Add the Lantiq PEF2256 audio support

new file mode 100644
index 000000000000..e2c2959a21f0
@@ -0,0 +1,270 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/lantiq,pef2256.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lantiq PEF2256
+
+maintainers:
+  - Herve Codina <[email protected]>
+
+description:
+  The Lantiq PEF2256, also known as Infineon PEF2256 or FALC56, is a framer and
+  line interface component designed to fulfill all required interfacing between
+  an analog E1/T1/J1 line and the digital PCM system highway/H.100 bus.
+
+properties:
+  compatible:
+    items:
+      - const: lantiq,pef2256
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Master clock
+      - description: Receive System Clock
+      - description: Transmit System Clock
+
+  clock-names:
+    items:
+      - const: mclk
+      - const: sclkr
+      - const: sclkx
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    description:
+      GPIO used to reset the device.
+    maxItems: 1
+
+  pinctrl:
+    $ref: /schemas/pinctrl/pinctrl.yaml#
+
+    patternProperties:
+      '-pins$':
+        type: object
+        $ref: /schemas/pinctrl/pincfg-node.yaml#
+
+        properties:
+          pins:
+            enum: [ RPA, RPB, RPC, RPD, XPA, XPB, XPC, XPD ]
+
+          function:
+            enum: [ SYPR, RFM, RFMB, RSIGM, RSIG, DLR, FREEZE, RFSP, LOS,
+                    SYPX, XFMS, XSIG, TCLK, XMFB, XSIGM, DLX, XCLK, XLT,
+                    GPI, GPOH, GPOL ]
+
+        additionalProperties: false
+
+        required:
+          - pins
+          - function
+
+    additionalProperties: false
+
+  lantiq,line-interface:
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [e1, t1j1]
+    default: e1
+    description: |
+      The line interface type
+        - e1: E1 line
+        - t1j1: T1/J1 line
+
+  lantiq,frame-format:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      The line interface frame format.
+
+  lantiq,data-rate-bps:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [2048000, 4096000, 8192000, 16384000]
+    default: 2048000
+    description:
+      Data rate (bit per seconds) on the system highway.
+
+  lantiq,clock-falling-edge:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Data is sent on falling edge of the clock (and received on the rising
+      edge). If 'clock-falling-edge' is not present, data is sent on the
+      rising edge (and received on the falling edge).
+
+  lantiq,channel-phase:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3, 4, 5, 6, 7]
+    default: 0
+    description:
+      The pef2256 delivers a full frame (32 8bit time-slots in E1 and 24 8bit
+      time-slots 8 8bit signaling in E1/J1) every 125us. This lead to a data
+      rate of 2048000 bit/s. When lantiq,data-rate-bps is more than 2048000
+      bit/s, the data (all 32 8bit) present in the frame are interleave with
+      unused time-slots. The lantiq,channel-phase property allows to set the
+      correct alignment of the interleave mechanism.
+      For instance, suppose lantiq,data-rate-bps = 8192000 (ie 4*2048000), and
+      lantiq,channel-phase = 2, the interleave schema with unused time-slots
+      (nu) and used time-slots (XX) for TSi is
+        nu nu XX nu nu nu XX nu nu nu XX nu
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+      With lantiq,data-rate-bps = 8192000, and lantiq,channel-phase = 1, the
+      interleave schema is
+        nu XX nu nu nu XX nu nu nu XX nu nu
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+      With lantiq,data-rate-bps = 4096000 (ie 2*2048000), and
+      lantiq,channel-phase = 1, the interleave schema is
+        nu    XX    nu    XX    nu    XX
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+
+  lantiq,subordinate:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If present, the pef2256 works in subordinate mode. In this mode it
+      synchronizes on line interface clock signals. Otherwise, it synchronizes
+      on internal clocks.
+
+patternProperties:
+  '^codec([0-9]|[1-2][0-9]|3[0-1])?$':
