Re: [PATCH] i2c: QUP based bus driver for Qualcomm MSM chipsets

[Trilok Soni <tsoni-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Hi Ken,

> 
>>
>>> +
>>> +    if (!pdata->msm_i2c_config_gpio) {
>>> +        dev_err(&pdev->dev, "config_gpio function not initialized\n");
>>> +        ret = -ENOSYS;
>>> +        goto err_config_failed;
>>> +    }
>>
>> I don't agree here. What if I do all the gpio configuration from the bootloader itself,
>> because I know that the device I am working on is production device and don't change
>> its configuration, then why I should provide the pdata hooks from the board files?
> 
> The reason that this hook is required is so that the driver can enable and disable the GPIOs as needed (although we currently only enable them).
> 
>>
>> Please also specify what are the operations we are doing in the msm_i2c_config_gpio?
> 
> Takes ownership of the GPIOs that are needed and assigns the ownership to the i2c controller.  The drive strength is also set.

Right, so due to these reasons I prefer not to have __must__ have check for pdata->msm_i2c_config_gpio hook's unavailability. It
might happen that some of the systems do all these ownership and pad muxing into the bootloader itself.

---Trilok Soni

-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.