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

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Date:   Mon, 26 Oct 2020 22:36:39 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Rob Herring <robh@...nel.org>
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.

Hi Rob,

在 2020/10/26 下午9:13, Rob Herring 写道:
> 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.


Sorry, I did not understand correctly before, I will add it to the 
commit message in the next version.


Thanks and best regards!


>> 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
>>