pinctrl: pinctrl-single: Add pinctrl-single,bits type of mux

With pinctrl-single,bits it is possible to update just part of the register
within the pinctrl-single,function-mask area.
This is useful when one register configures mmore than one pin's mux.

pinctrl-single,bits takes three parameters:
<reg offset, value, sub-mask>

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
[Removed a misplaced comment]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 38 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
index 5187f0dd8b2..2c81e45f137 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
@@ -14,10 +14,12 @@ Optional properties:
 - pinctrl-single,function-off : function off mode for disabled state if
   available and same for all registers; if not specified, disabling of
   pin functions is ignored
+- pinctrl-single,bit-per-mux : boolean to indicate that one register controls
+  more than one pin
 
-This driver assumes that there is only one register for each pin,
-and uses the common pinctrl bindings as specified in the pinctrl-bindings.txt
-document in this directory.
+This driver assumes that there is only one register for each pin (unless the
+pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
+specified in the pinctrl-bindings.txt document in this directory.
 
 The pin configuration nodes for pinctrl-single are specified as pinctrl
 register offset and value pairs using pinctrl-single,pins. Only the bits
@@ -31,6 +33,15 @@ device pinctrl register, and 0x118 contains the desired value of the
 pinctrl register. See the device example and static board pins example
 below for more information.
 
+In case when one register changes more than one pin's mux the
+pinctrl-single,bits need to be used which takes three parameters:
+
+	pinctrl-single,bits = <0xdc 0x18, 0xff>;
+
+Where 0xdc is the offset from the pinctrl register base address for the
+device pinctrl register, 0x18 is the desired value, and 0xff is the sub mask to
+be used when applying this change to the register.
+
 Example:
 
 /* SoC common file */
@@ -55,6 +66,15 @@ pmx_wkup: pinmux@4a31e040 {
 	pinctrl-single,function-mask = <0xffff>;
 };
 
+control_devconf0: pinmux@48002274 {
+	compatible = "pinctrl-single";
+	reg = <0x48002274 4>;	/* Single register */
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-single,bit-per-mux;
+	pinctrl-single,register-width = <32>;
+	pinctrl-single,function-mask = <0x5F>;
+};
 
 /* board specific .dts file */
 
@@ -87,6 +107,21 @@ pmx_wkup: pinmux@4a31e040 {
 	};
 };
 
+&control_devconf0 {
+	mcbsp1_pins: pinmux_mcbsp1_pins {
+		pinctrl-single,bits = <
+			0x00 0x18 0x18 /* FSR/CLKR signal from FSX/CLKX pin */
+		>;
+	};
+
+	mcbsp2_clks_pins: pinmux_mcbsp2_clks_pins {
+		pinctrl-single,bits = <
+			0x00 0x40 0x40 /* McBSP2 CLKS from McBSP_CLKS pin */
+		>;
+	};
+
+};
+
 &uart2 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart2_pins>;