+    type: object
+    $ref: /schemas/sound/dai-common.yaml
+    description:
+      Codec provided by the pef2256. This codec allows to use some of the PCM
+      system highway time-slots as audio channels to transport audio data over
+      the E1/T1/J1 lines.
+      The time-slots used by the codec must be set and so, the properties
+      'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
+      'dai-tdm-slot-rx-mask' must be present in the sound card node for
+      sub-nodes that involve the codec. The codec uses 8bit time-slots.
+      'dai-tdm-tdm-slot-with' must be set to 8.
+      The tx and rx masks define the pef2256 time-slots assigned to the codec.
+
+    properties:
+      compatible:
+        const: lantiq,pef2256-codec
+
+      '#sound-dai-cells':
+        const: 0
+
+    required:
+      - compatible
+      - '#sound-dai-cells'
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+allOf:
+  - if:
+      properties:
+        lantiq,line-interface:
+          contains:
+            const: e1
+    then:
+      properties:
+        lantiq,frame-format:
+          enum: [doubleframe, crc4-multiframe, auto-multiframe]
+          default: doubleframe
+          description: |
+            The E1 line interface frame format
+              - doubleframe: Doubleframe format
+              - crc4-multiframe: CRC4 multiframe format
+              - auto-multiframe: CRC4 multiframe format with interworking
+                                 capabilities (ITU-T G.706 Annex B)
+
+    else:
+      # T1/J1 line
+      properties:
+        lantiq,frame-format:
+          enum: [4frame, 12frame, 24frame, 72frame]
+          default: 12frame
+          description: |
+            The T1/J1 line interface frame format
+              - 4frame: 4-frame multiframe format (F4)
+              - 12frame: 12-frame multiframe format (F12, D3/4)
+              - 24frame: 24-frame multiframe format (ESF)
+              - 72frame: 72-frame multiframe format (F72, remote switch mode)
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    framer@2000000 {
+      compatible = "lantiq,pef2256", "simple-mfd";
+      reg = <0x2000000 0x100>;
+      interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
+      interrupt-parent = <&intc>;
+      clocks = <&clk_mclk>, <&clk_sclkr>, <&clk_sclkx>;
+      clock-names = "mclk", "sclkr", "sclkx";
+      reset-gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+      lantiq,data-rate-bps = <4096000>;
+
+      pinctrl {
+        pef2256_rpa_sypr: rpa-pins {
+          pins = "RPA";
+          function = "SYPR";
+        };
+        pef2256_xpa_sypx: xpa-pins {
+          pins = "XPA";
+          function = "SYPX";
+        };
+      };
+
+      pef2256_codec0: codec0 {
+        compatible = "lantiq,pef2256-codec";
+        #sound-dai-cells = <0>;
+        sound-name-prefix = "PEF2256_0";
+      };
+
+      pef2256_codec1: codec1 {
+        compatible = "lantiq,pef2256-codec";
+        #sound-dai-cells = <0>;
+        sound-name-prefix = "PEF2256_1";
+      };
+    };
+
+    sound {
+      compatible = "simple-audio-card";
+      #address-cells = <1>;
+      #size-cells = <0>;
+      simple-audio-card,dai-link@0 { /* CPU DAI1 - pef2256 codec 1 */
+        reg = <0>;
+        cpu {
+          sound-dai = <&cpu_dai1>;
+        };
+        codec {
+          sound-dai = <&pef2256_codec0>;
+          dai-tdm-slot-num = <4>;
+          dai-tdm-slot-width = <8>;
+          /* TS 1, 2, 3, 4 */
+          dai-tdm-slot-tx-mask = <0 1 1 1 1>;
+          dai-tdm-slot-rx-mask = <0 1 1 1 1>;
+        };
+      };
+      simple-audio-card,dai-link@1 { /* CPU DAI2 - pef2256 codec 2 */
+        reg = <1>;
+        cpu {
+          sound-dai = <&cpu_dai2>;
+        };
+        codec {
+          sound-dai = <&pef2256_codec1>;
+          dai-tdm-slot-num = <4>;
+          dai-tdm-slot-width = <8>;
+          /* TS 5, 6, 7, 8 */
+          dai-tdm-slot-tx-mask = <0 0 0 0 0 1 1 1 1>;
+          dai-tdm-slot-rx-mask = <0 0 0 0 0 1 1 1 1>;
+        };
+      };
+    };

