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

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Date:   Tue, 13 Oct 2020 08:29:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        sernia.zhou@...mail.com
Subject: Re: [PATCH 1/1] dt-bindings: clock: Add new OST support for the
 upcoming new driver.

On Thu, Oct 08, 2020 at 02:14:07AM +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.

Wrap lines at <80 characters.

> 
> I'm sure that exchanging the ABI values of OST_CLK_PERCPU_TIMER and OST_CLK_GLOBAL_TIMER
> will not affect the existing related drivers and the SoCs whitch using these drivers, so
> we should be able to exchange them safely.

Why exactly is this okay?

> 
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@...mail.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
>  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
>