On 11/03/2014 08:44 AM, Roger Quadros wrote:
> On 11/03/2014 04:30 PM, Nishanth Menon wrote:
>> On 12:09-20141103, Roger Quadros wrote:
>>> For PIN_OUTPUT_PULLUP and PIN_OUTPUT_PULLDOWN we must not set the
>>> PULL_DIS bit which disables the PULLs.
>>>
>>> PULL_ENA is a 0 and using it in an OR operation is a NOP, so don't
>>> use it in the PIN_OUTPUT_PULLUP/DOWN macros.
>>>
>>> Fixes: 23d9cec07c58 ("pinctrl: dra: dt-bindings: Fix pull enable/disable")
>>>
>>> Signed-off-by: Roger Quadros <rogerq@xxxxxx>
>>> ---
>>> include/dt-bindings/pinctrl/dra.h | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/include/dt-bindings/pinctrl/dra.h b/include/dt-bindings/pinctrl/dra.h
>>> index 3d33794..7448edf 100644
>>> --- a/include/dt-bindings/pinctrl/dra.h
>>> +++ b/include/dt-bindings/pinctrl/dra.h
>>> @@ -40,8 +40,8 @@
>>>
>>> /* Active pin states */
>>> #define PIN_OUTPUT (0 | PULL_DIS)
>>> -#define PIN_OUTPUT_PULLUP (PIN_OUTPUT | PULL_ENA | PULL_UP)
>>> -#define PIN_OUTPUT_PULLDOWN (PIN_OUTPUT | PULL_ENA)
>>> +#define PIN_OUTPUT_PULLUP (PULL_UP)
>>> +#define PIN_OUTPUT_PULLDOWN (0)
>>> #define PIN_INPUT (INPUT_EN | PULL_DIS)
>>> #define PIN_INPUT_SLEW (INPUT_EN | SLEWCONTROL)
>>> #define PIN_INPUT_PULLUP (PULL_ENA | INPUT_EN | PULL_UP)
>>
>> You are right, we do have an issue with using PIN_OUTPUT along with
>> remaining setting.
>>
>> For a moment, I wondered why input was not impacted - then I realized
>> that INPUT_EN was being used instead of PIN_INPUT - following that
>> convention. With the intent being explicitly using macros that
>> clearly indicate what each setting combination is is, how about the
>> following?
>>
>>
>> diff --git a/include/dt-bindings/pinctrl/dra.h b/include/dt-bindings/pinctrl/dra.h
>> index 3d33794..d4037e7 100644
>> --- a/include/dt-bindings/pinctrl/dra.h
>> +++ b/include/dt-bindings/pinctrl/dra.h
>> @@ -34,14 +34,15 @@
>> #define PULL_DIS (1 << 16)
>> #define PULL_UP (1 << 17)
>> #define INPUT_EN (1 << 18)
>> +#define OUTPUT_EN (0 << 18)
>> #define SLEWCONTROL (1 << 19)
>> #define WAKEUP_EN (1 << 24)
>> #define WAKEUP_EVENT (1 << 25)
>>
>> /* Active pin states */
>> -#define PIN_OUTPUT (0 | PULL_DIS)
>> -#define PIN_OUTPUT_PULLUP (PIN_OUTPUT | PULL_ENA | PULL_UP)
>> -#define PIN_OUTPUT_PULLDOWN (PIN_OUTPUT | PULL_ENA)
>> +#define PIN_OUTPUT (OUTPUT_EN | PULL_DIS)
>> +#define PIN_OUTPUT_PULLUP (OUTPUT_EN | PULL_ENA | PULL_UP)
>> +#define PIN_OUTPUT_PULLDOWN (OUTPUT_EN | PULL_ENA)
>
> To me it adds more confusion and this change is a NOP as we're ORing 0 here
> with OUTPUT_EN.
look at this this way:
PIN_OUTPUT_PULLDOWN (OUTPUT_EN | PULL_ENA)
should probably trigger in mind (what about PULLDOWN?)
PIN_OUTPUT_PULLDOWN (OUTPUT_EN | PULL_ENA | PULL_DOWN)
then verify values of each OUTPUT_EN -> 0 in bit 18, ok, etc.
if we ensure that PIN_XX macros use just the basic primitives, it is
easier to prevent the mistake like the one I made. the other option of
not defining macros whose values are 0 implies that the reviewer has
to recheck against trm to ensure all the right "1" bits are set.
just my view here.
>
>> #define PIN_INPUT (INPUT_EN | PULL_DIS)
>> #define PIN_INPUT_SLEW (INPUT_EN | SLEWCONTROL)
>> #define PIN_INPUT_PULLUP (PULL_ENA | INPUT_EN | PULL_UP)
>>
>
> cheers,
> -roger
>
--
Regards,
Nishanth Menon
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