linux-kernel - [PATCH] staging: iio: ad9832: remove platform

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Message-ID: <20251204185434.4542-1-tomasborquez13@gmail.com>
Date: Thu,  4 Dec 2025 15:54:34 -0300
From: Tomas Borquez <tomasborquez13@...il.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	Tomas Borquez <tomasborquez13@...il.com>
Subject: [PATCH] staging: iio: ad9832: remove platform_data support

Remove legacy platform_data support as there are no in tree users and
this approach belongs to a long gone era. The policy decision on what
to output is a userspace problem, not something that should be provided
from firmware.

The driver now initializes the device to a safe state (SLEEP|RESET|CLR)
outputting nothing. Userspace can configure the desired frequencies and
phases via the existing sysfs attributes once the device is ready to be 
used.

Suggested-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Tomas Borquez <tomasborquez13@...il.com>
---
Original discussion: 
https://lore.kernel.org/linux-iio/20250628161040.3d21e2c4@jic23-huawei/

 drivers/staging/iio/frequency/ad9832.c | 32 -------------------------
 drivers/staging/iio/frequency/ad9832.h | 33 --------------------------
 2 files changed, 65 deletions(-)
 delete mode 100644 drivers/staging/iio/frequency/ad9832.h

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 49388da5a6..e2ad3e5a7a 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -23,8 +23,6 @@
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
-#include "ad9832.h"
-
 #include "dds.h"
 
 /* Registers */
@@ -299,16 +297,10 @@ static const struct iio_info ad9832_info = {
 
 static int ad9832_probe(struct spi_device *spi)
 {
-	struct ad9832_platform_data *pdata = dev_get_platdata(&spi->dev);
 	struct iio_dev *indio_dev;
 	struct ad9832_state *st;
 	int ret;
 
-	if (!pdata) {
-		dev_dbg(&spi->dev, "no platform data?\n");
-		return -ENODEV;
-	}
-
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;
@@ -379,30 +371,6 @@ static int ad9832_probe(struct spi_device *spi)
 		return ret;
 	}
 
-	ret = ad9832_write_frequency(st, AD9832_FREQ0HM, pdata->freq0);
-	if (ret)
-		return ret;
-
-	ret = ad9832_write_frequency(st, AD9832_FREQ1HM, pdata->freq1);
-	if (ret)
-		return ret;
-
-	ret = ad9832_write_phase(st, AD9832_PHASE0H, pdata->phase0);
-	if (ret)
-		return ret;
-
-	ret = ad9832_write_phase(st, AD9832_PHASE1H, pdata->phase1);
-	if (ret)
-		return ret;
-
-	ret = ad9832_write_phase(st, AD9832_PHASE2H, pdata->phase2);
-	if (ret)
-		return ret;
-
-	ret = ad9832_write_phase(st, AD9832_PHASE3H, pdata->phase3);
-	if (ret)
-		return ret;
-
 	return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
diff --git a/drivers/staging/iio/frequency/ad9832.h b/drivers/staging/iio/frequency/ad9832.h
deleted file mode 100644
index d0d840edb8..0000000000
--- a/drivers/staging/iio/frequency/ad9832.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * AD9832 SPI DDS driver
- *
- * Copyright 2011 Analog Devices Inc.
- */
-#ifndef IIO_DDS_AD9832_H_
-#define IIO_DDS_AD9832_H_
-
-/*
- * TODO: struct ad9832_platform_data needs to go into include/linux/iio
- */
-
-/**
- * struct ad9832_platform_data - platform specific information
- * @freq0:		power up freq0 tuning word in Hz
- * @freq1:		power up freq1 tuning word in Hz
- * @phase0:		power up phase0 value [0..4095] correlates with 0..2PI
- * @phase1:		power up phase1 value [0..4095] correlates with 0..2PI
- * @phase2:		power up phase2 value [0..4095] correlates with 0..2PI
- * @phase3:		power up phase3 value [0..4095] correlates with 0..2PI
- */
-
-struct ad9832_platform_data {
-	unsigned long		freq0;
-	unsigned long		freq1;
-	unsigned short		phase0;
-	unsigned short		phase1;
-	unsigned short		phase2;
-	unsigned short		phase3;
-};
-
-#endif /* IIO_DDS_AD9832_H_ */
-- 
2.43.0