index fcc141e067b9..74c3750d21e4 100644
@@ -1063,6 +1063,23 @@ config PCF50633_GPIO
 	  Say yes here if you want to include support GPIO for pins on
 	  the PCF50633 chip.
 
+config MFD_PEF2256
+	tristate "Lantiq PEF2256 (FALC56) framer"
+	depends on OF
+	select PINCTRL
+	select PINMUX
+	select GENERIC_PINCONF
+	help
+	  This option enables support for the Lantiq PEF2256 framer, also known
+	  as FALC56. This framer and its line interface component is designed
+	  to fulfill all required interfacing between analog E1/T1/J1 lines and
+	  the digital PCM system highway.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pef2256.
+
 config MFD_PM8XXX
 	tristate "Qualcomm PM8xxx PMIC chips driver"
 	depends on (ARM || HEXAGON || COMPILE_TEST)

index 2f6c89d1e277..b2bb6e6a141c 100644
@@ -195,6 +195,7 @@ obj-$(CONFIG_MFD_SI476X_CORE)	+= si476x-core.o
 
 obj-$(CONFIG_MFD_CS5535)	+= cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)	+= omap-usb-host.o omap-usb-tll.o
+obj-$(CONFIG_MFD_PEF2256)	+= pef2256.o
 obj-$(CONFIG_MFD_PM8XXX) 	+= qcom-pm8xxx.o ssbi.o
 obj-$(CONFIG_MFD_QCOM_RPM)	+= qcom_rpm.o
 obj-$(CONFIG_MFD_SPMI_PMIC)	+= qcom-spmi-pmic.o

new file mode 100644
index 000000000000..95ba1ae55daf
@@ -0,0 +1,12 @@
+What:		/sys/bus/platform/devices/*.pef2256/subordinate
+KernelVersion:	6.4
+Contact:	Herve Codina <[email protected]>
+Description:
+		(RW) Controls whether the PEF2256 works as subordinate or main
+		device mode.
+
+		- 0: main device mode
+		- 1: subordinate mode
+
+		In subordinate device mode it synchronizes on line interface
+		clock signals. Otherwise, it synchronizes on internal clocks.

index 0be061953e9a..4f78da914fc7 100644
@@ -168,6 +168,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_PCM512x_I2C
 	imply SND_SOC_PCM512x_SPI
 	imply SND_SOC_PEB2466
+	imply SND_SOC_PEF2256
 	imply SND_SOC_RK3328
 	imply SND_SOC_RK817
 	imply SND_SOC_RT274

@@ -1252,6 +1253,19 @@ config SND_SOC_PEB2466
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-soc-peb2466.
 
+config SND_SOC_PEF2256
+	tristate "Lantiq PEF2256 codec"
+	depends on MFD_PEF2256
+	help
+	  Enable support for the Lantiq PEF2256 (FALC56) codec.
+	  The PEF2256 is a framer and line interface between analog E1/T1/J1
+	  line and a digital PCM bus.
+	  This codec allows to use some of the time slots available on the
+	  PEF2256 PCM bus to transport some audio data.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-soc-pef2256.
+
 config SND_SOC_RK3328
 	tristate "Rockchip RK3328 audio CODEC"
 	select REGMAP_MMIO

index 20b388b77f1f..11bd66d46f7b 100644
@@ -188,6 +188,7 @@ snd-soc-pcm512x-objs := pcm512x.o
 snd-soc-pcm512x-i2c-objs := pcm512x-i2c.o
 snd-soc-pcm512x-spi-objs := pcm512x-spi.o
 snd-soc-peb2466-objs := peb2466.o
+snd-soc-pef2256-objs := pef2256-codec.o
 snd-soc-rk3328-objs := rk3328_codec.o
 snd-soc-rk817-objs := rk817_codec.o
 snd-soc-rl6231-objs := rl6231.o

