From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965345AbcJYQ31 (ORCPT ); Tue, 25 Oct 2016 12:29:27 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:55791 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S941759AbcJYQ0o (ORCPT ); Tue, 25 Oct 2016 12:26:44 -0400 From: Fabrice Gasnier To: , , , CC: , , , , , , , , , Subject: [PATCH 04/10] iio: adc: stm32: add optional support for exti gpios Date: Tue, 25 Oct 2016 18:25:16 +0200 Message-ID: <1477412722-24061-5-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1477412722-24061-1-git-send-email-fabrice.gasnier@st.com> References: <1477412722-24061-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.48.0.167] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-10-25_15:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org STM32 ADC may use EXTi signals routed internally as trigger source for conversions. Configure them as interrupt to configure this path in HW to adc. Note: interrupt handler isn't required here, and corresponding interrupt can be kept masked at exti controller level. Signed-off-by: Fabrice Gasnier --- drivers/iio/adc/stm32/stm32-adc.c | 45 +++++++++++++++++++++++++++++++++++++++ drivers/iio/adc/stm32/stm32-adc.h | 3 +++ 2 files changed, 48 insertions(+) diff --git a/drivers/iio/adc/stm32/stm32-adc.c b/drivers/iio/adc/stm32/stm32-adc.c index 25d0307..1a13450 100644 --- a/drivers/iio/adc/stm32/stm32-adc.c +++ b/drivers/iio/adc/stm32/stm32-adc.c @@ -482,6 +482,12 @@ static irqreturn_t stm32_adc_common_isr(int irq, void *data) return ret; } +static irqreturn_t stm32_adc_exti_handler(int irq, void *data) +{ + /* Exti handler should not be invoqued, and is not used */ + return IRQ_HANDLED; +} + /** * stm32_adc_validate_trigger() - validate trigger for stm32 adc * @indio_dev: IIO device @@ -1051,6 +1057,41 @@ static void stm32_adc_unregister(struct stm32_adc *adc) } } +static int stm32_adc_exti_probe(struct stm32_adc_common *common) +{ + int i, irq, ret; + + common->gpios = devm_gpiod_get_array_optional(common->dev, NULL, + GPIOD_IN); + if (!common->gpios) + return 0; + + for (i = 0; i < common->gpios->ndescs; i++) { + irq = gpiod_to_irq(common->gpios->desc[i]); + if (irq < 0) { + dev_err(common->dev, "gpio %d to irq failed\n", i); + return irq; + } + + ret = devm_request_irq(common->dev, irq, stm32_adc_exti_handler, + 0, dev_name(common->dev), common); + if (ret) { + dev_err(common->dev, "request IRQ %d failed\n", irq); + return ret; + } + + /* + * gpios are configured as interrupts, so exti trigger path is + * configured in HW. But getting interrupts when starting + * conversions is unused here, so mask it in on exti + * controller by default. + */ + disable_irq(irq); + } + + return 0; +} + int stm32_adc_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node, *child; @@ -1131,6 +1172,10 @@ int stm32_adc_probe(struct platform_device *pdev) goto err_clk_disable; } + ret = stm32_adc_exti_probe(common); + if (ret) + goto err_clk_disable; + /* Parse adc child nodes to retrieve master/slave instances data */ for_each_available_child_of_node(np, child) { ret = stm32_adc_register(common, child); diff --git a/drivers/iio/adc/stm32/stm32-adc.h b/drivers/iio/adc/stm32/stm32-adc.h index 01a0dda..fe3568b 100644 --- a/drivers/iio/adc/stm32/stm32-adc.h +++ b/drivers/iio/adc/stm32/stm32-adc.h @@ -23,6 +23,7 @@ #define __STM32_ADC_H #include +#include #include /* @@ -323,6 +324,7 @@ struct stm32_adc { * @aclk: common clock for the analog circuitry * @vref: regulator reference * @vref_mv: vref voltage (mv) + * @gpio_descs: gpio descriptor used to configure EXTi triggers * @lock: mutex */ struct stm32_adc_common { @@ -335,6 +337,7 @@ struct stm32_adc_common { struct clk *aclk; struct regulator *vref; int vref_mv; + struct gpio_descs *gpios; struct mutex lock; /* read_raw lock */ }; -- 1.9.1