[PATCH 27/34] iio: adc: ab8500-gpadc: convert to device properties

From: "Nuno Sá" <nuno.sa@analog.com>
To: <linux-imx@nxp.com>, <linux-renesas-soc@vger.kernel.org>,
	<linux-mips@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<chrome-platform@lists.linux.dev>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	<linux-mediatek@lists.infradead.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-msm@vger.kernel.org>, <linux-iio@vger.kernel.org>,
	<openbmc@lists.ozlabs.org>
Cc: Cai Huoqing <cai.huoqing@linux.dev>,
	Benjamin Fair <benjaminfair@google.com>,
	Jishnu Prakash <quic_jprakash@quicinc.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Amit Kucheria <amitk@kernel.org>, Andy Gross <agross@kernel.org>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Haibo Chen <haibo.chen@nxp.com>,
	Benson Leung <bleung@chromium.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Christophe Branchereau <cbranchereau@gmail.com>,
	Patrick Venture <venture@google.com>,
	Arnd Bergmann <arnd@arndb.de>, Nancy Yuen <yuenn@google.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Gwendal Grignou <gwendal@chromium.org>,
	Saravanan Sekar <sravanhome@gmail.com>,
	Tali Perry <tali.perry1@gmail.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Paul Cercueil <paul@crapouillou.net>,
	Thara Gopinath <thara.gopinath@linaro.org>,
	Avi Fishman <avifishman70@gmail.com>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	Claudiu Beznea <claudiu.beznea@microchip.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Tomer Maimon <tmaimon77@gmail.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Jonathan Cameron <jic23@kernel.org>,
	Zhang Rui <rui.zhang@intel.com>, Shawn Guo <shawnguo@kernel.org>,
	Guenter Roeck <groeck@chromium.org>,
	Fabio Estevam <festevam@gmail.com>,
	Olivier Moysan <olivier.moysan@foss.st.com>,
	Eugen Hristev <eugen.hristev@microchip.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH 27/34] iio: adc: ab8500-gpadc: convert to device properties
Date: Fri, 10 Jun 2022 10:45:38 +0200	[thread overview]
Message-ID: <20220610084545.547700-28-nuno.sa@analog.com> (raw)
In-Reply-To: <20220610084545.547700-1-nuno.sa@analog.com>

Make the conversion to firmware agnostic device properties. As part of
the conversion the IIO inkern interface 'of_xlate()' is also converted to
'fwnode_xlate()'. The goal is to completely drop 'of_xlate' and hence OF
dependencies from IIO.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/iio/adc/ab8500-gpadc.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/adc/ab8500-gpadc.c b/drivers/iio/adc/ab8500-gpadc.c
index 930ce96e6ff5..4fa2126a354b 100644
--- a/drivers/iio/adc/ab8500-gpadc.c
+++ b/drivers/iio/adc/ab8500-gpadc.c
@@ -925,8 +925,8 @@ static int ab8500_gpadc_read_raw(struct iio_dev *indio_dev,
 	return -EINVAL;
 }
 
-static int ab8500_gpadc_of_xlate(struct iio_dev *indio_dev,
-				 const struct of_phandle_args *iiospec)
+static int ab8500_gpadc_fwnode_xlate(struct iio_dev *indio_dev,
+				     const struct fwnode_reference_args *iiospec)
 {
 	int i;
 
@@ -938,7 +938,7 @@ static int ab8500_gpadc_of_xlate(struct iio_dev *indio_dev,
 }
 
 static const struct iio_info ab8500_gpadc_info = {
-	.of_xlate = ab8500_gpadc_of_xlate,
+	.fwnode_xlate = ab8500_gpadc_fwnode_xlate,
 	.read_raw = ab8500_gpadc_read_raw,
 };
 
@@ -968,7 +968,7 @@ static int ab8500_gpadc_runtime_resume(struct device *dev)
 /**
  * ab8500_gpadc_parse_channel() - process devicetree channel configuration
  * @dev: pointer to containing device
- * @np: device tree node for the channel to configure
+ * @fwnode: fw node for the channel to configure
  * @ch: channel info to fill in
  * @iio_chan: IIO channel specification to fill in
  *
@@ -976,15 +976,15 @@ static int ab8500_gpadc_runtime_resume(struct device *dev)
  * and define usage for things like AUX GPADC inputs more precisely.
  */
 static int ab8500_gpadc_parse_channel(struct device *dev,
-				      struct device_node *np,
+				      struct fwnode_handle *fwnode,
 				      struct ab8500_gpadc_chan_info *ch,
 				      struct iio_chan_spec *iio_chan)
 {
-	const char *name = np->name;
+	const char *name = fwnode_get_name(fwnode);
 	u32 chan;
 	int ret;
 
-	ret = of_property_read_u32(np, "reg", &chan);
+	ret = fwnode_property_read_u32(fwnode, "reg", &chan);
 	if (ret) {
 		dev_err(dev, "invalid channel number %s\n", name);
 		return ret;
@@ -1021,22 +1021,20 @@ static int ab8500_gpadc_parse_channel(struct device *dev,
 /**
  * ab8500_gpadc_parse_channels() - Parse the GPADC channels from DT
  * @gpadc: the GPADC to configure the channels for
- * @np: device tree node containing the channel configurations
  * @chans: the IIO channels we parsed
  * @nchans: the number of IIO channels we parsed
  */
 static int ab8500_gpadc_parse_channels(struct ab8500_gpadc *gpadc,
-				       struct device_node *np,
 				       struct iio_chan_spec **chans_parsed,
 				       unsigned int *nchans_parsed)
 {
-	struct device_node *child;
+	struct fwnode_handle *child;
 	struct ab8500_gpadc_chan_info *ch;
 	struct iio_chan_spec *iio_chans;
 	unsigned int nchans;
 	int i;
 
-	nchans = of_get_available_child_count(np);
+	nchans = device_get_child_node_count(gpadc->dev);
 	if (!nchans) {
 		dev_err(gpadc->dev, "no channel children\n");
 		return -ENODEV;
@@ -1054,7 +1052,7 @@ static int ab8500_gpadc_parse_channels(struct ab8500_gpadc *gpadc,
 		return -ENOMEM;
 
 	i = 0;
-	for_each_available_child_of_node(np, child) {
+	device_for_each_child_node(gpadc->dev, child) {
 		struct iio_chan_spec *iio_chan;
 		int ret;
 
@@ -1064,7 +1062,7 @@ static int ab8500_gpadc_parse_channels(struct ab8500_gpadc *gpadc,
 		ret = ab8500_gpadc_parse_channel(gpadc->dev, child, ch,
 						 iio_chan);
 		if (ret) {
-			of_node_put(child);
+			fwnode_handle_put(child);
 			return ret;
 		}
 		i++;
@@ -1081,7 +1079,6 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
 	struct ab8500_gpadc *gpadc;
 	struct iio_dev *indio_dev;
 	struct device *dev = &pdev->dev;
-	struct device_node *np = pdev->dev.of_node;
 	struct iio_chan_spec *iio_chans;
 	unsigned int n_iio_chans;
 	int ret;
@@ -1096,7 +1093,7 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
 	gpadc->dev = dev;
 	gpadc->ab8500 = dev_get_drvdata(dev->parent);
 
-	ret = ab8500_gpadc_parse_channels(gpadc, np, &iio_chans, &n_iio_chans);
+	ret = ab8500_gpadc_parse_channels(gpadc, &iio_chans, &n_iio_chans);
 	if (ret)
 		return ret;
 
-- 
2.36.1

