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iio: adc: ad7124: add clock output support

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Add support for the AD7124's internal clock output. If the #clock-cells
property is present, turn on the internal clock output during probe.

If both the clocks and #clock-names properties are present (not allowed
by devicetree bindings), assume that an external clock is being used so
that we don't accidentally have two outputs fighting each other.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250828-iio-adc-ad7124-proper-clock-support-v3-4-0b317b4605e5@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner 2025-08-28 16:54:55 -05:00 committed by Jonathan Cameron
parent ed231e253f
commit dfbbee0907
1 changed files with 33 additions and 0 deletions
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33
drivers/iio/adc/ad7124.c
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@ -6,7 +6,9 @@
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/cleanup.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
@ -18,6 +20,7 @@
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <linux/sprintf.h>
#include <linux/units.h>
#include <linux/iio/iio.h>
@ -1189,6 +1192,36 @@ static int ad7124_setup(struct ad7124_state *st)
clk_sel = AD7124_ADC_CONTROL_CLK_SEL_INT;
st->clk_hz = AD7124_INT_CLK_HZ;
} else if (!device_property_present(dev, "clocks") &&
device_property_present(dev, "#clock-cells")) {
#ifdef CONFIG_COMMON_CLK
struct clk_hw *clk_hw;
const char *name __free(kfree) = kasprintf(GFP_KERNEL, "%pfwP-clk",
dev_fwnode(dev));
if (!name)
return -ENOMEM;
clk_hw = devm_clk_hw_register_fixed_rate(dev, name, NULL, 0,
AD7124_INT_CLK_HZ);
if (IS_ERR(clk_hw))
return dev_err_probe(dev, PTR_ERR(clk_hw),
"Failed to register clock provider\n");
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
clk_hw);
if (ret)
return dev_err_probe(dev, ret,
"Failed to add clock provider\n");
#endif
/*
* Treat the clock as always on. This way we don't have to deal
* with someone trying to enable/disable the clock while we are
* reading samples.
*/
clk_sel = AD7124_ADC_CONTROL_CLK_SEL_INT_OUT;
st->clk_hz = AD7124_INT_CLK_HZ;
} else {
struct clk *clk;