Commit 3e4ef8e8 authored by Alexandru Ardelean's avatar Alexandru Ardelean Committed by Jonathan Cameron
Browse files

iio: adc: at91_adc: const-ify some driver data 



The main intent is to get rid of the cast for the void-pointer returned by
of_device_get_match_data().

This requires const-ifying the 'caps' and 'registers' references on the
at91_adc_state struct.

The caps can be obtained also from the old platform_data (in the
at91_adc_probe_pdata() function), but that cast is not touched in this
patch, since the old platform_data should be removed/cleaned-away.
Also, that cast deals with converting a kernel_ulong_t type to a pointer.
So, updating that cast doesn't yield any benefit.

Signed-off-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
Reviewed-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200930135048.11530-3-alexandru.ardelean@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent ad49bd57

drivers/iio/adc/at91_adc.c

+4 −4
Original line number Diff line number Diff line
@@ -202,7 +202,7 @@ struct at91_adc_state { 
	struct mutex		lock;

	u8			num_channels;

	void __iomem		*reg_base;

	struct at91_adc_reg_desc *registers;

	const struct at91_adc_reg_desc *registers;

	u32			startup_time;

	u8			sample_hold_time;

	bool			sleep_mode;
@@ -214,7 +214,7 @@ struct at91_adc_state { 
	u32			res;		/* resolution used for convertions */

	bool			low_res;	/* the resolution corresponds to the lowest one */

	wait_queue_head_t	wq_data_avail;

	struct at91_adc_caps	*caps;

	const struct at91_adc_caps	*caps;



	/*

	 * Following ADC channels are shared by touchscreen:
@@ -550,7 +550,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) 
{

	struct iio_dev *idev = iio_trigger_get_drvdata(trig);

	struct at91_adc_state *st = iio_priv(idev);

	struct at91_adc_reg_desc *reg = st->registers;

	const struct at91_adc_reg_desc *reg = st->registers;

	u32 status = at91_adc_readl(st, reg->trigger_register);

	int value;

	u8 bit;
@@ -876,7 +876,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev, 
	if (!node)

		return -EINVAL;



	st->caps = (struct at91_adc_caps *)of_device_get_match_data(&pdev->dev);

	st->caps = of_device_get_match_data(&pdev->dev);



	st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");