ASoC: nau8825: change crosstalk-bypass property to bool type

The property type of "nuvoton,crosstalk-bypass" changes to boolean.
The document is updated as well.
Signed-off-by: NJohn Hsu <KCHSU0@nuvoton.com>
Signed-off-by: NJohn Hsu <supercraig0719@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/nau8825.txt

@@ -69,6 +69,8 @@ Optional properties:
   - nuvoton,jack-insert-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
   - nuvoton,jack-eject-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
 
+  - nuvoton,crosstalk-bypass: make crosstalk function bypass if set.
+
   - clocks: list of phandle and clock specifier pairs according to common clock bindings for the
       clocks described in clock-names
   - clock-names: should include "mclk" for the MCLK master clock
@@ -96,6 +98,7 @@ Example:
       nuvoton,short-key-debounce = <2>;
       nuvoton,jack-insert-debounce = <7>;
       nuvoton,jack-eject-debounce = <7>;
+      nuvoton,crosstalk-bypass;
 
       clock-names = "mclk";
       clocks = <&tegra_car TEGRA210_CLK_CLK_OUT_2>;

sound/soc/codecs/nau8825.c

@@ -2506,10 +2506,8 @@ static int nau8825_read_device_properties(struct device *dev,
 		&nau8825->jack_eject_debounce);
 	if (ret)
 		nau8825->jack_eject_debounce = 0;
-	ret = device_property_read_u32(dev, "nuvoton,crosstalk-bypass",
-		&nau8825->xtalk_bypass);
-	if (ret)
-		nau8825->xtalk_bypass = 1;
+	nau8825->xtalk_bypass = device_property_read_bool(dev,
+		"nuvoton,crosstalk-bypass");
 
 	nau8825->mclk = devm_clk_get(dev, "mclk");
 	if (PTR_ERR(nau8825->mclk) == -EPROBE_DEFER) {