[PATCH v3 0/3] Add support for lan966x flexcom chip-select configuration

[PATCH v3 0/3] Add support for lan966x flexcom chip-select configuration

[Kavyasree Kotagiri]

This patch series converts atmel-flexcom bindings into json-schema format.
Adds support for lan966x flexcom chip-select configurations and its
DT bindings.

v2 -> v3:
 - changed IRQ flag in dt-bindings example.
 - added reg property specific to lan66x which is missed in v2.
 - used goto label for clk_disable in error cases.

v1 -> v2:
 - minor fix in title of dt-bindings.
 - Modified new dt properties usage in atmel,flexcom.yaml.
 - Used GENMASK and macros for maximum allowed values.
 - Use u32 values for flexcom chipselects instead of strings.
 - disable clock in case of errors.

Kavyasree Kotagiri (3):
  dt-bindings: mfd: atmel,flexcom: Convert to json-schema
  dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x
  mfd: atmel-flexcom: Add support for lan966x flexcom chip-select
    configuration

 .../bindings/mfd/atmel,flexcom.yaml           | 174 ++++++++++++++++++
 .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -------
 drivers/mfd/atmel-flexcom.c                   |  94 +++++++++-
 3 files changed, 267 insertions(+), 64 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
 delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

-- 
2.17.1

[PATCH v3 1/3] dt-bindings: mfd: atmel,flexcom: Convert to json-schema

[Kavyasree Kotagiri]

Convert the Atmel flexcom device tree bindings to json schema.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
---
v2 -> v3:
 - used enum for compatible string.
 - changed irq flag to IRQ_TYPE_LEVEL_HIGH in example.
 - fixed dtschema errors.

v1 -> v2:
 - Fix title.

 .../bindings/mfd/atmel,flexcom.yaml           | 103 ++++++++++++++++++
 .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -----------
 2 files changed, 103 insertions(+), 63 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
 delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
new file mode 100644
index 000000000000..cee9c93ce4b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
@@ -0,0 +1,103 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/atmel,flexcom.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel Flexcom (Flexible Serial Communication Unit)
+
+maintainers:
+  - Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
+
+description:
+  The Atmel Flexcom is just a wrapper which embeds a SPI controller,
+  an I2C controller and an USART. Only one function can be used at a
+  time and is chosen at boot time according to the device tree.
+
+properties:
+  compatible:
+    enum: atmel,sama5d2-flexcom
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges:
+    description:
+      One range for the full I/O register region. (including USART,
+      TWI and SPI registers).
+    items:
+      maxItems: 3
+
+  atmel,flexcom-mode:
+    description: |
+      Specifies the flexcom mode as follows:
+      1: USART
+      2: SPI
+      3: I2C.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 3]
+
+patternProperties:
+  "^serial@[0-9a-f]+$":
+    description: See atmel-usart.txt for details of USART bindings.
+    type: object
+
+  "^spi@[0-9a-f]+$":
+    description: See ../spi/spi_atmel.txt for details of SPI bindings.
+    type: object
+
+    properties:
+      compatible:
+        const: atmel,at91rm9200-spi
+
+  "^i2c@[0-9a-f]+$":
+    description: See ../i2c/i2c-at91.txt for details of I2C bindings.
+    type: object
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - atmel,flexcom-mode
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    flx0: flexcom@f8034000 {
+          compatible = "atmel,sama5d2-flexcom";
+          reg = <0xf8034000 0x200>;
+          clocks = <&flx0_clk>;
+          #address-cells = <1>;
+          #size-cells = <1>;
+          ranges = <0x0 0xf8034000 0x800>;
+          atmel,flexcom-mode = <2>;
+
+          spi0: spi@400 {
+                compatible = "atmel,at91rm9200-spi";
+                reg = <0x400 0x200>;
+                interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_flx0_default>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                clocks = <&flx0_clk>;
+                clock-names = "spi_clk";
+                atmel,fifo-size = <32>;
+          };
+    };
+...
diff --git a/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
deleted file mode 100644
index 9d837535637b..000000000000
--- a/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
+++ /dev/null
@@ -1,63 +0,0 @@
-* Device tree bindings for Atmel Flexcom (Flexible Serial Communication Unit)
-
-The Atmel Flexcom is just a wrapper which embeds a SPI controller, an I2C
-controller and an USART. Only one function can be used at a time and is chosen
-at boot time according to the device tree.
-
-Required properties:
-- compatible:		Should be "atmel,sama5d2-flexcom"
-- reg:			Should be the offset/length value for Flexcom dedicated
-			I/O registers (without USART, TWI or SPI registers).
-- clocks:		Should be the Flexcom peripheral clock from PMC.
-- #address-cells:	Should be <1>
-- #size-cells:		Should be <1>
-- ranges:		Should be one range for the full I/O register region
-			(including USART, TWI and SPI registers).
-- atmel,flexcom-mode:	Should be one of the following values:
-			- <1> for USART
-			- <2> for SPI
-			- <3> for I2C
-
-Required child:
-A single available child device of type matching the "atmel,flexcom-mode"
-property.
-
-The phandle provided by the clocks property of the child is the same as one for
-the Flexcom parent.
-
-For other properties, please refer to the documentations of the respective
-device:
-- ../serial/atmel-usart.txt
-- ../spi/spi_atmel.txt
-- ../i2c/i2c-at91.txt
-
-Example:
-
-flexcom@f8034000 {
-	compatible = "atmel,sama5d2-flexcom";
-	reg = <0xf8034000 0x200>;
-	clocks = <&flx0_clk>;
-	#address-cells = <1>;
-	#size-cells = <1>;
-	ranges = <0x0 0xf8034000 0x800>;
-	atmel,flexcom-mode = <2>;
-
-	spi@400 {
-		compatible = "atmel,at91rm9200-spi";
-		reg = <0x400 0x200>;
-		interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_flx0_default>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		clocks = <&flx0_clk>;
-		clock-names = "spi_clk";
-		atmel,fifo-size = <32>;
-
-		flash@0 {
-			compatible = "atmel,at25f512b";
-			reg = <0>;
-			spi-max-frequency = <20000000>;
-		};
-	};
-};
-- 
2.17.1

