[PATCH v4 10/16] dm: gpio: Add a way to update flags

[Patrick DELAUNAY]

On 2/9/21 5:28 AM, Simon Glass wrote:
> Hi Patrick,
>
> On Mon, 8 Feb 2021 at 10:33, Patrick DELAUNAY
> <patrick.delaunay at foss.st.com> wrote:
>> Hi Simon,
>>
>> 2 minor remarks,
>>
>> On 2/5/21 5:22 AM, Simon Glass wrote:
>>> It is convenient to be able to adjust some of the flags for a GPIO while
>>> leaving others alone. Add a function for this.
>>>
>>> Update dm_gpio_set_dir_flags() to make use of this.
>>>
>>> Also update dm_gpio_set_value() to use this also, since this allows the
>>> open-drain / open-source features to be implemented directly in the
>>> driver, rather than using the uclass workaround.
>>>
>>> Update the sandbox tests accordingly. This involves a lot of changes to
>>> dm_test_gpio_opendrain_opensource() since we no-longer have the direciion
>>> being reported differently depending on the open drain/open source flags.
>>>
>>> Also update the STM32 drivers to let the uclass handle the active low/high
>>> logic.
>>>
>>> Drop the GPIOD_FLAGS_OUTPUT() macro which is no-longer used.
>>>
>>> Signed-off-by: Simon Glass <sjg at chromium.org>
>>> ---
>>>
>>> Changes in v4:
>>> - Update dm_gpio_set_dir_flags() to clear direction flags first
>>>
>>> Changes in v3:
>>> - Incorporate GPIOD_FLAGS_OUTPUT() changes from Patrick Delaunay
>>>
>>>    drivers/gpio/gpio-uclass.c      |  75 ++++++++++++++----
>>>    drivers/gpio/stm32_gpio.c       |   3 +-
>>>    drivers/pinctrl/pinctrl-stmfx.c |   5 +-
>>>    include/asm-generic/gpio.h      |  31 ++++++--
>>>    test/dm/gpio.c                  | 132 ++++++++++++++++++++++++++++----
>>>    5 files changed, 203 insertions(+), 43 deletions(-)
>> (...)
>>
>>> diff --git a/drivers/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
>>> index c2d7046c0dd..125c237551c 100644
>>> --- a/drivers/gpio/stm32_gpio.c
>>> +++ b/drivers/gpio/stm32_gpio.c
>>> @@ -203,12 +203,13 @@ static int stm32_gpio_set_flags(struct udevice *dev, unsigned int offset,
>>>                return idx;
>>>
>>>        if (flags & GPIOD_IS_OUT) {
>>> -             int value = GPIOD_FLAGS_OUTPUT(flags);
>>> +             bool value = flags & GPIOD_IS_OUT_ACTIVE;
>> here the bool variable valeu can be 0 or GPIOD_IS_OUT_ACTIVE = BIT(4),
>> so it should have
>>
>> + bool value = !!(flags & GPIOD_IS_OUT_ACTIVE);
>>
>> or
>>
>> + int value = flags & GPIOD_IS_OUT_ACTIVE;
>>
>> PS: not functional impact as
>>
>> #define BSRR_BIT(gpio_pin, value)    BIT((gpio_pin) + (value ? 0 : 16))
>>
>>>                if (flags & GPIOD_OPEN_DRAIN)
>>>                        stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
>>>                else
>>>                        stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
>>> +
>>>                stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
>>>                writel(BSRR_BIT(idx, value), &regs->bsrr);
>>>
>>> diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
>>> index 8ddbc3dc281..711b1a5d8c4 100644
>>> --- a/drivers/pinctrl/pinctrl-stmfx.c
>>> +++ b/drivers/pinctrl/pinctrl-stmfx.c
>>> @@ -169,6 +169,8 @@ static int stmfx_gpio_set_flags(struct udevice *dev, unsigned int offset,
>>>        int ret = -ENOTSUPP;
>>>
>>>        if (flags & GPIOD_IS_OUT) {
>>> +             bool value = flags & GPIOD_IS_OUT_ACTIVE;
>>> +
>>
>> same here
>>
>> +               int value = flags & GPIOD_IS_OUT_ACTIVE;
>> or
>> +               bool value = !!(flags & GPIOD_IS_OUT_ACTIVE);
> The bool type should do this automatically. I tested this and it seems
> to do the right thing.
>
I confirmed that it is working, forget my remarks.

for information: I tested it in stm32MP157C-DK2 board (with gcc 9.2)....


After check, it is my old habit / coding rule, when the bool type

don't exist in C (it was a typedef to int)

but, since C++ introducing a proper bool type,

the cast to 'bool' is enough with current compilers .

>
> Regards,
> SImon


Reviewed-by: Patrick Delaunay <patrick.delaunay at foss.st.com>

Tested-by: Patrick Delaunay <patrick.delaunay at foss.st.com>


Regards