From: Fabrice Gasnier <fabrice.gasnier@st.com>
To: <jic23@kernel.org>, <linux@armlinux.org.uk>, <robh+dt@kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <linux-iio@vger.kernel.org>, <mark.rutland@arm.com>,
<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>,
<lars@metafoo.de>, <knaack.h@gmx.de>, <pmeerw@pmeerw.net>,
<fabrice.gasnier@st.com>, <benjamin.gaignard@linaro.org>,
<benjamin.gaignard@st.com>, <linus.walleij@linaro.org>
Subject: [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger
Date: Tue, 28 Feb 2017 17:51:19 +0100 [thread overview]
Message-ID: <1488300679-3259-7-git-send-email-fabrice.gasnier@st.com> (raw)
In-Reply-To: <1488300679-3259-1-git-send-email-fabrice.gasnier@st.com>
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 <fabrice.gasnier@st.com>
---
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,
--
1.9.1
next prev parent reply other threads:[~2017-02-28 17:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1488300679-3259-1-git-send-email-fabrice.gasnier@st.com>
2017-02-28 16:51 ` [PATCH v3 1/6] dt-bindings: iio: introduce trigger providers, consumers Fabrice Gasnier
2017-03-03 6:21 ` Rob Herring
2017-03-03 9:32 ` Fabrice Gasnier
2017-03-05 11:45 ` Jonathan Cameron
2017-03-05 11:43 ` Jonathan Cameron
2017-03-05 12:13 ` Jonathan Cameron
2017-03-15 19:25 ` Rob Herring
2017-03-17 15:59 ` Fabrice Gasnier
2017-03-19 22:58 ` Jonathan Cameron
2017-02-28 16:51 ` [PATCH v3 2/6] iio: trigger: add OF support Fabrice Gasnier
2017-03-05 12:11 ` Jonathan Cameron
2017-03-14 15:22 ` Linus Walleij
2017-02-28 16:51 ` [PATCH v3 3/6] dt-bindings: iio: document interrupt trigger support Fabrice Gasnier
2017-03-05 12:16 ` Jonathan Cameron
2017-03-15 19:29 ` Rob Herring
2017-02-28 16:51 ` [PATCH v3 4/6] iio: iio-interrupt-trigger: device-tree support Fabrice Gasnier
2017-03-05 12:18 ` Jonathan Cameron
2017-02-28 16:51 ` [PATCH v3 5/6] dt-bindings: iio: stm32-adc: add external interrupt trigger Fabrice Gasnier
2017-02-28 16:51 ` Fabrice Gasnier [this message]
2017-03-03 11:45 ` [PATCH v3 6/6] iio: adc: stm32: add support for EXTI trigger Lars-Peter Clausen
2017-03-03 13:00 ` Fabrice Gasnier
2017-03-03 15:46 ` Lars-Peter Clausen
2017-03-03 15:47 ` Lars-Peter Clausen
2017-03-05 12:21 ` Jonathan Cameron
2017-03-05 12:28 ` Jonathan Cameron
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