[v5,1/7] dt-bindings: clock: Add StarFive JH7110 PLL clock generator

Commit Message

Xingyu Wu June 13, 2023, 12:58 p.m. UTC

Add bindings for the PLL clock generator on the JH7110 RISC-V SoC.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Xingyu Wu <[e-mail]>
---
 .../bindings/clock/starfive,jh7110-pll.yaml   | 46 +++++++++++++++++++
 .../dt-bindings/clock/starfive,jh7110-crg.h   |  6 +++
 2 files changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml

Comments

Conor Dooley June 13, 2023, 7:06 p.m. UTC | #1

Hey Xingyu,

Couple nitpick items to be fixed if you resubmit.

On Tue, Jun 13, 2023 at 08:58:46PM +0800, Xingyu Wu wrote:
> +  This PLL are high speed, low jitter frequency synthesizers in JH7110.

nit: These PLLs are

> +  Each PLL clocks work in integer mode or fraction mode by some dividers,
> +  and the configuration registers and dividers are set in several syscon
> +  registers. So pll node should be a child of SYS-SYSCON node.

nit: Each PLL can work in integer or fractional mode, with controlled by
configuration registers in the sys syscon.

> +  The formula for calculating frequency is that,

nit: s/ that//

> +examples:
> +  - |
> +    pll-clock-controller {

nit: s/pll-//

> diff --git a/include/dt-bindings/clock/starfive,jh7110-crg.h b/include/dt-bindings/clock/starfive,jh7110-crg.h
> index 06257bfd9ac1..086a6ddcf380 100644
> --- a/include/dt-bindings/clock/starfive,jh7110-crg.h
> +++ b/include/dt-bindings/clock/starfive,jh7110-crg.h
> @@ -6,6 +6,12 @@
>  #ifndef __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
>  #define __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
>  
> +/* PLL clocks */
> +#define JH7110_CLK_PLL0_OUT			0
> +#define JH7110_CLK_PLL1_OUT			1
> +#define JH7110_CLK_PLL2_OUT			2
> +#define JH7110_PLLCLK_END			3

Please CC me on the patches fixing this for U-Boot :)

Nitpicking aside, which only needs to be fixed if you end up submitting
a new version for other reasons,
Reviewed-by: Conor Dooley <[e-mail]>

Thanks,
Conor.

Patch

diff --git a/Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml b/Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml
new file mode 100644
index 000000000000..8aa8c7b8e42f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml
@@ -0,0 +1,46 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/starfive,jh7110-pll.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 PLL Clock Generator
+
+description:
+  This PLL are high speed, low jitter frequency synthesizers in JH7110.
+  Each PLL clocks work in integer mode or fraction mode by some dividers,
+  and the configuration registers and dividers are set in several syscon
+  registers. So pll node should be a child of SYS-SYSCON node.
+  The formula for calculating frequency is that,
+  Fvco = Fref * (NI + NF) / M / Q1
+
+maintainers:
+  - Xingyu Wu <[e-mail]>
+
+properties:
+  compatible:
+    const: starfive,jh7110-pll
+
+  clocks:
+    maxItems: 1
+    description: Main Oscillator (24 MHz)
+
+  '#clock-cells':
+    const: 1
+    description:
+      See <dt-bindings/clock/starfive,jh7110-crg.h> for valid indices.
+
+required:
+  - compatible
+  - clocks
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    pll-clock-controller {
+      compatible = "starfive,jh7110-pll";
+      clocks = <&osc>;
+      #clock-cells = <1>;
+    };
diff --git a/include/dt-bindings/clock/starfive,jh7110-crg.h b/include/dt-bindings/clock/starfive,jh7110-crg.h
index 06257bfd9ac1..086a6ddcf380 100644
--- a/include/dt-bindings/clock/starfive,jh7110-crg.h
+++ b/include/dt-bindings/clock/starfive,jh7110-crg.h
@@ -6,6 +6,12 @@ 
 #ifndef __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
 #define __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
 
+/* PLL clocks */
+#define JH7110_CLK_PLL0_OUT			0
+#define JH7110_CLK_PLL1_OUT			1
+#define JH7110_CLK_PLL2_OUT			2
+#define JH7110_PLLCLK_END			3
+
 /* SYSCRG clocks */
 #define JH7110_SYSCLK_CPU_ROOT			0
 #define JH7110_SYSCLK_CPU_CORE			1