Re: [PATCH v3 1/3] dt-bindings: mfd: atmel,flexcom: Convert to json-schema

[Rob Herring]

On Sun, 12 Jun 2022 20:56:02 +0530, Kavyasree Kotagiri wrote:
> Convert the Atmel flexcom device tree bindings to json schema.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> ---
> v2 -> v3:
>  - used enum for compatible string.
>  - changed irq flag to IRQ_TYPE_LEVEL_HIGH in example.
>  - fixed dtschema errors.
> 
> v1 -> v2:
>  - Fix title.
> 
>  .../bindings/mfd/atmel,flexcom.yaml           | 103 ++++++++++++++++++
>  .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -----------
>  2 files changed, 103 insertions(+), 63 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml: properties:compatible:enum: 'atmel,sama5d2-flexcom' is not of type 'array'
	from schema $id: http://json-schema.org/draft-07/schema#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml: properties:compatible:enum: 'atmel,sama5d2-flexcom' is not of type 'array'
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml: properties:compatible:enum: 'atmel,sama5d2-flexcom' is not of type 'array'
	from schema $id: http://devicetree.org/meta-schemas/string-array.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml: ignoring, error in schema: properties: compatible: enum
Documentation/devicetree/bindings/mfd/atmel,flexcom.example.dtb:0:0: /example-0/flexcom@f8034000: failed to match any schema with compatible: ['atmel,sama5d2-flexcom']
Documentation/devicetree/bindings/mfd/atmel,flexcom.example.dtb:0:0: /example-0/flexcom@f8034000/spi@400: failed to match any schema with compatible: ['atmel,at91rm9200-spi']

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.

