The patch adds the DT bindings for enabling and tuning spread spectrum
clocking generation.
Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
---
(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
+
+ fsl,ssc-modrate-percent:
+ description:
+ The percentage values of modulation rate for each clock
+ supporting spread spectrum.
+ minItems: 7
+ maxItems: 10
+
+ fsl,ssc-modmethod:
+ $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+ description:
+ The modulation techniques for each clock supporting spread
+ spectrum.
+ minItems: 7
+ maxItems: 10
+ items:
+ enum:
+ - ""
+ - 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
clock-names:
items:
@@ -95,20 +131,49 @@ allOf:
- const: clk_ext2
- const: clk_ext3
- const: clk_ext4
+ - const: audio_pll1
+ - const: audio_pll2
+ - const: dram_pll
+ - const: video_pll
additionalProperties: false
examples:
# Clock Control Module node:
- |
+ #include <dt-bindings/clock/imx8mm-clock.h>
+
clock-controller@30380000 {
compatible = "fsl,imx8mm-ccm";
reg = <0x30380000 0x10000>;
#clock-cells = <1>;
clocks = <&osc_32k>, <&osc_24m>, <&clk_ext1>, <&clk_ext2>,
- <&clk_ext3>, <&clk_ext4>;
+ <&clk_ext3>, <&clk_ext4>,
+ <&anatop IMX8MM_ANATOP_AUDIO_PLL1>,
+ <&anatop IMX8MM_ANATOP_AUDIO_PLL1>,
+ <&anatop IMX8MM_ANATOP_DRAM_PLL>,
+ <&anatop IMX8MM_ANATOP_VIDEO_PLL>;
clock-names = "osc_32k", "osc_24m", "clk_ext1", "clk_ext2",
- "clk_ext3", "clk_ext4";
+ "clk_ext3", "clk_ext4", "audio_pll1", "audio_pll2",
+ "dram_pll", "video_pll";
+ fsl,ssc-modfreq-hz = <0>, <0>, <0>, <0>,
+ <0>, <0>,
+ <6818>,
+ <0>,
+ <0>,
+ <2419>;
+ fsl,ssc-modrate-percent = <0>, <0>, <0>, <0>,
+ <0>, <0>,
+ <3>,
+ <0>,
+ <0>,
+ <7>;
+ fsl,ssc-modmethod = "", "", "", "",
+ "", "",
+ "down-spread",
+ "",
+ "",
+ "center-spread";
};
- |
--
2.43.0
