linux-kernel - [PATCH v3 03/14] mux: core: Add of_mux_control

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Date:   Fri, 22 Sep 2017 20:37:52 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Peter Rosin <peda@...ntia.se>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, devel@...verdev.osuosl.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [PATCH v3 03/14] mux: core: Add of_mux_control_get helper function

Currently the mux_control_get implementation only deals with getting
mux controllers on DT platforms. This commit renames the current
implementation to of_mux_control_get to reflect this and makes
mux_control_get a wrapper around of_mux_control_get.

This is a preparation patch for adding support for getting muxes on
non DT platforms.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/mux/core.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/mux/core.c b/drivers/mux/core.c
index d0ad56abca2a..8c0a4c83cdc5 100644
--- a/drivers/mux/core.c
+++ b/drivers/mux/core.c
@@ -439,7 +439,7 @@ static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
 }
 
 static struct mux_control *
-__mux_control_get(struct device *dev, const char *mux_name, bool optional)
+of_mux_control_get(struct device *dev, const char *mux_name, bool optional)
 {
 	struct device_node *np = dev->of_node;
 	struct of_phandle_args args;
@@ -500,6 +500,16 @@ __mux_control_get(struct device *dev, const char *mux_name, bool optional)
 	return &mux_chip->mux[controller];
 }
 
+static struct mux_control *
+__mux_control_get(struct device *dev, const char *mux_name, bool optional)
+{
+	/* look up via DT first */
+	if (IS_ENABLED(CONFIG_OF) && dev->of_node)
+		return of_mux_control_get(dev, mux_name, optional);
+
+	return optional ? NULL : ERR_PTR(-ENODEV);
+}
+
 /**
  * mux_control_get() - Get the mux-control for a device.
  * @dev: The device that needs a mux-control.
-- 
2.14.1