From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Date: Tue, 9 Jun 2015 19:23:21 +0530
Subject: [U-Boot] [PATCH RFT] gpio: vybrid: Fix up setting output value
	in vybrid_gpio_direction_output
In-Reply-To: <CAFRkauCV4ThvrHUNZOJ=tJK4sBrMC1wwjr+TGpBtjtLYy-wy2Q@mail.gmail.com>
References: <1433841302.4157.1.camel@ingics.com>	<5576E2EF.6080400@toradex.com>
 <CAFRkauCV4ThvrHUNZOJ=tJK4sBrMC1wwjr+TGpBtjtLYy-wy2Q@mail.gmail.com>
Message-ID: <5576EFD1.50504@toradex.com>
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On 06/09/2015 06:49 PM, Axel Lin wrote:
> 2015-06-09 20:58 GMT+08:00 Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>:
>> Hello Axel,
>>
>> On 06/09/2015 02:45 PM, Axel Lin wrote:
>>>
>>> Pass correct gpio argument to gpio_set_value().
>>> The calcualation of gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
>>> is required for calling imx_iomux_gpio_* functions so move them close to
>>> improve readability.
>>>
>>> Signed-off-by: Axel Lin <axel.lin@ingics.com>
>>> ---
>>> Hi Bhuvanchandra,
>>> I think current code does not pass correct gpio argument to
>>> gpio_set_value()
>>> in vybrid_gpio_direction_output(). It only works if gpios->chip is 0.
>>> I don't have the h/w to test, can you double check this?
>>
>> gpio_set_value() needs the actual gpio number to be passed not the gpio
>> offset of gpio chip.
>
> Are you sure?
> Please take a look at gpio_get_value()/gpio_set_value() implement in
> drivers/gpio/gpio-uclass.c.
Yes,

Toggling GPIO_34 => GPIO_01 2nd instance, with debug prints:

Colibri VFxx # gpio toggle 34
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: vybrid_gpio_direction_output: gpio(before calculation): 2
DEBUG: vybrid_gpio_direction_output: gpio(after calculation): 34
DEBUG: gpio_set_value: gpio: 34
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: dm_gpio_set_value: gpio_offset: 2
gpio: pin 34 (gpio 34) value is 0
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
Colibri VFxx # gpio toggle 34
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: vybrid_gpio_direction_output: gpio(before calculation): 2
DEBUG: vybrid_gpio_direction_output: gpio(after calculation): 34
DEBUG: gpio_set_value: gpio: 34
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
DEBUG: dm_gpio_set_value: desc_offset: 2
gpio: pin 34 (gpio 34) value is 1
DEBUG: gpio_to_device: gpio: 34
DEBUG: gpio_to_device: desc_offset: 2
>

Best regards,
Bhuvan