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SubjectRe: [PATCH 1/1] dt-bindings: clock: Add new OST support for the upcoming new driver.
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Hi Rob,

在 2020/10/13 下午9:29, Rob Herring 写道:
> 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.


Sorry, I will fix it in the next version.


>
>> 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?


These definitions are currently only used in two places, one is when
using "assigned-clocks" to configure the clock in the DTS file; the
other is when registering the clock in the sysost driver. When
exchanging the values of "OST_CLK_PERCPU_TIMER" and
"OST_CLK_GLOBAL_TIMER", the corresponding values will be changed
synchronously when the clock is driven to register and when the clock is
configured through "assigned-clocks". Therefore, there is no situation
that causes the wrong clock to the configured. And it has been tested on
X1000 and X1000 and X1830 SoCs, all working fine.

I'm sorry because I didn't think carefully when writing this header
file, and caused the current trouble.


Thanks and best regards!


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

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