summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorEugen Hristev <eugen.hristev@microchip.com>2017-10-11 14:21:14 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2017-10-14 19:52:07 +0100
commitca4c302398963c0cae29bc168e44cf91e40ff0d3 (patch)
tree3ebbaf7ff9379c5c8e250dacaf3dffde07d8155b
parent5151b4afb41dd7c5e13a130efcc95326a49da8c6 (diff)
downloadlinux-stable-ca4c302398963c0cae29bc168e44cf91e40ff0d3.tar.gz
linux-stable-ca4c302398963c0cae29bc168e44cf91e40ff0d3.tar.bz2
linux-stable-ca4c302398963c0cae29bc168e44cf91e40ff0d3.zip
iio: adc: at91-sama5d2_adc: fix probe error on missing trigger property
This fix allows platforms to probe correctly even if the trigger edge property is missing. The hardware trigger will no longer be registered in the sybsystem Preserves backwards compatibility with the support that was in the driver before the hardware trigger. https://storage.kernelci.org/mainline/master/v4.14-rc2-255-g74d83ec2b734/arm/sama5_defconfig/lab-free-electrons/boot-at91-sama5d2_xplained.txt Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> Fixes: 5e1a1da0f ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
-rw-r--r--drivers/iio/adc/at91-sama5d2_adc.c45
1 files changed, 29 insertions, 16 deletions
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index bc5b38e3a147..a70ef7fec95f 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -225,6 +225,7 @@ struct at91_adc_trigger {
char *name;
unsigned int trgmod_value;
unsigned int edge_type;
+ bool hw_trig;
};
struct at91_adc_state {
@@ -254,16 +255,25 @@ static const struct at91_adc_trigger at91_adc_trigger_list[] = {
.name = "external_rising",
.trgmod_value = AT91_SAMA5D2_TRGR_TRGMOD_EXT_TRIG_RISE,
.edge_type = IRQ_TYPE_EDGE_RISING,
+ .hw_trig = true,
},
{
.name = "external_falling",
.trgmod_value = AT91_SAMA5D2_TRGR_TRGMOD_EXT_TRIG_FALL,
.edge_type = IRQ_TYPE_EDGE_FALLING,
+ .hw_trig = true,
},
{
.name = "external_any",
.trgmod_value = AT91_SAMA5D2_TRGR_TRGMOD_EXT_TRIG_ANY,
.edge_type = IRQ_TYPE_EDGE_BOTH,
+ .hw_trig = true,
+ },
+ {
+ .name = "software",
+ .trgmod_value = AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER,
+ .edge_type = IRQ_TYPE_NONE,
+ .hw_trig = false,
},
};
@@ -597,7 +607,7 @@ static int at91_adc_probe(struct platform_device *pdev)
struct at91_adc_state *st;
struct resource *res;
int ret, i;
- u32 edge_type;
+ u32 edge_type = IRQ_TYPE_NONE;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
if (!indio_dev)
@@ -641,14 +651,14 @@ static int at91_adc_probe(struct platform_device *pdev)
ret = of_property_read_u32(pdev->dev.of_node,
"atmel,trigger-edge-type", &edge_type);
if (ret) {
- dev_err(&pdev->dev,
- "invalid or missing value for atmel,trigger-edge-type\n");
- return ret;
+ dev_dbg(&pdev->dev,
+ "atmel,trigger-edge-type not specified, only software trigger available\n");
}
st->selected_trig = NULL;
- for (i = 0; i < AT91_SAMA5D2_HW_TRIG_CNT; i++)
+ /* find the right trigger, or no trigger at all */
+ for (i = 0; i < AT91_SAMA5D2_HW_TRIG_CNT + 1; i++)
if (at91_adc_trigger_list[i].edge_type == edge_type) {
st->selected_trig = &at91_adc_trigger_list[i];
break;
@@ -717,24 +727,27 @@ static int at91_adc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, indio_dev);
- ret = at91_adc_buffer_init(indio_dev);
- if (ret < 0) {
- dev_err(&pdev->dev, "couldn't initialize the buffer.\n");
- goto per_clk_disable_unprepare;
- }
+ if (st->selected_trig->hw_trig) {
+ ret = at91_adc_buffer_init(indio_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "couldn't initialize the buffer.\n");
+ goto per_clk_disable_unprepare;
+ }
- ret = at91_adc_trigger_init(indio_dev);
- if (ret < 0) {
- dev_err(&pdev->dev, "couldn't setup the triggers.\n");
- goto per_clk_disable_unprepare;
+ ret = at91_adc_trigger_init(indio_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "couldn't setup the triggers.\n");
+ goto per_clk_disable_unprepare;
+ }
}
ret = iio_device_register(indio_dev);
if (ret < 0)
goto per_clk_disable_unprepare;
- dev_info(&pdev->dev, "setting up trigger as %s\n",
- st->selected_trig->name);
+ if (st->selected_trig->hw_trig)
+ dev_info(&pdev->dev, "setting up trigger as %s\n",
+ st->selected_trig->name);
dev_info(&pdev->dev, "version: %x\n",
readl_relaxed(st->base + AT91_SAMA5D2_VERSION));