On 19.11.2015 05:29, 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@xxxxxxxxxxxxxxxxx>
> ---
> drivers/misc/eeprom/eeprom_93xx46.c | 26 ++++++++++++++++++++++++++
> include/linux/eeprom_93xx46.h | 1 +
> 2 files changed, 27 insertions(+)
>
> diff --git a/drivers/misc/eeprom/eeprom_93xx46.c b/drivers/misc/eeprom/eeprom_93xx46.c
> index 0386b03..375951f 100644
> --- a/drivers/misc/eeprom/eeprom_93xx46.c
> +++ b/drivers/misc/eeprom/eeprom_93xx46.c
> @@ -10,11 +10,14 @@
>
> #include <linux/delay.h>
> #include <linux/device.h>
> +#include <linux/gpio.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>
Please double check, adding only linux/of_gpio.h header should work,
linux/gpio.h and linux/gpio/consumer.h are redundant.
> #include <linux/slab.h>
> #include <linux/spi/spi.h>
> #include <linux/sysfs.h>
> @@ -344,6 +347,20 @@ static ssize_t eeprom_93xx46_store_erase(struct device *dev,
> static DEVICE_ATTR(erase, S_IWUSR, NULL, eeprom_93xx46_store_erase);
>
> #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()
> +}
> +
> +static void select_deassert(void *context)
> +{
> + struct eeprom_93xx46_dev *edev = context;
> +
> + gpiod_set_value_cansleep(gpio_to_desc(edev->pdata->select_gpio), 0);
Same here.
> +}
> +
> 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.
> + if (ret < 0) {
> + pd->select_gpio = -1;
> + } else {
> + pd->select_gpio = ret;
> + pd->prepare = select_assert;
> + pd->finish = select_deassert;
> + }
> +
> 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..aa472c7 100644
> --- a/include/linux/eeprom_93xx46.h
> +++ b/include/linux/eeprom_93xx46.h
> @@ -21,4 +21,5 @@ struct eeprom_93xx46_platform_data {
> */
> void (*prepare)(void *);
> void (*finish)(void *);
> + unsigned int select_gpio;
Same questions as in v2 4/5.
> };
>
--
With best wishes,
Vladimir
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