@@ -551,6 +552,7 @@ obj-$(CONFIG_SND_SOC_PCM512x)	+= snd-soc-pcm512x.o
 obj-$(CONFIG_SND_SOC_PCM512x_I2C)	+= snd-soc-pcm512x-i2c.o
 obj-$(CONFIG_SND_SOC_PCM512x_SPI)	+= snd-soc-pcm512x-spi.o
 obj-$(CONFIG_SND_SOC_PEB2466)	+= snd-soc-peb2466.o
+obj-$(CONFIG_SND_SOC_PEF2256)	+= snd-soc-pef2256.o
 obj-$(CONFIG_SND_SOC_RK3328)	+= snd-soc-rk3328.o
 obj-$(CONFIG_SND_SOC_RK817)	+= snd-soc-rk817.o
 obj-$(CONFIG_SND_SOC_RL6231)	+= snd-soc-rl6231.o

index fcb69242cd19..a17c85648f6f 100644
@@ -11651,6 +11651,15 @@ S:	Maintained
 F:	arch/mips/lantiq
 F:	drivers/soc/lantiq
 
+LANTIQ PEF2256 DRIVER
+M:	Herve Codina <[email protected]>
+S:	Maintained
+F:	Documentation/ABI/testing/sysfs-bus-platform-devices-pef2256
+F:	Documentation/devicetree/bindings/mfd/lantiq,pef2256.yaml
+F:	drivers/mfd/pef2256.c
+F:	include/linux/mfd/pef2256.h
+F:	sound/soc/codecs/pef2256-codec.c
+
 LASI 53c700 driver for PARISC
 M:	"James E.J. Bottomley" <[email protected]>
 L:	[email protected]

