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

[Florian Fainelli <f.fainelli@gmail.com>]

On 19/12/14 15:03, Jonathan Richardson wrote:
> On 14-12-19 02:26 PM, Joe Perches wrote:
>> On Fri, 2014-12-19 at 14:17 -0800, Jonathan Richardson wrote:
>>> Add initial version of the Broadcom touchscreen driver.
>>
>> more trivia:
>>
>>> diff --git a/drivers/input/touchscreen/bcm_iproc_tsc.c b/drivers/input/touchscreen/bcm_iproc_tsc.c
>> []
>>> +static int get_tsc_config(struct device_node *np, struct iproc_ts_priv *priv)
>>> +{
>>> +	u32 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;

BTW, common practice for DT properties is to use a dash instead of an
underscore for multi-worded properties.

>>
>> Doesn't the compiler generate a warning message
>> about an impossible "unsigned < 0" test for all
>> of these "val < 0" uses?
>>
> 
> Actually no it doesn't. The gcc output shows that neither -Wtype-limits
> nor -Wextra are used to compile that file. I assume this is because
> there would be just too many warnings.
> 
> 
>>> +	}
>>> +
>>> +	if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
>>> +		if (val < 0 || val > 11) {
>> []
>>> +	if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
>>> +		if (val < 0 || val > 255) {
>> []
>>> +	if (of_property_read_u32(np, "average_data", &val) >= 0) {
>>> +		if (val < 0 || val > 8) {
>> []
>>> +	if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
>>> +		if (val < 0 || val > 31) {
>>
>>
> 
> 
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-- 
Florian