Re: [PATCH v5 15/20] dt-bindings: clock: imx8m-clock: support spread spectrum clocking

The patch adds the DT bindings for enabling and tuning spread spectrum
clocking generation.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

(no changes since v4)

Changes in v4:
- Drop "fsl,ssc-clocks" property. The other added properties now refer
  to the clock list.
- Updated minItems and maxItems of
  - clocks
  - clock-names
  - fsl,ssc-modfreq-hz
  - fsl,ssc-modrate-percent
  - fsl,ssc-modmethod
- Updated the dts examples

Changes in v3:
- Added in v3
- The dt-bindings have been moved from fsl,imx8m-anatop.yaml to
  imx8m-clock.yaml. The anatop device (fsl,imx8m-anatop.yaml) is
  indeed more or less a syscon, so it represents a memory area
  accessible by ccm (imx8m-clock.yaml) to setup the PLLs.

Changes in v2:
- Add "allOf:" and place it after "required:" block, like in the
  example schema.
- Move the properties definition to the top-level.
- Drop unit types as requested by the "make dt_binding_check" command.

 .../bindings/clock/imx8m-clock.yaml           | 77 +++++++++++++++++--
 1 file changed, 71 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/imx8m-clock.yaml b/Documentation/devicetree/bindings/clock/imx8m-clock.yaml
index c643d4a81478..83036f6d2274 100644
--- a/Documentation/devicetree/bindings/clock/imx8m-clock.yaml
+++ b/Documentation/devicetree/bindings/clock/imx8m-clock.yaml

@@ -29,12 +29,12 @@ properties:
     maxItems: 2
 
   clocks:
-    minItems: 6
-    maxItems: 7
+    minItems: 7
+    maxItems: 10

 
   clock-names:
-    minItems: 6
-    maxItems: 7
+    minItems: 7
+    maxItems: 10
 
   '#clock-cells':
     const: 1

@@ -43,6 +43,34 @@ properties:
       ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx8m-clock.h
       for the full list of i.MX8M clock IDs.
 
+  fsl,ssc-modfreq-hz:
+    description:
+      The values of modulation frequency (Hz unit) for each clock
+      supporting spread spectrum.
+    minItems: 7
+    maxItems: 10

+        - down-spread
+        - up-spread
+        - center-spread
+
 required:
   - compatible
   - reg

@@ -76,6 +104,10 @@ allOf:
             - const: clk_ext2
             - const: clk_ext3
             - const: clk_ext4
+        fsl,ssc-modfreq-hz: false
+        fsl,ssc-modrate-percent: false
+        fsl,ssc-modmethod: false
+
     else:
       properties:
         clocks:

@@ -86,6 +118,10 @@ allOf:
             - description: ext2 clock input
             - description: ext3 clock input
             - description: ext4 clock input
+            - description: audio1 PLL input
+            - description: audio2 PLL input
+            - description: dram PLL input
+            - description: video PLL input