Re: [PATCH v3 1/3] dt-bindings: mfd: atmel,flexcom: Convert to json-schema

[Krzysztof Kozlowski]

On 12/06/2022 08:26, Kavyasree Kotagiri wrote:
> Convert the Atmel flexcom device tree bindings to json schema.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> ---
> v2 -> v3:
>  - used enum for compatible string.
>  - changed irq flag to IRQ_TYPE_LEVEL_HIGH in example.
>  - fixed dtschema errors.
> 
> v1 -> v2:
>  - Fix title.
> 
>  .../bindings/mfd/atmel,flexcom.yaml           | 103 ++++++++++++++++++
>  .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -----------
>  2 files changed, 103 insertions(+), 63 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> new file mode 100644
> index 000000000000..cee9c93ce4b9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/atmel,flexcom.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel Flexcom (Flexible Serial Communication Unit)
> +
> +maintainers:
> +  - Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> +
> +description:
> +  The Atmel Flexcom is just a wrapper which embeds a SPI controller,
> +  an I2C controller and an USART. Only one function can be used at a
> +  time and is chosen at boot time according to the device tree.
> +
> +properties:
> +  compatible:
> +    enum: atmel,sama5d2-flexcom

This is not correct syntax. Use `git grep -C` to find nice examples.


Best regards,
Krzysztof

[PATCH v3 2/3] dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x

[Kavyasree Kotagiri]

LAN966x SoC flexcoms has two optional I/O lines. Namely, CS0 and CS1
in flexcom SPI mode. CTS and RTS in flexcom USART mode. These pins
can be mapped to lan966x FLEXCOM_SHARED[0-20] pins and usage depends on
functions being configured.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
---
v2 -> v3:
 - Add reg property of lan966x missed in v2.

v1 -> v2:
 - Use allOf:if:then for lan966x dt properties

 .../bindings/mfd/atmel,flexcom.yaml           | 75 ++++++++++++++++++-
 1 file changed, 73 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
index cee9c93ce4b9..d9b0fe2b0211 100644
--- a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
+++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
@@ -16,10 +16,13 @@ description:
 
 properties:
   compatible:
-    enum: atmel,sama5d2-flexcom
+    enum:
+      - atmel,sama5d2-flexcom
+      - microchip,lan966x-flexcom
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   clocks:
     maxItems: 1
@@ -46,6 +49,27 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [1, 2, 3]
 
+  microchip,flx-shrd-pins:
+    description: Specify the Flexcom shared pins to be used for flexcom
+      chip-selects.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 20
+
+  microchip,flx-cs:
+    description: Flexcom chip selects. Here, value of '0' represents "cts" line
+      of flexcom USART or "cs0" line of flexcom SPI and value of '1' represents
+      "rts" line of flexcom USART or "cs1" line of flexcom SPI.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 1
+
 patternProperties:
   "^serial@[0-9a-f]+$":
     description: See atmel-usart.txt for details of USART bindings.
@@ -72,6 +96,25 @@ required:
   - ranges
   - atmel,flexcom-mode
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: microchip,lan966x-flexcom
+
+    then:
+      properties:
+        reg:
+          minItems: 2
+          maxItems: 2
+          items:
+            - description: Flexcom base regsiters map
+            - description: Flexcom shared registers map
+      required:
+        - microchip,flx-shrd-pins
+        - microchip,flx-cs
+
 additionalProperties: false
 
 examples:
@@ -100,4 +143,32 @@ examples:
                 atmel,fifo-size = <32>;
           };
     };
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    flx3: flexcom@e0064000 {
+          compatible = "microchip,lan966x-flexcom";
+          reg = <0xe0064000 0x100>,
+                <0xe2004180 0x8>;
+          clocks = <&flx0_clk>;
+          #address-cells = <1>;
+          #size-cells = <1>;
+          ranges = <0x0 0xe0040000 0x800>;
+          atmel,flexcom-mode = <2>;
+          microchip,flx-shrd-pins = <9>;
+          microchip,flx-cs = <0>;
+
+          spi3: spi@400 {
+                compatible = "atmel,at91rm9200-spi";
+                reg = <0x400 0x200>;
+                interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_flx3_default>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                clocks = <&nic_clk>;
+                clock-names = "spi_clk";
+                atmel,fifo-size = <32>;
+          };
+    };
 ...
-- 
2.17.1

