[PATCH v9 0/3] Add support for lan966x flexcom chip-select configuration

[PATCH v9 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.

v8 -> v9:
 - Use full schema path for i2c bindings.

v7 -> v8:
 - Added back patternProperties for child nodes.
 - Changed compatible string to microchip,lan9668-flexcom.

v6 -> v7:
 - Change filename to atmel,sama5d2-flexcom.yaml
 - Add #address-cells, #size-cells to flexcom node - Fixed warnings.

v5 -> v6:
 - Removed spi node from example as suggested by Rob and
   also pattern properties(spi dt-bindings conversion to yaml patch is under review).
   https://patchwork.kernel.org/project/linux-arm-kernel/patch/20220629125804.137099-1-sergiu.moga@microchip.com/
   Once this is accepted, I will add back spi example through new patch.

v4 -> v5:
 - Fix indentations of DT example.
 - Fix dt-schema errors - removed minItems, maxItems for allOf:if:then
   "reg" property as it is not required.

v3 -> v4:
 - Fix dtschema errors.
 - Add a condition to flexcom chip-selects configuration as chip-select
   lines are optional.

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: Convert atmel-flexcom to json-schema
  dt-bindings: mfd: atmel,sama5d2-flexcom: Add new compatible string for
    lan966x
  mfd: atmel-flexcom: Add support for lan966x flexcom chip-select
    configuration

 .../bindings/mfd/atmel,sama5d2-flexcom.yaml   | 155 ++++++++++++++++++
 .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -------
 drivers/mfd/atmel-flexcom.c                   |  94 ++++++++++-
 3 files changed, 248 insertions(+), 64 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
 delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

-- 
2.25.1


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[PATCH v9 1/3] dt-bindings: mfd: Convert atmel-flexcom to json-schema

[Kavyasree Kotagiri]

Convert the Atmel flexcom device tree bindings to json schema.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
v8 -> v9:
 - Use full schema path for i2c bindings.

Changing reference to SPI yaml bindings is covered in below patch series:
https://lore.kernel.org/linux-arm-kernel/20220913142205.162399-6-sergiu.moga@microchip.com/
https://lore.kernel.org/linux-arm-kernel/dad37ca0-a44b-59ec-0be9-fb121de12244@linaro.org/

v7 -> v8:
 - Added back patternProperties for child nodes.

v6 -> v7:
 - Change filename to atmel,sama5d2-flexcom.yaml
 - Add #address-cells, #size-cells to flexcom node - Fixed warnings.

v5 -> v6:
 - Removed spi node from example as suggested by Rob and
   also pattern properties(spi dt-bindings conversion to yaml patch is under review).
   Once that is accepted, I will add back spi example through new patch.

v4 -> v5:
 - Fixed indentations.

v3 -> v4:
 - Corrected format of enum used for compatible string.

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,sama5d2-flexcom.yaml   | 92 +++++++++++++++++++
 .../devicetree/bindings/mfd/atmel-flexcom.txt | 63 -------------
 2 files changed, 92 insertions(+), 63 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
 delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

diff --git a/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
new file mode 100644
index 000000000000..f28522cd987a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/atmel,sama5d2-flexcom.yaml#
+$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.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 3]
+
+patternProperties:
+  "^serial@[0-9a-f]+$":
+    type: object
+    description:
+      Child node describing USART. See atmel-usart.txt for details
+      of USART bindings.
+
+  "^spi@[0-9a-f]+$":
+    type: object
+    description:
+      Child node describing SPI. See ../spi/spi_atmel.txt for details
+      of SPI bindings.
+
+  "^i2c@[0-9a-f]+$":
+    $ref: /schemas/i2c/atmel,at91sam-i2c.yaml
+    description:
+      Child node describing I2C.
+
+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>;
+    };
+...
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>;
-		};
-	};
-};
-- 
2.25.1


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[PATCH v9 2/3] dt-bindings: mfd: atmel,sama5d2-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>
Reviewed-by: Rob Herring <robh@kernel.org>
---
v8 -> v9:
 - No changes.

v7 -> v8:
 - Changed compatible string to microchip,lan9668-flexcom.

v6 -> v7:
 - Add #address-cells, #size-cells to flx3 example.

v5 -> v6:
 - Removed spi node from flx3 example.

v4 -> v5:
 - Fixed indentations and dt-schema errors.
 - No errors seen with 'make dt_binding_check'.

v3 -> v4:
 - Added else condition to allOf:if:then.

v2 -> v3:
 - Add reg property of lan966x missed in v2.

