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

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Date:	Fri, 19 Dec 2014 11:51:33 -0800
From:	Jonathan Richardson <jonathar@...adcom.com>
To:	Joe Perches <joe@...ches.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.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>
Subject: Re: [PATCH 1/2] Input: touchscreen-iproc: Add Broadcom iProc touchscreen
 driver

Thanks Joe. I'll send out a new patch set with your suggestions/fixes
shortly.

On 14-12-17 06:14 PM, Joe Perches wrote:
> On Wed, 2014-12-17 at 17:59 -0800, Jonathan Richardson wrote:
>> Add initial version of the Broadcom touchscreen driver.
> 
> trivia:
> 
>> diff --git a/drivers/input/touchscreen/bcm_iproc_tsc.c b/drivers/input/touchscreen/bcm_iproc_tsc.c
> 
>> +/* Bit values for REGCTL2 */
>> +#define TS_CONTROLLER_EN_BIT    (1 << 16)
>> +#define TS_CONTROLLER_AVGDATA_SHIFT 8
>> +#define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
>> +#define TS_CONTROLLER_PWR_LDO   (1<<5)
>> +#define TS_CONTROLLER_PWR_ADC   (1<<4)
>> +#define TS_CONTROLLER_PWR_BGP   (1<<3)
>> +#define TS_CONTROLLER_PWR_TS    (1<<2)
>> +#define TS_WIRE_MODE_BIT        (1<<1)
> 
> Be nicer to use the same spacing around <<
> or maybe use the BIT macro.
> 
> []
> 
>> +static int get_tsc_config(struct device_node *np, struct iproc_ts_priv *priv)
>> +{
>> +	int ret;
>> +	u32 val;
>> +	struct device *dev = &priv->pdev->dev;
>> +
>> +	priv->cfg_params = default_config;
>> +
>> +	ret = of_property_read_u32(np, "scanning_period", &val);
>> +	if (ret >= 0) {
>> +		if ((1 <= val) && (val <= 256))
>> +			priv->cfg_params.scanning_period = val;
>> +		else {
>> +			dev_err(dev, "scanning_period must be [1-256]");
>> +			return -EINVAL;
>> +		}
> 
> ret is never used so I'd probably remove it
> from all these blocks.
> 
> It's probably be nicer to invert the logic ald
> remove the else.
> 
> There's a missing terminating newline too.
> 
> Something like:
> 
> 	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;
> 	}
> 
> etc...
> 
> 
> --
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