Re: [PATCH v3 2/3] dt-bindings: mfd: atmel,flexcom: Add new compatible string for lan966x

[Krzysztof Kozlowski]

On 12/06/2022 08:26, Kavyasree Kotagiri wrote:
> LAN966x SoC flexcoms has two optional I/O lines. Namely, CS0 and CS1
> in flexcom SPI mode. CTS and RTS in flexcom USART mode. These pins
> can be mapped to lan966x FLEXCOM_SHARED[0-20] pins and usage depends on
> functions being configured.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> ---
> v2 -> v3:
>  - Add reg property of lan966x missed in v2.
> 
> v1 -> v2:
>  - Use allOf:if:then for lan966x dt properties
> 
>  .../bindings/mfd/atmel,flexcom.yaml           | 75 ++++++++++++++++++-
>  1 file changed, 73 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> index cee9c93ce4b9..d9b0fe2b0211 100644
> --- a/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> +++ b/Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> @@ -16,10 +16,13 @@ description:
>  
>  properties:
>    compatible:
> -    enum: atmel,sama5d2-flexcom
> +    enum:
> +      - atmel,sama5d2-flexcom
> +      - microchip,lan966x-flexcom

And here you have correct syntax...

>  
>    reg:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
>  
>    clocks:
>      maxItems: 1
> @@ -46,6 +49,27 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      enum: [1, 2, 3]
>  
> +  microchip,flx-shrd-pins:
> +    description: Specify the Flexcom shared pins to be used for flexcom
> +      chip-selects.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      minimum: 0
> +      maximum: 20
> +
> +  microchip,flx-cs:
> +    description: Flexcom chip selects. Here, value of '0' represents "cts" line
> +      of flexcom USART or "cs0" line of flexcom SPI and value of '1' represents
> +      "rts" line of flexcom USART or "cs1" line of flexcom SPI.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      minimum: 0
> +      maximum: 1
> +
>  patternProperties:
>    "^serial@[0-9a-f]+$":
>      description: See atmel-usart.txt for details of USART bindings.
> @@ -72,6 +96,25 @@ required:
>    - ranges
>    - atmel,flexcom-mode
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: microchip,lan966x-flexcom
> +
> +    then:
> +      properties:
> +        reg:
> +          minItems: 2
> +          maxItems: 2

maxItems are not needed here.

> +          items:
> +            - description: Flexcom base regsiters map
> +            - description: Flexcom shared registers map
> +      required:
> +        - microchip,flx-shrd-pins
> +        - microchip,flx-cs

You need "else:" setting reg to maxItems:1 and disallowing the
properties (microchip,flx-cs:false). See for example:
https://elixir.bootlin.com/linux/v5.17-rc2/source/Documentation/devicetree/bindings/media/renesas,vsp1.yaml#L53



Best regards,
Krzysztof

[PATCH v3 3/3] mfd: atmel-flexcom: Add support for lan966x flexcom chip-select configuration

[Kavyasree Kotagiri]

LAN966x SoC have 5 flexcoms. Each flexcom has 2 chip-selects.
For each chip select of each flexcom there is a configuration
register FLEXCOM_SHARED[0-4]:SS_MASK[0-1]. The width of
configuration register is 21 because there are 21 shared pins
on each of which the chip select can be mapped. Each bit of the
register represents a different FLEXCOM_SHARED pin.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
---
v2 -> v3:
 - used goto label for clk_disable in error cases.

v1 -> v2:
 - use GENMASK for mask, macros for maximum allowed values.
 - use u32 values for flexcom chipselects instead of strings.
 - disable clock in case of errors.

 drivers/mfd/atmel-flexcom.c | 94 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 93 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
index 33caa4fba6af..2579c2452655 100644
--- a/drivers/mfd/atmel-flexcom.c
+++ b/drivers/mfd/atmel-flexcom.c
@@ -28,15 +28,68 @@
 #define FLEX_MR_OPMODE(opmode)	(((opmode) << FLEX_MR_OPMODE_OFFSET) &	\
 				 FLEX_MR_OPMODE_MASK)
 
