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

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Date:	Sat, 24 Jul 2010 20:38:49 +0530
From:	Trilok Soni <tsoni@...eaurora.org>
To:	Kenneth Heitke <kheitke@...eaurora.org>
CC:	khali@...ux-fr.org, ben-linux@...ff.org,
	linux-arm-msm@...r.kernel.org, Crane Cai <crane.cai@....com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	srinidhi kasagar <srinidhi.kasagar@...ricsson.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: QUP based bus driver for Qualcomm MSM chipsets

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.
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