linux-kernel - Re: [PATCH v3 1/2] dt-bindings: timer: Add Ingenic X1000 OST bindings.

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Message-Id: <LT6RCQ.V5ANBLLSA4OD3@crapouillou.net>
Date:   Tue, 30 Jun 2020 21:15:21 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <zhouyanjie@...yeetech.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        daniel.lezcano@...aro.org, tglx@...utronix.de, robh+dt@...nel.org,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, yanfei.li@...enic.com,
        sernia.zhou@...mail.com, zhenwenjin@...il.com
Subject: Re: [PATCH v3 1/2] dt-bindings: timer: Add Ingenic X1000 OST
 bindings.

Hi Zhou,

Le mer. 1 juil. 2020 à 1:15, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> Add the OST bindings for the X10000 SoC from Ingenic.
> 
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@...mail.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
> 
> Notes:
>     v1->v2:
>     No change.
> 
>     v2->v3:
>     Fix wrong parameters in "clocks".
> 
>  .../devicetree/bindings/timer/ingenic,ost.yaml     | 61 
> ++++++++++++++++++++++
>  include/dt-bindings/clock/ingenic,ost.h            | 12 +++++

Please name them ingenic,sysost.yaml and ingenic,sysost.h, to 
differenciate with the OST that is in the JZ SoCs.

>  2 files changed, 73 insertions(+)
>  create mode 100644 
> Documentation/devicetree/bindings/timer/ingenic,ost.yaml
>  create mode 100644 include/dt-bindings/clock/ingenic,ost.h
> 
> diff --git a/Documentation/devicetree/bindings/timer/ingenic,ost.yaml 
> b/Documentation/devicetree/bindings/timer/ingenic,ost.yaml
> new file mode 100644
> index 000000000000..459dd3d161c2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/ingenic,ost.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/ingenic,ost.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for SYSOST in Ingenic XBurst family SoCs
> +
> +maintainers:
> +  - 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> +
> +description:
> +  The SYSOST in an Ingenic SoC provides one 64bit timer for 
> clocksource
> +  and one or more than one 32bit timers for clockevent.

"and one or more than one" -> "and one or more"

> +
> +properties:
> +  compatible:
> +    oneOf:
> +
> +      - description: SYSOST in Ingenic XBurst family SoCs

XBurst is the name of the CPU, not a SoC family, so you would just 
write 'Ingenic SoCs'. But just drop the description alltogether, it 
does not add anything valuable.

> +        enum:
> +          - ingenic,x1000-ost
> +          - ingenic,x2000-ost

You have "ingenic,x2000-ost" as a compatible string, but your driver 
(in patch [2/2]) only handles the first compatible string. Either they 
are different, in this case the driver should handle both, or they work 
the same, and in the case the "ingenic,x2000-ost" string should use 
"ingenic,x1000-ost" as a fallback string.

Cheers,
-Paul

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: ost
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - "#clock-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/x1000-cgu.h>
> +
> +    ost: timer@...00000 {
> +    		compatible = "ingenic,x1000-ost";
> +    		reg = <0x12000000 0x3c>;
> +
> +    		#clock-cells = <1>;
> +
> +    		clocks = <&cgu X1000_CLK_OST>;
> +    		clock-names = "ost";
> +
> +    		interrupt-parent = <&cpuintc>;
> +    		interrupts = <3>;
> +    	};
> +...
> diff --git a/include/dt-bindings/clock/ingenic,ost.h 
> b/include/dt-bindings/clock/ingenic,ost.h
> new file mode 100644
> index 000000000000..9ac88e90babf
> --- /dev/null
> +++ b/include/dt-bindings/clock/ingenic,ost.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * This header provides clock numbers for the ingenic,tcu DT binding.
> + */
> +
> +#ifndef __DT_BINDINGS_CLOCK_INGENIC_OST_H__
> +#define __DT_BINDINGS_CLOCK_INGENIC_OST_H__
> +
> +#define OST_CLK_PERCPU_TIMER	0
> +#define OST_CLK_GLOBAL_TIMER	1
> +
> +#endif /* __DT_BINDINGS_CLOCK_INGENIC_OST_H__ */
> --
> 2.11.0
>