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

 .../bindings/mfd/atmel,sama5d2-flexcom.yaml   | 65 ++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
index f28522cd987a..0c80f4e98c54 100644
--- a/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
+++ b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
@@ -18,9 +18,11 @@ properties:
   compatible:
     enum:
       - atmel,sama5d2-flexcom
+      - microchip,lan9668-flexcom
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   clocks:
     maxItems: 1
@@ -47,6 +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.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 1
+
 patternProperties:
   "^serial@[0-9a-f]+$":
     type: object
@@ -74,6 +97,31 @@ required:
   - ranges
   - atmel,flexcom-mode
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: microchip,lan9668-flexcom
+
+    then:
+      properties:
+        reg:
+          items:
+            - description: Flexcom base registers map
+            - description: Flexcom shared registers map
+      required:
+        - microchip,flx-shrd-pins
+        - microchip,flx-cs
+
+    else:
+      properties:
+        reg:
+          items:
+            - description: Flexcom base registers map
+        microchip,flx-shrd-pins: false
+        microchip,flx-cs: false
+
 additionalProperties: false
 
 examples:
@@ -89,4 +137,19 @@ examples:
         ranges = <0x0 0xf8034000 0x800>;
         atmel,flexcom-mode = <2>;
     };
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    flx3: flexcom@e0064000 {
+        compatible = "microchip,lan9668-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>;
+    };
 ...
-- 
2.25.1


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[PATCH v9 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
which are optional I/O lines. 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>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
v8 -> v9:
 - No changes.

v7 -> v8:
 - Changed compatible string to microchip,lan9668-flexcom.

v6 -> v7:
 - No changes.

v5 -> v6:
 - No changes.

v4 -> v5:
 - No changes.

v3 -> v4:
 - Add condition for a flexcom whether to configure chip-select lines
   or not, based on "microchip,flx-shrd-pins" property existence because
   chip-select lines are optional.

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..92ea15d5fd72 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 && of_property_read_bool(np, "microchip,flx-shrd-pins")) {
+		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,lan9668-flexcom",
+		.data = &lan966x_flexcom_caps,
+	},
+
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
-- 
2.25.1


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RE: [PATCH v9 1/3] dt-bindings: mfd: Convert atmel-flexcom to json-schema

[Kavyasree.Kotagiri]

> Convert the Atmel flexcom device tree bindings to json schema.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
> v8 -> v9:
>  - Use full schema path for i2c bindings.
> 
> Changing reference to SPI yaml bindings is covered in below patch series:
> https://lore.kernel.org/linux-arm-kernel/20220913142205.162399-6-
> sergiu.moga@microchip.com/
> https://lore.kernel.org/linux-arm-kernel/dad37ca0-a44b-59ec-0be9-
> fb121de12244@linaro.org/
> 
> v7 -> v8:
>  - Added back patternProperties for child nodes.
> 
> v6 -> v7:
>  - Change filename to atmel,sama5d2-flexcom.yaml
>  - Add #address-cells, #size-cells to flexcom node - Fixed warnings.
> 
> v5 -> v6:
>  - Removed spi node from example as suggested by Rob and
>    also pattern properties(spi dt-bindings conversion to yaml patch is under
> review).
>    Once that is accepted, I will add back spi example through new patch.
> 
> v4 -> v5:
>  - Fixed indentations.
> 
> v3 -> v4:
>  - Corrected format of enum used for compatible string.
> 
> 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,sama5d2-flexcom.yaml   | 92 +++++++++++++++++++
>  .../devicetree/bindings/mfd/atmel-flexcom.txt | 63 -------------
>  2 files changed, 92 insertions(+), 63 deletions(-)
>  create mode 100644
> Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-
> flexcom.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
> flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
> flexcom.yaml
> new file mode 100644
> index 000000000000..f28522cd987a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
> flexcom.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/atmel,sama5d2-flexcom.yaml#
> +$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.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [1, 2, 3]
> +
> +patternProperties:
> +  "^serial@[0-9a-f]+$":
> +    type: object
> +    description:
> +      Child node describing USART. See atmel-usart.txt for details
> +      of USART bindings.
> +
> +  "^spi@[0-9a-f]+$":
> +    type: object
> +    description:
> +      Child node describing SPI. See ../spi/spi_atmel.txt for details
> +      of SPI bindings.
> +
> +  "^i2c@[0-9a-f]+$":
> +    $ref: /schemas/i2c/atmel,at91sam-i2c.yaml


Hi Krzysztof,

I added full schema path for i2c bindings in v9. Please let me know your comments.

