linux-kernel - [PATCH v2 2/2] i2c-mux-gpmux: Support settle-time-us property

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20211028125341.2457171-3-horatiu.vultur@microchip.com>
Date:   Thu, 28 Oct 2021 14:53:41 +0200
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 v2 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 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/muxes/i2c-mux-gpmux.c b/drivers/i2c/muxes/i2c-mux-gpmux.c
index d3acd8d66c32..569de1d8fdc1 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;
@@ -89,6 +90,9 @@ static int i2c_mux_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(mux->control),
 				     "failed to get control-mux\n");
 
+	mux->delay_us = 0;
+	of_property_read_u32(np, "settle-time-us", &mux->delay_us);
+
 	parent = mux_parent_adapter(dev);
 	if (IS_ERR(parent))
 		return dev_err_probe(dev, PTR_ERR(parent),
-- 
2.33.0