linux-kernel - Re: [PATCH v2 1/2] Input: touchscreen-iproc: Add Broadcom iProc touchscreen driver

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Date:	Thu, 15 Jan 2015 11:51:38 -0800
From:	Jonathan Richardson <jonathar@...adcom.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Scott Branden <sbranden@...adcom.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, Ray Jui <rjui@...adcom.com>,
	<linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<devicetree@...r.kernel.org>, "Joe Perches" <joe@...ches.com>
Subject: Re: [PATCH v2 1/2] Input: touchscreen-iproc: Add Broadcom iProc touchscreen
 driver

Hi Dmitry,

On 15-01-14 10:07 PM, Dmitry Torokhov wrote:
> On Wed, Jan 14, 2015 at 09:44:39PM -0800, Scott Branden wrote:
>> On 15-01-14 05:02 PM, Dmitry Torokhov wrote:
>>> Hi Jonathan,
>>>
>>> On Fri, Dec 19, 2014 at 02:17:49PM -0800, Jonathan Richardson wrote:
>>>> +	if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
>>>> +		if (val < 1 || val > 256) {
>>>> +			dev_err(dev, "scanning_period must be [1-256]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.scanning_period = val;
>>>> +	}
>>>> +
>>>> +	if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
>>>> +		if (val < 0 || val > 255) {
>>>> +			dev_err(dev, "debounce_timeout must be [0-255]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.debounce_timeout = val;
>>>> +	}
>>>> +
>>>> +	if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
>>>> +		if (val < 0 || val > 11) {
>>>> +			dev_err(dev, "settling_timeout must be [0-11]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.settling_timeout = val;
>>>> +	}
>>>> +
>>>> +	if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
>>>> +		if (val < 0 || val > 255) {
>>>> +			dev_err(dev, "touch_timeout must be [0-255]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.touch_timeout = val;
>>>> +	}
>>>> +
>>>> +	if (of_property_read_u32(np, "average_data", &val) >= 0) {
>>>> +		if (val < 0 || val > 8) {
>>>> +			dev_err(dev, "average_data must be [0-8]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.average_data = val;
>>>> +	}
>>>> +
>>>> +	if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
>>>> +		if (val < 0 || val > 31) {
>>>> +			dev_err(dev, "fifo_threshold must be [0-31]\n");
>>>> +			return -EINVAL;
>>>> +		}
>>>> +		priv->cfg_params.fifo_threshold = val;
>>>> +	}
>>>
>>> I think these are dveice specific and thus should have "brcm," prefix.
>> I'm confused as to why we need the brcm prefix?  Other device tree
>> bindings we have for other drivers do not need such prefix.
> 
> Properties that are not standard on the system (reg, interrupts,
> clkocks, etc) or subsystem level customarily carry the vendor prefix so
> that they do not clash with newly added global or subsystem properties.
> 
>>  Is this
>> convention documented somewhere?
> 
> Not sure. I glanced through Documentation/devicetree and do not see it
> spelled out. Device tree overlords, what say you?

Let me know. I haven't seen this before either. I will change the
entries to use dashes though instead of underscores but will wait until
these other issues are decided on before sending out another patch.

> 
>>>
>>>> +
>>>> +	priv->ts_rotation = TS_ROTATION_0;
>>>> +	if (of_property_read_u32(np, "ts-rotation", &val) >= 0) {
>>>> +		priv->ts_rotation = val;
>>>> +		dev_dbg(dev, "ts rotation [%d] degrees\n",
>>>> +			90 * priv->ts_rotation);
>>>> +	}
>>>
>>> This I am not quite sure about - if we want rotation or swap+invert. You
>>> are CCed on another email (tsc2007) that talks about need of generic
>>> touchscreen transforms in input core/of bindings.
>> Does such generic binding exist today?  If not, I would like to go
>> with this implementation and update to the new binding if/when it
>> exists?
> 
> Not yet but there several people interested. I think we have enough time
> till 3.20 to hash it out properly.

I think the rotation is simpler personally. Everyone would understand
rotation refers to how it's oriented but I'm not sure everyone would
immediately know how it is wired. Let me know what is decided and I'll
make any changes required.

Thanks,
Jon


> 
> Thanks.
> 

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