ARM: mvebu: add audio support to Armada 370 DB

This commit adds the necessary Device Tree informations to enable
audio support on the Armada 370 DB platform. In details it:

 * Instantiates the CS42L51 audio codec on the I2C0 bus, and
   configures this bus with the appropriate pin-muxing configuration.

 * Enables the I2S audio controller, and configures it with the
   appropriate pin-muxing configuration.

 * Through hog pins, ensures that the other pins possibly used for I2S
   are muxed with another function than I2S.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/armada-370-db.dts b/arch/arm/boot/dts/armada-370-db.dts
index 08a56bcfc724..7df18660939b 100644
--- a/arch/arm/boot/dts/armada-370-db.dts
+++ b/arch/arm/boot/dts/armada-370-db.dts
@@ -64,6 +64,22 @@
                                 phy-mode = "rgmii-id";
                         };
 
+                        i2c@11000 {
+                                pinctrl-0 = <&i2c0_pins>;
+                                pinctrl-names = "default";
+                                status = "okay";
+                                audio_codec: audio-codec@4a {
+                                        compatible = "cirrus,cs42l51";
+                                        reg = <0x4a>;
+                                };
+                        };
+
+                        audio-controller@30000 {
+                                pinctrl-0 = <&i2s_pins2>;
+                                pinctrl-names = "default";
+                                status = "okay";
+                        };
+
                         mvsdio@d4000 {
                                 pinctrl-0 = <&sdio_pins1>;
                                 pinctrl-names = "default";
@@ -80,6 +96,30 @@
                                 broken-cd;
                         };
 
+                        pinctrl {
+                                /*
+                                 * These pins might be muxed as I2S by
+                                 * the bootloader, but it conflicts
+                                 * with the real I2S pins that are
+                                 * muxed using i2s_pins. We must mux
+                                 * those pins to a function other than
+                                 * I2S.
+                                 */
+                                pinctrl-0 = <&hog_pins1 &hog_pins2>;
+                                pinctrl-names = "default";
+
+                                hog_pins1: hog-pins1 {
+                                        marvell,pins = "mpp6",  "mpp8", "mpp10",
+                                                       "mpp12", "mpp13";
+                                        marvell,function = "gpio";
+                                };
+
+                                hog_pins2: hog-pins2 {
+                                        marvell,pins = "mpp5", "mpp7", "mpp9";
+                                        marvell,function = "gpo";
+                                };
+                        };
+
                         usb@50000 {
                                 status = "okay";
                         };
@@ -112,10 +152,18 @@
                                 /* Port 0, Lane 0 */
                                 status = "okay";
                         };
+
                         pcie@2,0 {
                                 /* Port 1, Lane 0 */
                                 status = "okay";
                         };
                 };
         };
+
+        sound {
+              compatible = "marvell,a370db-audio";
+              marvell,audio-controller = <&audio_controller>;
+              marvell,audio-codec = <&audio_codec>;
+              status = "okay";
+        };
 };