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SubjectRe: [PATCH] reset: hisilicon: add a polarity cell for reset line specifier
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On 2016/11/25 11:45, Jiancheng Xue wrote:
>
> On 2016/11/21 10:58, Jiancheng Xue wrote:
>> Hi Philipp,
>>
>>> On 2016/11/15 18:43, Philipp Zabel wrote:
>>>> Hi Jiancheng,
>>>>
>>>> Am Dienstag, den 15.11.2016, 15:09 +0800 schrieb Jiancheng Xue:
>>>>> Add a polarity cell for reset line specifier. If the reset line
>>>>> is asserted when the register bit is 1, the polarity is
>>>>> normal. Otherwise, it is inverted.
>>>>>
>>>>> Signed-off-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
>>>>> ---
>>> Thank you very much for replying so soon.
>>>
>>> Please allow me to decribe the reason why this patch exists first.
>>> All bits in the reset controller were designed to be active-high.
>>> But in a recent chip only one bit was implemented to be active-low :(
>>>
>>>>> .../devicetree/bindings/clock/hisi-crg.txt | 11 ++++---
>>>>> arch/arm/boot/dts/hi3519.dtsi | 2 +-
>>>>> drivers/clk/hisilicon/reset.c | 36 ++++++++++++++++------
>>>>> 3 files changed, 33 insertions(+), 16 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/clock/hisi-crg.txt b/Documentation/devicetree/bindings/clock/hisi-crg.txt
>>>>> index e3919b6..fcbb4f3 100644
>>>>> --- a/Documentation/devicetree/bindings/clock/hisi-crg.txt
>>>>> +++ b/Documentation/devicetree/bindings/clock/hisi-crg.txt
>>>>> @@ -25,19 +25,20 @@ to specify the clock which they consume.
>>>>>
>>>>> All these identifier could be found in <dt-bindings/clock/hi3519-clock.h>.
>>>>>
>>>>> -- #reset-cells: should be 2.
>>>>> +- #reset-cells: should be 3.
>>>>>
>>>>> A reset signal can be controlled by writing a bit register in the CRG module.
>>>>> -The reset specifier consists of two cells. The first cell represents the
>>>>> +The reset specifier consists of three cells. The first cell represents the
>>>>> register offset relative to the base address. The second cell represents the
>>>>> -bit index in the register.
>>>>> +bit index in the register. The third cell represents the polarity of the reset
>>>>> +line (0 for normal, 1 for inverted).
>>>>
>> #reset-cells: Should be 2 if compatilbe string is "hisilicon,hi3519-crg". Should be 3 otherwise.
>> A reset signal can be controlled by writing a bit register in the CRG module.
>> The reset specifier consists of two or three cells. The first cell represents the
>> register offset relative to the base address. The second cell represents the
>> bit index in the register.The third cell represents the polarity of the reset
>> line (0 for active-high, 1 for active-low).
>>
>> If I change the binding like this, can it be accepted?
>>
> Hi Philipp,
>
> Could you give me more suggestions about this? If you really don't like changing the
> reset-cells like this, I can modify the patch according to your suggestions.
> Thank you.
>

I'll drop this patch and use "ti,syscon-reset" instead to resolve the polarity issue. Thanks.

Regards,
Jiancheng




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