new file mode 100644
index 000000000000..e2c2959a21f0
@@ -0,0 +1,270 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/lantiq,pef2256.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lantiq PEF2256
+
+maintainers:
+  - Herve Codina <[email protected]>
+
+description:
+  The Lantiq PEF2256, also known as Infineon PEF2256 or FALC56, is a framer and
+  line interface component designed to fulfill all required interfacing between
+  an analog E1/T1/J1 line and the digital PCM system highway/H.100 bus.
+
+properties:
+  compatible:
+    items:
+      - const: lantiq,pef2256
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Master clock
+      - description: Receive System Clock
+      - description: Transmit System Clock
+
+  clock-names:
+    items:
+      - const: mclk
+      - const: sclkr
+      - const: sclkx
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    description:
+      GPIO used to reset the device.
+    maxItems: 1
+
+  pinctrl:
+    $ref: /schemas/pinctrl/pinctrl.yaml#
+
+    patternProperties:
+      '-pins$':
+        type: object
+        $ref: /schemas/pinctrl/pincfg-node.yaml#
+
+        properties:
+          pins:
+            enum: [ RPA, RPB, RPC, RPD, XPA, XPB, XPC, XPD ]
+
+          function:
+            enum: [ SYPR, RFM, RFMB, RSIGM, RSIG, DLR, FREEZE, RFSP, LOS,
+                    SYPX, XFMS, XSIG, TCLK, XMFB, XSIGM, DLX, XCLK, XLT,
+                    GPI, GPOH, GPOL ]
+
+        additionalProperties: false
+
+        required:
+          - pins
+          - function
+
+    additionalProperties: false
+
+  lantiq,line-interface:
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [e1, t1j1]
+    default: e1
+    description: |
+      The line interface type
+        - e1: E1 line
+        - t1j1: T1/J1 line
+
+  lantiq,frame-format:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      The line interface frame format.
+
+  lantiq,data-rate-bps:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [2048000, 4096000, 8192000, 16384000]
+    default: 2048000
+    description:
+      Data rate (bit per seconds) on the system highway.
+
+  lantiq,clock-falling-edge:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Data is sent on falling edge of the clock (and received on the rising
+      edge). If 'clock-falling-edge' is not present, data is sent on the
+      rising edge (and received on the falling edge).
+
+  lantiq,channel-phase:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3, 4, 5, 6, 7]
+    default: 0
+    description:
+      The pef2256 delivers a full frame (32 8bit time-slots in E1 and 24 8bit
+      time-slots 8 8bit signaling in E1/J1) every 125us. This lead to a data
+      rate of 2048000 bit/s. When lantiq,data-rate-bps is more than 2048000
+      bit/s, the data (all 32 8bit) present in the frame are interleave with
+      unused time-slots. The lantiq,channel-phase property allows to set the
+      correct alignment of the interleave mechanism.
+      For instance, suppose lantiq,data-rate-bps = 8192000 (ie 4*2048000), and
+      lantiq,channel-phase = 2, the interleave schema with unused time-slots
+      (nu) and used time-slots (XX) for TSi is
+        nu nu XX nu nu nu XX nu nu nu XX nu
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+      With lantiq,data-rate-bps = 8192000, and lantiq,channel-phase = 1, the
+      interleave schema is
+        nu XX nu nu nu XX nu nu nu XX nu nu
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+      With lantiq,data-rate-bps = 4096000 (ie 2*2048000), and
+      lantiq,channel-phase = 1, the interleave schema is
+        nu    XX    nu    XX    nu    XX
+        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
+
+  lantiq,subordinate:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If present, the pef2256 works in subordinate mode. In this mode it
+      synchronizes on line interface clock signals. Otherwise, it synchronizes
+      on internal clocks.
+
+patternProperties:
+  '^codec([0-9]|[1-2][0-9]|3[0-1])?$':
+    type: object
+    $ref: /schemas/sound/dai-common.yaml
+    description:
+      Codec provided by the pef2256. This codec allows to use some of the PCM
+      system highway time-slots as audio channels to transport audio data over
+      the E1/T1/J1 lines.
+      The time-slots used by the codec must be set and so, the properties
+      'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
+      'dai-tdm-slot-rx-mask' must be present in the sound card node for
+      sub-nodes that involve the codec. The codec uses 8bit time-slots.
+      'dai-tdm-tdm-slot-with' must be set to 8.
+      The tx and rx masks define the pef2256 time-slots assigned to the codec.
+
+    properties:
+      compatible:
+        const: lantiq,pef2256-codec
+
+      '#sound-dai-cells':
+        const: 0
+
+    required:
+      - compatible
+      - '#sound-dai-cells'
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+allOf:
+  - if:
+      properties:
+        lantiq,line-interface:
+          contains:
+            const: e1
+    then:
+      properties:
+        lantiq,frame-format:
+          enum: [doubleframe, crc4-multiframe, auto-multiframe]
+          default: doubleframe
+          description: |
+            The E1 line interface frame format
+              - doubleframe: Doubleframe format
+              - crc4-multiframe: CRC4 multiframe format
+              - auto-multiframe: CRC4 multiframe format with interworking
+                                 capabilities (ITU-T G.706 Annex B)
+
+    else:
+      # T1/J1 line
+      properties:
+        lantiq,frame-format:
+          enum: [4frame, 12frame, 24frame, 72frame]
+          default: 12frame
+          description: |
+            The T1/J1 line interface frame format
+              - 4frame: 4-frame multiframe format (F4)
+              - 12frame: 12-frame multiframe format (F12, D3/4)
+              - 24frame: 24-frame multiframe format (ESF)
+              - 72frame: 72-frame multiframe format (F72, remote switch mode)
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    framer@2000000 {
+      compatible = "lantiq,pef2256", "simple-mfd";
+      reg = <0x2000000 0x100>;
+      interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
+      interrupt-parent = <&intc>;
+      clocks = <&clk_mclk>, <&clk_sclkr>, <&clk_sclkx>;
+      clock-names = "mclk", "sclkr", "sclkx";
+      reset-gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+      lantiq,data-rate-bps = <4096000>;
+
+      pinctrl {
+        pef2256_rpa_sypr: rpa-pins {
+          pins = "RPA";
+          function = "SYPR";
+        };
+        pef2256_xpa_sypx: xpa-pins {
+          pins = "XPA";
+          function = "SYPX";
+        };
+      };
+
+      pef2256_codec0: codec0 {
+        compatible = "lantiq,pef2256-codec";
+        #sound-dai-cells = <0>;
+        sound-name-prefix = "PEF2256_0";
+      };
+
+      pef2256_codec1: codec1 {
+        compatible = "lantiq,pef2256-codec";
+        #sound-dai-cells = <0>;
+        sound-name-prefix = "PEF2256_1";
+      };
+    };
+
+    sound {
+      compatible = "simple-audio-card";
+      #address-cells = <1>;
+      #size-cells = <0>;
+      simple-audio-card,dai-link@0 { /* CPU DAI1 - pef2256 codec 1 */
+        reg = <0>;
+        cpu {
+          sound-dai = <&cpu_dai1>;
+        };
+        codec {
+          sound-dai = <&pef2256_codec0>;
+          dai-tdm-slot-num = <4>;
+          dai-tdm-slot-width = <8>;
+          /* TS 1, 2, 3, 4 */
+          dai-tdm-slot-tx-mask = <0 1 1 1 1>;
+          dai-tdm-slot-rx-mask = <0 1 1 1 1>;
+        };
+      };
+      simple-audio-card,dai-link@1 { /* CPU DAI2 - pef2256 codec 2 */
+        reg = <1>;
+        cpu {
+          sound-dai = <&cpu_dai2>;
+        };
+        codec {
+          sound-dai = <&pef2256_codec1>;
+          dai-tdm-slot-num = <4>;
+          dai-tdm-slot-width = <8>;
+          /* TS 5, 6, 7, 8 */
+          dai-tdm-slot-tx-mask = <0 0 0 0 0 1 1 1 1>;
+          dai-tdm-slot-rx-mask = <0 0 0 0 0 1 1 1 1>;
+        };
+      };
+    };

