Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752916AbbKQERs (ORCPT ); Mon, 16 Nov 2015 23:17:48 -0500 Received: from mail-qk0-f178.google.com ([209.85.220.178]:36792 "EHLO mail-qk0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752813AbbKQERq (ORCPT ); Mon, 16 Nov 2015 23:17:46 -0500 From: Cory Tusar To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, agust@denx.de, gregkh@linuxfoundation.org Cc: jic23@kernel.org, vz@mleia.com, broonie@kernel.org, afd@ti.com, andrew@lunn.ch, Chris.Healy@zii.aero, Keith.Vennel@zii.aero, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Cory Tusar Subject: [PATCH 7/7] misc: eeprom: 93xx46: Add support for a GPIO 'select' line. Date: Mon, 16 Nov 2015 23:16:36 -0500 Message-Id: <1447733796-15546-8-git-send-email-cory.tusar@pid1solutions.com> X-Mailer: git-send-email 2.4.10 In-Reply-To: <1447733796-15546-1-git-send-email-cory.tusar@pid1solutions.com> References: <1447733796-15546-1-git-send-email-cory.tusar@pid1solutions.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2635 Lines: 84 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 --- 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..3f41696 100644 --- a/drivers/misc/eeprom/eeprom_93xx46.c +++ b/drivers/misc/eeprom/eeprom_93xx46.c @@ -10,11 +10,14 @@ #include #include +#include +#include #include #include #include #include #include +#include #include #include #include @@ -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); +} + +static void select_deassert(void *context) +{ + struct eeprom_93xx46_dev *edev = context; + + gpiod_set_value_cansleep(gpio_to_desc(edev->pdata->select_gpio), 0); +} + 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-gpio", 0); + 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; }; -- 2.4.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/