Thanks,
Kavya

> +    description:
> +      Child node describing I2C.
> +
> +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>;
> +    };
> +...
> 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>;
> -		};
> -	};
> -};
> --
> 2.25.1


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RE: [PATCH v9 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.
> 
> v8 -> v9:
>  - Use full schema path for i2c bindings.
> 
Hi Rob & Krzysztof,

Please let me know your comments on v9 patch series.

Thanks,
Kavya

> v7 -> v8:
>  - Added back patternProperties for child nodes.
>  - Changed compatible string to microchip,lan9668-flexcom.
> 
> v6 -> v7:
>  - Change filename to atmel,sama5d2-flexcom.yaml
>  - Add #address-cells, #size-cells to flexcom node - Fixed warnings.
> 
> v5 -> v6:
>  - Removed spi node from example as suggested by Rob and
>    also pattern properties(spi dt-bindings conversion to yaml patch is under
> review).
>    https://patchwork.kernel.org/project/linux-arm-
> kernel/patch/20220629125804.137099-1-sergiu.moga@microchip.com/
>    Once this is accepted, I will add back spi example through new patch.
> 
> v4 -> v5:
>  - Fix indentations of DT example.
>  - Fix dt-schema errors - removed minItems, maxItems for allOf:if:then
>    "reg" property as it is not required.
> 
> v3 -> v4:
>  - Fix dtschema errors.
>  - Add a condition to flexcom chip-selects configuration as chip-select
>    lines are optional.
> 
> 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: Convert atmel-flexcom to json-schema
>   dt-bindings: mfd: atmel,sama5d2-flexcom: Add new compatible string for
>     lan966x
>   mfd: atmel-flexcom: Add support for lan966x flexcom chip-select
>     configuration
> 
>  .../bindings/mfd/atmel,sama5d2-flexcom.yaml   | 155 ++++++++++++++++++
>  .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -------
>  drivers/mfd/atmel-flexcom.c                   |  94 ++++++++++-
>  3 files changed, 248 insertions(+), 64 deletions(-)
>  create mode 100644
> Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-
> flexcom.txt
> 
> --
> 2.25.1


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Re: [PATCH v9 1/3] dt-bindings: mfd: Convert atmel-flexcom to json-schema

[Krzysztof Kozlowski]

On 19/09/2022 07:27, Kavyasree.Kotagiri@microchip.com wrote:
>> Convert the Atmel flexcom device tree bindings to json schema.
>>
>> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
>> Reviewed-by: Rob Herring <robh@kernel.org>
>> ---
>> v8 -> v9:
>>  - Use full schema path for i2c bindings.
>>
>> Changing reference to SPI yaml bindings is covered in below patch series:
>> https://lore.kernel.org/linux-arm-kernel/20220913142205.162399-6-
>> sergiu.moga@microchip.com/
>> https://lore.kernel.org/linux-arm-kernel/dad37ca0-a44b-59ec-0be9-
>> fb121de12244@linaro.org/
>>
>> v7 -> v8:
>>  - Added back patternProperties for child nodes.
>>
>> v6 -> v7:
>>  - Change filename to atmel,sama5d2-flexcom.yaml
>>  - Add #address-cells, #size-cells to flexcom node - Fixed warnings.
>>
>> v5 -> v6:
>>  - Removed spi node from example as suggested by Rob and
>>    also pattern properties(spi dt-bindings conversion to yaml patch is under
>> review).
>>    Once that is accepted, I will add back spi example through new patch.
>>
>> v4 -> v5:
>>  - Fixed indentations.
>>
>> v3 -> v4:
>>  - Corrected format of enum used for compatible string.
>>
>> 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,sama5d2-flexcom.yaml   | 92 +++++++++++++++++++
>>  .../devicetree/bindings/mfd/atmel-flexcom.txt | 63 -------------
>>  2 files changed, 92 insertions(+), 63 deletions(-)
>>  create mode 100644
>> Documentation/devicetree/bindings/mfd/atmel,sama5d2-flexcom.yaml
>>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-
>> flexcom.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
>> flexcom.yaml b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
>> flexcom.yaml
>> new file mode 100644
>> index 000000000000..f28522cd987a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/atmel,sama5d2-
>> flexcom.yaml
>> @@ -0,0 +1,92 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mfd/atmel,sama5d2-flexcom.yaml#
>> +$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.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [1, 2, 3]
>> +
>> +patternProperties:
>> +  "^serial@[0-9a-f]+$":
>> +    type: object
>> +    description:
>> +      Child node describing USART. See atmel-usart.txt for details
>> +      of USART bindings.
>> +
>> +  "^spi@[0-9a-f]+$":
>> +    type: object
>> +    description:
>> +      Child node describing SPI. See ../spi/spi_atmel.txt for details
>> +      of SPI bindings.
>> +
>> +  "^i2c@[0-9a-f]+$":
>> +    $ref: /schemas/i2c/atmel,at91sam-i2c.yaml
> 
> 
> Hi Krzysztof,
> 
> I added full schema path for i2c bindings in v9. Please let me know your comments.
> 

