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Tue, 28 Feb 2017 17:52:23 +0100 From: Fabrice Gasnier To: , , , , , Subject: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Date: Tue, 28 Feb 2017 17:51:19 +0100 Message-ID: <1488300679-3259-7-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1488300679-3259-1-git-send-email-fabrice.gasnier@st.com> References: <1488300679-3259-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG5NODE2.st.com (10.75.127.14) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-28_15:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170228_115257_758705_F277F5BF X-CRM114-Status: GOOD ( 14.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, benjamin.gaignard@linaro.org, lars@metafoo.de, alexandre.torgue@st.com, linux-iio@vger.kernel.org, pmeerw@pmeerw.net, mcoquelin.stm32@gmail.com, knaack.h@gmx.de, fabrice.gasnier@st.com, linus.walleij@linaro.org, benjamin.gaignard@st.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP EXTi (external interrupt) signal can be routed internally as trigger source for ADC conversions: STM32F4 ADC can use EXTI11. Retrieve interrupt trigger from DT, so it can be muxed into ADC IP, via extsel. Signed-off-by: Fabrice Gasnier --- drivers/iio/adc/stm32-adc.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 9b49a6ad..4d9040d 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -108,6 +108,9 @@ enum stm32_adc_extsel { STM32_EXT15, }; +/* EXTI 11 trigger selection on STM32F4 */ +#define STM32F4_EXTI11_EXTSEL STM32_EXT15 + /** * struct stm32_adc_trig_info - ADC trigger info * @name: name of the trigger, corresponding to its source @@ -146,6 +149,7 @@ struct stm32_adc_regs { * @rx_buf: dma rx buffer cpu address * @rx_dma_buf: dma rx buffer bus address * @rx_buf_sz: dma rx buffer size + * @exti_trig EXTI trigger */ struct stm32_adc { struct stm32_adc_common *common; @@ -162,6 +166,7 @@ struct stm32_adc { u8 *rx_buf; dma_addr_t rx_dma_buf; unsigned int rx_buf_sz; + struct iio_trigger *exti_trig; }; /** @@ -395,10 +400,15 @@ static int stm32_adc_conf_scan_seq(struct iio_dev *indio_dev, * * Returns trigger extsel value, if trig matches, -EINVAL otherwise. */ -static int stm32_adc_get_trig_extsel(struct iio_trigger *trig) +static int stm32_adc_get_trig_extsel(struct iio_dev *indio_dev, + struct iio_trigger *trig) { + struct stm32_adc *adc = iio_priv(indio_dev); int i; + if (trig == adc->exti_trig) + return STM32F4_EXTI11_EXTSEL; + /* lookup triggers registered by stm32 timer trigger driver */ for (i = 0; stm32f4_adc_trigs[i].name; i++) { /** @@ -432,7 +442,7 @@ static int stm32_adc_set_trig(struct iio_dev *indio_dev, int ret; if (trig) { - ret = stm32_adc_get_trig_extsel(trig); + ret = stm32_adc_get_trig_extsel(indio_dev, trig); if (ret < 0) return ret; @@ -604,7 +614,7 @@ static irqreturn_t stm32_adc_isr(int irq, void *data) static int stm32_adc_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) { - return stm32_adc_get_trig_extsel(trig) < 0 ? -EINVAL : 0; + return stm32_adc_get_trig_extsel(indio_dev, trig) < 0 ? -EINVAL : 0; } static int stm32_adc_set_watermark(struct iio_dev *indio_dev, unsigned int val) @@ -1030,6 +1040,17 @@ static int stm32_adc_probe(struct platform_device *pdev) if (ret < 0) goto err_clk_disable; + adc->exti_trig = devm_iio_trigger_get_by_name(&pdev->dev, "exti"); + if (IS_ERR(adc->exti_trig)) { + ret = PTR_ERR(adc->exti_trig); + if (ret == -EPROBE_DEFER) + goto err_dma_disable; + dev_dbg(&pdev->dev, "No exti trigger found (%d)\n", ret); + adc->exti_trig = NULL; + } else { + dev_info(&pdev->dev, "Can use %s\n", adc->exti_trig->name); + } + ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, &stm32_adc_trigger_handler,