linux-kernel - Re: [PATCH v2 5/5] misc: eeprom_93xx46: Add support for a GPIO 'select' line.

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Date:	Thu, 19 Nov 2015 18:52:57 +0200
From:	Vladimir Zapolskiy <vz@...ia.com>
To:	Andrew Lunn <andrew@...n.ch>
CC:	Cory Tusar <cory.tusar@...1solutions.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, agust@...x.de,
	gregkh@...uxfoundation.org, jic23@...nel.org, broonie@...nel.org,
	afd@...com, Chris.Healy@....aero, Keith.Vennel@....aero,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] misc: eeprom_93xx46: Add support for a GPIO 'select'
 line.

On 19.11.2015 16:18, Andrew Lunn wrote:
>>>  #ifdef CONFIG_OF
>>> +static void select_assert(void *context)
>>> +{
>>> +	struct eeprom_93xx46_dev *edev = context;
>>> +
>>> +	gpiod_set_value_cansleep(gpio_to_desc(edev->pdata->select_gpio), 1);
>>
>> I would suggest to use gpio_set_value()
> 
> Could you explain why?
> 
> Maybe this gpio is on an SPI GPIO expander?

My point is that gpio_*() interface, gpio_set_value() or
gpio_set_value_cansleep(), might be preferred is this particular case.

I know it is legacy, but in this case there is no difference, if the
target have gpiolib, and the interface is broken, if the target does not
have gpiolib.

> 
>>>  static const struct of_device_id eeprom_93xx46_of_table[] = {
>>>  	{ .compatible = "eeprom-93xx46", },
>>>  	{ .compatible = "atmel,at93c46d", .data = &atmel_at93c46d_data, },
>>> @@ -385,6 +402,15 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
>>>  	if (of_property_read_bool(np, "read-only"))
>>>  		pd->flags |= EE_READONLY;
>>>  
>>> +	ret = of_get_named_gpio(np, "select-gpios", 0);
>>
>> gpios or gpio? I see only one requested gpio.
> 
> DT always uses the plural. Go read some bindins in Documentation/devicetree/bindings/
> 

Ok.

--
With best wishes,
Vladimir
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