You sent the patch on 16th, pinged on 19th. Wait around two weeks before
pinging.

You got here Rob's review, what is missing? Why do you ping us?

Best regards,
Krzysztof


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Re: [PATCH v9 1/3] dt-bindings: mfd: Convert atmel-flexcom to json-schema

[Krzysztof Kozlowski]

On 16/09/2022 09:57, Kavyasree Kotagiri wrote:
> Convert the Atmel flexcom device tree bindings to json schema.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
> v8 -> v9:
>  - Use full schema path for i2c bindings.
> 
> Changing reference to SPI yaml bindings is covered in below patch series:
> https://lore.kernel.org/linux-arm-kernel/20220913142205.162399-6-sergiu.moga@microchip.com/
> https://lore.kernel.org/linux-arm-kernel/dad37ca0-a44b-59ec-0be9-fb121de12244@linaro.org/
> 


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof


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Re: [PATCH v9 3/3] mfd: atmel-flexcom: Add support for lan966x flexcom chip-select configuration

[Lee Jones]

On Fri, 16 Sep 2022, Kavyasree Kotagiri wrote:

> LAN966x SoC have 5 flexcoms. Each flexcom has 2 chip-selects
> which are optional I/O lines. 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>
> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> ---
> v8 -> v9:
>  - No changes.
> 
> v7 -> v8:
>  - Changed compatible string to microchip,lan9668-flexcom.
> 
> v6 -> v7:
>  - No changes.
> 
> v5 -> v6:
>  - No changes.
> 
> v4 -> v5:
>  - No changes.
> 
> v3 -> v4:
>  - Add condition for a flexcom whether to configure chip-select lines
>    or not, based on "microchip,flx-shrd-pins" property existence because
>    chip-select lines are optional.
> 
> 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..92ea15d5fd72 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

MASK_0 isn't very forthcoming.  What *is* MASK_0 the mask of?

> +#define FLEX_SHRD_SS_MASK_1	0x4

What is SS?

> +#define FLEX_SHRD_PIN_MAX	20
> +#define FLEX_CS_MAX		1
> +#define FLEX_SHRD_MASK		GENMASK(20, 0)
> +
>  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",

Sure, but how about telling the user why it's invalid.

> +				count);

Why the '\n' here?  It's not consistent with the rest of the code.

> +		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;

BIT()?

> +		if (flx_cs[i] == 0)

Please define the magic '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 && of_property_read_bool(np, "microchip,flx-shrd-pins")) {

Is using an array of ints as a bool valid / good practise?

> +		ddata->flexcom_shared_base = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);

Can the magic '1' be defined?

> +		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;
> +	}

All of this new code looks like it's related to the CS logic.

If that's the case, why not encapsulate it all into
atmel_flexcom_lan966x_cs_config()?

> +clk_disable:
>  	clk_disable_unprepare(ddata->clk);
> +	if (err)
> +		return err;
>  
>  	return devm_of_platform_populate(&pdev->dev);
>  }


> +struct atmel_flex_caps {
> +	bool has_flx_cs;
> +};
> +
> +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,lan9668-flexcom",
> +		.data = &lan966x_flexcom_caps,
> +	},
> +

This a lot of infrastructure for no clear gain.  Why can't we use the
caps if they are present and ignore them if they're not?  That would
simplify a great deal of this.

>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);

-- 
Lee Jones [李琼斯]

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