linux-kernel - Re: [PATCH v4 5/5] misc: eeprom_93xx46: Add support for a GPIO 'select' line.

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Message-ID: <568C8855.1070106@pid1solutions.com>
Date:	Tue, 5 Jan 2016 22:21:57 -0500
From:	Cory Tusar <cory.tusar@...1solutions.com>
To:	Vladimir Zapolskiy <vz@...ia.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	gregkh@...uxfoundation.org
Cc:	jic23@...nel.org, broonie@...nel.org, afd@...com, andrew@...n.ch,
	Chris.Healy@....aero, Keith.Vennel@....aero,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/5] misc: eeprom_93xx46: Add support for a GPIO
 'select' line.

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Hash: SHA1

On 12/21/2015 07:30 PM, Vladimir Zapolskiy wrote:
> Hi Cory,
> 
> On 10.12.2015 06:00, Cory Tusar wrote:
>> This commit adds support to the eeprom_93x46 driver allowing a GPIO line
>> to function as a 'select' or 'enable' signal prior to accessing the
>> EEPROM.
>>
>> Signed-off-by: Cory Tusar <cory.tusar@...1solutions.com>
>> Tested-by: Chris Healy <chris.healy@....aero>
>> ---
>>  drivers/misc/eeprom/eeprom_93xx46.c | 35 +++++++++++++++++++++++++++++++++++
>>  include/linux/eeprom_93xx46.h       |  3 +++
>>  2 files changed, 38 insertions(+)
>>
>> diff --git a/drivers/misc/eeprom/eeprom_93xx46.c b/drivers/misc/eeprom/eeprom_93xx46.c
>> index d50bc17..d28fac2 100644
>> --- a/drivers/misc/eeprom/eeprom_93xx46.c
>> +++ b/drivers/misc/eeprom/eeprom_93xx46.c
>> @@ -10,11 +10,13 @@
>>  
>>  #include <linux/delay.h>
>>  #include <linux/device.h>
>> +#include <linux/gpio/consumer.h>
>>  #include <linux/kernel.h>
>>  #include <linux/module.h>
>>  #include <linux/mutex.h>
>>  #include <linux/of.h>
>>  #include <linux/of_device.h>
>> +#include <linux/of_gpio.h>
>>  #include <linux/slab.h>
>>  #include <linux/spi/spi.h>
>>  #include <linux/sysfs.h>
>> @@ -343,6 +345,20 @@ static ssize_t eeprom_93xx46_store_erase(struct device *dev,
>>  }
>>  static DEVICE_ATTR(erase, S_IWUSR, NULL, eeprom_93xx46_store_erase);
>>  
>> +static void select_assert(void *context)
>> +{
>> +	struct eeprom_93xx46_dev *edev = context;
>> +
>> +	gpiod_set_value_cansleep(edev->pdata->select, 1);
>> +}
>> +
>> +static void select_deassert(void *context)
>> +{
>> +	struct eeprom_93xx46_dev *edev = context;
>> +
>> +	gpiod_set_value_cansleep(edev->pdata->select, 0);
>> +}
>> +
>>  static const struct of_device_id eeprom_93xx46_of_table[] = {
>>  	{ .compatible = "eeprom-93xx46", },
>>  	{ .compatible = "atmel,at93c46d", .data = &atmel_at93c46d_data, },
>> @@ -357,6 +373,8 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
>>  	struct device_node *np = spi->dev.of_node;
>>  	struct eeprom_93xx46_platform_data *pd;
>>  	u32 tmp;
>> +	int gpio;
>> +	enum of_gpio_flags of_flags;
>>  	int ret;
>>  
>>  	pd = devm_kzalloc(&spi->dev, sizeof(*pd), GFP_KERNEL);
>> @@ -381,6 +399,23 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
>>  	if (of_property_read_bool(np, "read-only"))
>>  		pd->flags |= EE_READONLY;
>>  
>> +	gpio = of_get_named_gpio_flags(np, "select-gpios", 0, &of_flags);
>> +	if (gpio_is_valid(gpio)) {
>> +		unsigned long flags =
>> +			of_flags == OF_GPIO_ACTIVE_LOW ? GPIOF_ACTIVE_LOW : 0;
>> +
>> +		ret = devm_gpio_request_one(&spi->dev, gpio, flags,
>> +					    "eeprom_93xx46_select");
>> +		if (ret)
>> +			return ret;
>> +
>> +		pd->select = gpio_to_desc(gpio);
>> +		pd->prepare = select_assert;
>> +		pd->finish = select_deassert;
>> +
>> +		gpiod_direction_output(pd->select, 0);
>> +	}
>> +
>>  	if (of_id->data) {
>>  		const struct eeprom_93xx46_devtype_data *data = of_id->data;
>>  
>> diff --git a/include/linux/eeprom_93xx46.h b/include/linux/eeprom_93xx46.h
>> index 92fa4c3..03f3435 100644
>> --- a/include/linux/eeprom_93xx46.h
>> +++ b/include/linux/eeprom_93xx46.h
>> @@ -3,6 +3,8 @@
>>   * platform description for 93xx46 EEPROMs.
>>   */
>>  
>> +#include <linux/of_gpio.h>
>> +
> 
> You need just "struct gpio_desc;" instead of the include here, please fix.

Hi Vladimir,

I'll fix for v5.

> 
>>  struct eeprom_93xx46_platform_data {
>>  	unsigned char	flags;
>>  #define EE_ADDR8	0x01		/*  8 bit addr. cfg */
>> @@ -21,4 +23,5 @@ struct eeprom_93xx46_platform_data {
>>  	 */
>>  	void (*prepare)(void *);
>>  	void (*finish)(void *);
>> +	struct gpio_desc *select;
>>  };
>>
> 
> Reviewed-by: Vladimir Zapolskiy <vz@...ia.com>

Thanks and best regards,
- -Cory


- -- 
Cory Tusar
Principal
PID 1 Solutions, Inc.


"There are two ways of constructing a software design.  One way is to
 make it so simple that there are obviously no deficiencies, and the
 other way is to make it so complicated that there are no obvious
 deficiencies."  --Sir Charles Anthony Richard Hoare

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