+/* LAN966x flexcom shared register offsets */
+#define FLEX_SHRD_SS_MASK_0	0x0
+#define FLEX_SHRD_SS_MASK_1	0x4
+#define FLEX_SHRD_PIN_MAX	20
+#define FLEX_CS_MAX		1
+#define FLEX_SHRD_MASK		GENMASK(20, 0)
+
+struct atmel_flex_caps {
+	bool has_flx_cs;
+};
+
 struct atmel_flexcom {
 	void __iomem *base;
+	void __iomem *flexcom_shared_base;
 	u32 opmode;
 	struct clk *clk;
 };
 
+static int atmel_flexcom_lan966x_cs_config(struct platform_device *pdev)
+{
+	struct atmel_flexcom *ddata = dev_get_drvdata(&pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
+	u32 flx_shrd_pins[2], flx_cs[2], val;
+	int err, i, count;
+
+	count = of_property_count_u32_elems(np, "microchip,flx-shrd-pins");
+	if (count <= 0 || count > 2) {
+		dev_err(&pdev->dev, "Invalid %s property (%d)\n", "flx-shrd-pins",
+				count);
+		return -EINVAL;
+	}
+
+	err = of_property_read_u32_array(np, "microchip,flx-shrd-pins", flx_shrd_pins, count);
+	if (err)
+		return err;
+
+	err = of_property_read_u32_array(np, "microchip,flx-cs", flx_cs, count);
+	if (err)
+		return err;
+
+	for (i = 0; i < count; i++) {
+		if (flx_shrd_pins[i] > FLEX_SHRD_PIN_MAX)
+			return -EINVAL;
+
+		if (flx_cs[i] > FLEX_CS_MAX)
+			return -EINVAL;
+
+		val = ~(1 << flx_shrd_pins[i]) & FLEX_SHRD_MASK;
+
+		if (flx_cs[i] == 0)
+			writel(val, ddata->flexcom_shared_base + FLEX_SHRD_SS_MASK_0);
+		else
+			writel(val, ddata->flexcom_shared_base + FLEX_SHRD_SS_MASK_1);
+	}
+
+	return 0;
+}
+
 static int atmel_flexcom_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	const struct atmel_flex_caps *caps;
 	struct resource *res;
 	struct atmel_flexcom *ddata;
 	int err;
@@ -76,13 +129,52 @@ static int atmel_flexcom_probe(struct platform_device *pdev)
 	 */
 	writel(FLEX_MR_OPMODE(ddata->opmode), ddata->base + FLEX_MR);
 
+	caps = of_device_get_match_data(&pdev->dev);
+	if (!caps) {
+		dev_err(&pdev->dev, "Could not retrieve flexcom caps\n");
+		err = -EINVAL;
+		goto clk_disable;
+	}
+
+	if (caps->has_flx_cs) {
+		ddata->flexcom_shared_base = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
+		if (IS_ERR(ddata->flexcom_shared_base)) {
+			err = dev_err_probe(&pdev->dev,
+					PTR_ERR(ddata->flexcom_shared_base),
+					"failed to get flexcom shared base address\n");
+			goto clk_disable;
+		}
+
+		err = atmel_flexcom_lan966x_cs_config(pdev);
+		if (err)
+			goto clk_disable;
+	}
+
+clk_disable:
 	clk_disable_unprepare(ddata->clk);
+	if (err)
+		return err;
 
 	return devm_of_platform_populate(&pdev->dev);
 }
 
+static const struct atmel_flex_caps atmel_flexcom_caps = {};
+
+static const struct atmel_flex_caps lan966x_flexcom_caps = {
+	.has_flx_cs = true,
+};
+
 static const struct of_device_id atmel_flexcom_of_match[] = {
-	{ .compatible = "atmel,sama5d2-flexcom" },
+	{
+		.compatible = "atmel,sama5d2-flexcom",
+		.data = &atmel_flexcom_caps,
+	},
+
+	{
+		.compatible = "microchip,lan966x-flexcom",
+		.data = &lan966x_flexcom_caps,
+	},
+
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
-- 
2.17.1