Re: [PATCH 3/3] dt-bindings: serial: Convert Samsung UART bindings to json-schema

On Tue, Oct 15, 2019 at 02:40:06PM -0500, Rob Herring wrote:

On Fri, Oct 04, 2019 at 05:14:14PM +0200, Krzysztof Kozlowski wrote:

quoted

Convert Samsung S3C/S5P/Exynos Serial/UART bindings to DT schema format
using json-schema.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 .../bindings/mfd/samsung,exynos5433-lpass.txt |   2 +-
 .../bindings/serial/samsung_uart.txt          |  58 -------
 .../bindings/serial/samsung_uart.yaml         | 148 ++++++++++++++++++
 3 files changed, 149 insertions(+), 59 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/serial/samsung_uart.txt
 create mode 100644 Documentation/devicetree/bindings/serial/samsung_uart.yaml

diff --git a/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
index d759da606f75..30ea27c3936d 100644
--- a/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
+++ b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt

@@ -18,7 +18,7 @@ an optional sub-node. For "samsung,exynos5433-lpass" compatible this includes:
 UART, SLIMBUS, PCM, I2S, DMAC, Timers 0...4, VIC, WDT 0...1 devices.
 
 Bindings of the sub-nodes are described in:
-  ../serial/samsung_uart.txt
+  ../serial/samsung_uart.yaml
   ../sound/samsung-i2s.txt
   ../dma/arm-pl330.txt
 

diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.txt b/Documentation/devicetree/bindings/serial/samsung_uart.txt
deleted file mode 100644
index e85f37ec33f0..000000000000
--- a/Documentation/devicetree/bindings/serial/samsung_uart.txt
+++ /dev/null

@@ -1,58 +0,0 @@
-* Samsung's UART Controller
-
-The Samsung's UART controller is used for interfacing SoC with serial
-communicaion devices.
-
-Required properties:
-- compatible: should be one of following:
-  - "samsung,exynos4210-uart" -  Exynos4210 SoC,
-  - "samsung,s3c2410-uart" - compatible with ports present on S3C2410 SoC,
-  - "samsung,s3c2412-uart" - compatible with ports present on S3C2412 SoC,
-  - "samsung,s3c2440-uart" - compatible with ports present on S3C2440 SoC,
-  - "samsung,s3c6400-uart" - compatible with ports present on S3C6400 SoC,
-  - "samsung,s5pv210-uart" - compatible with ports present on S5PV210 SoC.
-
-- reg: base physical address of the controller and length of memory mapped
-  region.
-
-- interrupts: a single interrupt signal to SoC interrupt controller,
-  according to interrupt bindings documentation [1].
-
-- clock-names: input names of clocks used by the controller:
-  - "uart" - controller bus clock,
-  - "clk_uart_baudN" - Nth baud base clock input (N = 0, 1, ...),
-    according to SoC User's Manual (only N = 0 is allowedfor SoCs without
-    internal baud clock mux).
-- clocks: phandles and specifiers for all clocks specified in "clock-names"
-  property, in the same order, according to clock bindings documentation [2].
-
-[1] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Optional properties:
-- samsung,uart-fifosize: The fifo size supported by the UART channel
-
-Note: Each Samsung UART should have an alias correctly numbered in the
-"aliases" node, according to serialN format, where N is the port number
-(non-negative decimal integer) as specified by User's Manual of respective
-SoC.
-
-Example:
-	aliases {
-		serial0 = &uart0;
-		serial1 = &uart1;
-		serial2 = &uart2;
-	};
-
-Example:
-	uart1: serial@7f005400 {
-		compatible = "samsung,s3c6400-uart";
-		reg = <0x7f005400 0x100>;
-		interrupt-parent = <&vic1>;
-		interrupts = <6>;
-		clock-names = "uart", "clk_uart_baud2",
-				"clk_uart_baud3";
-		clocks = <&clocks PCLK_UART1>, <&clocks PCLK_UART1>,
-				<&clocks SCLK_UART>;
-		samsung,uart-fifosize = <16>;
-	};

diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
new file mode 100644
index 000000000000..276bea1c231a
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml

@@ -0,0 +1,148 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/samsung_uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung S3C, S5P and Exynos SoC UART Controller
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@kernel.org>
+  - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+description: |+
+  Each Samsung UART should have an alias correctly numbered in the "aliases"
+  node, according to serialN format, where N is the port number (non-negative
+  decimal integer) as specified by User's Manual of respective SoC.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - samsung,s3c2410-uart
+          - samsung,s3c2412-uart
+          - samsung,s3c2440-uart
+          - samsung,s3c6400-uart
+          - samsung,s5pv210-uart
+          - samsung,exynos4210-uart
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    maxItems: 5
+
+  clock-names:
+    description: |
+      List of clock names:
+        - "uart" - controller bus clock,
+        - "clk_uart_baudN" - Nth baud base clock input (N = 0, 1, ...).

Kind of redundant to list this here.

quoted

+      N = 0 is allowed for SoCs without internal baud clock mux.

You can add a description with the item:

items:
  - pattern: '^clk_uart_baud[0-3]$'
    description: N = 0 is allowed for SoCs without internal baud clock mux.

This caused error:
properties:clock-names:items:1: Additional properties are not allowed ('description' was unexpected)
../Documentation/devicetree/bindings/Makefile:12: recipe for target 'Documentation/devicetree/bindings/serial/samsung_uart.example.dts' failed

I applied rest of comments. Thanks for review!

Best regards,
Krzysztof