index fcc141e067b9..74c3750d21e4 100644
@@ -1063,6 +1063,23 @@ config PCF50633_GPIO
 	  Say yes here if you want to include support GPIO for pins on
 	  the PCF50633 chip.
 
+config MFD_PEF2256
+	tristate "Lantiq PEF2256 (FALC56) framer"
+	depends on OF
+	select PINCTRL
+	select PINMUX
+	select GENERIC_PINCONF
+	help
+	  This option enables support for the Lantiq PEF2256 framer, also known
+	  as FALC56. This framer and its line interface component is designed
+	  to fulfill all required interfacing between analog E1/T1/J1 lines and
+	  the digital PCM system highway.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pef2256.
+
 config MFD_PM8XXX
 	tristate "Qualcomm PM8xxx PMIC chips driver"
 	depends on (ARM || HEXAGON || COMPILE_TEST)

index 2f6c89d1e277..b2bb6e6a141c 100644
@@ -195,6 +195,7 @@ obj-$(CONFIG_MFD_SI476X_CORE)	+= si476x-core.o
 
 obj-$(CONFIG_MFD_CS5535)	+= cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)	+= omap-usb-host.o omap-usb-tll.o
+obj-$(CONFIG_MFD_PEF2256)	+= pef2256.o
 obj-$(CONFIG_MFD_PM8XXX) 	+= qcom-pm8xxx.o ssbi.o
 obj-$(CONFIG_MFD_QCOM_RPM)	+= qcom_rpm.o
 obj-$(CONFIG_MFD_SPMI_PMIC)	+= qcom-spmi-pmic.o

new file mode 100644
index 000000000000..95ba1ae55daf
@@ -0,0 +1,12 @@
+What:		/sys/bus/platform/devices/*.pef2256/subordinate
+KernelVersion:	6.4
+Contact:	Herve Codina <[email protected]>
+Description:
+		(RW) Controls whether the PEF2256 works as subordinate or main
+		device mode.
+
+		- 0: main device mode
+		- 1: subordinate mode
+
+		In subordinate device mode it synchronizes on line interface
+		clock signals. Otherwise, it synchronizes on internal clocks.

