linux-kernel - Re: [PATCH v2 1/1] dt-bindings: timer: Add new OST support for the upcoming new driver.

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Message-ID: <20201026131324.GA7627@bogus>
Date:   Mon, 26 Oct 2020 08:13:24 -0500
From:   Rob Herring <robh@...nel.org>
To:     周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/1] dt-bindings: timer: Add new OST support for the
 upcoming new driver.

On Sat, Oct 17, 2020 at 12:56:02AM +0800, 周琰杰 (Zhou Yanjie) wrote:
> The new OST has one global timer and two or four percpu timers, so there
> will be three combinations in the upcoming new OST driver: the original
> GLOBAL_TIMER + PERCPU_TIMER, the new GLOBAL_TIMER + PERCPU_TIMER0/1 and
> GLOBAL_TIMER + PERCPU_TIMER0/1/2/3, For this, add the macro definition
> about OST_CLK_PERCPU_TIMER0/1/2/3. And in order to ensure that all the
> combinations work normally, the original ABI values of OST_CLK_PERCPU_TIMER
> and OST_CLK_GLOBAL_TIMER need to be exchanged to ensure that in any
> combinations, the clock can be registered (by calling clk_hw_register())
> from index 0.

You need to state why breaking the ABI is okay.

> 
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@...mail.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
> 
> Notes:
>     v1->v2:
>     Rewrite the commit message so that each line is less than 80 characters.
> 
>  include/dt-bindings/clock/ingenic,sysost.h | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/include/dt-bindings/clock/ingenic,sysost.h b/include/dt-bindings/clock/ingenic,sysost.h
> index 9ac88e90babf..063791b01ab3 100644
> --- a/include/dt-bindings/clock/ingenic,sysost.h
> +++ b/include/dt-bindings/clock/ingenic,sysost.h
> @@ -1,12 +1,16 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  /*
> - * This header provides clock numbers for the ingenic,tcu DT binding.
> + * This header provides clock numbers for the Ingenic OST 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
> +#define OST_CLK_PERCPU_TIMER	1
> +#define OST_CLK_GLOBAL_TIMER	0
> +#define OST_CLK_PERCPU_TIMER0	1
> +#define OST_CLK_PERCPU_TIMER1	2
> +#define OST_CLK_PERCPU_TIMER2	3
> +#define OST_CLK_PERCPU_TIMER3	4
>  
>  #endif /* __DT_BINDINGS_CLOCK_INGENIC_OST_H__ */
> -- 
> 2.11.0
>