mfd: wm8994: Allow to configure CS/ADDR Pulldown from dts

For designs where CS/ADDR pin is floating, it is useful to
allow dts to define whether to keep internal pull down or not.
Signed-off-by: NAlberto Panizzo <alberto@amarulasolutions.com>
Signed-off-by: NAnthony Brandon <anthony@amarulasolutions.com>
Acked-by: NCharles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/wm8994-core.c

@@ -304,6 +304,8 @@ static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 
 	pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
 
+	pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
+
 	pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
 	if (pdata->ldo[0].enable < 0)
 		pdata->ldo[0].enable = 0;
@@ -562,6 +564,8 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 
 	if (pdata->spkmode_pu)
 		pulls |= WM8994_SPKMODE_PU;
+	if (pdata->csnaddr_pd)
+		pulls |= WM8994_CSNADDR_PD;
 
 	/* Disable unneeded pulls */
 	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,

include/linux/mfd/wm8994/pdata.h

@@ -222,6 +222,12 @@ struct wm8994_pdata {
 	 */
 	bool spkmode_pu;
 
+	/*
+	 * CS/ADDR must be pulled internally by the device on this
+	 * system.
+	 */
+	bool csnaddr_pd;
+
 	/**
 	 * Maximum number of channels clocks will be generated for,
 	 * useful for systems where and I2S bus with multiple data