index 0be061953e9a..4f78da914fc7 100644
@@ -168,6 +168,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_PCM512x_I2C
 	imply SND_SOC_PCM512x_SPI
 	imply SND_SOC_PEB2466
+	imply SND_SOC_PEF2256
 	imply SND_SOC_RK3328
 	imply SND_SOC_RK817
 	imply SND_SOC_RT274

@@ -1252,6 +1253,19 @@ config SND_SOC_PEB2466
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-soc-peb2466.
 
+config SND_SOC_PEF2256
+	tristate "Lantiq PEF2256 codec"
+	depends on MFD_PEF2256
+	help
+	  Enable support for the Lantiq PEF2256 (FALC56) codec.
+	  The PEF2256 is a framer and line interface between analog E1/T1/J1
+	  line and a digital PCM bus.
+	  This codec allows to use some of the time slots available on the
+	  PEF2256 PCM bus to transport some audio data.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-soc-pef2256.
+
 config SND_SOC_RK3328
 	tristate "Rockchip RK3328 audio CODEC"
 	select REGMAP_MMIO

index 20b388b77f1f..11bd66d46f7b 100644
@@ -188,6 +188,7 @@ snd-soc-pcm512x-objs := pcm512x.o
 snd-soc-pcm512x-i2c-objs := pcm512x-i2c.o
 snd-soc-pcm512x-spi-objs := pcm512x-spi.o
 snd-soc-peb2466-objs := peb2466.o
+snd-soc-pef2256-objs := pef2256-codec.o
 snd-soc-rk3328-objs := rk3328_codec.o
 snd-soc-rk817-objs := rk817_codec.o
 snd-soc-rl6231-objs := rl6231.o

@@ -551,6 +552,7 @@ obj-$(CONFIG_SND_SOC_PCM512x)	+= snd-soc-pcm512x.o
 obj-$(CONFIG_SND_SOC_PCM512x_I2C)	+= snd-soc-pcm512x-i2c.o
 obj-$(CONFIG_SND_SOC_PCM512x_SPI)	+= snd-soc-pcm512x-spi.o
 obj-$(CONFIG_SND_SOC_PEB2466)	+= snd-soc-peb2466.o
+obj-$(CONFIG_SND_SOC_PEF2256)	+= snd-soc-pef2256.o
 obj-$(CONFIG_SND_SOC_RK3328)	+= snd-soc-rk3328.o
 obj-$(CONFIG_SND_SOC_RK817)	+= snd-soc-rk817.o
 obj-$(CONFIG_SND_SOC_RL6231)	+= snd-soc-rl6231.o

index fcb69242cd19..a17c85648f6f 100644
@@ -11651,6 +11651,15 @@ S:	Maintained
 F:	arch/mips/lantiq
 F:	drivers/soc/lantiq
 
+LANTIQ PEF2256 DRIVER
+M:	Herve Codina <[email protected]>
+S:	Maintained
+F:	Documentation/ABI/testing/sysfs-bus-platform-devices-pef2256
+F:	Documentation/devicetree/bindings/mfd/lantiq,pef2256.yaml
+F:	drivers/mfd/pef2256.c
+F:	include/linux/mfd/pef2256.h
+F:	sound/soc/codecs/pef2256-codec.c
+
 LASI 53c700 driver for PARISC
 M:	"James E.J. Bottomley" <[email protected]>
 L:	[email protected]