bool do_not_deselect;
 };
@@ -25,7 +26,7 @@ static int i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
 	struct mux *mux = i2c_mux_priv(muxc);
 	int ret;
 
-	ret = mux_control_select(mux->control, chan);
+	ret = mux_control_select_delay(mux->control, chan, mux->delay_us);
 	mux->do_not_deselect = ret < 0;
 
 	return ret;
@@ -106,6 +107,7 @@ static int i2c_mux_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, muxc);
 
+	of_property_read_u32(np, "settle-time-us", &mux->delay_us);
 	muxc->mux_locked = of_property_read_bool(np, "mux-locked");
 
 	for_each_child_of_node(np, child) {
-- 
2.33.0