drivers/soundwire/mipi_disco.c - linux - Git at Google

 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 // Copyright(c) 2015-17 Intel Corporation.

 /*
  * MIPI Discovery And Configuration (DisCo) Specification for SoundWire
  * specifies properties to be implemented for SoundWire Masters and Slaves.
  * The DisCo spec doesn't mandate these properties. However, SDW bus cannot
  * work without knowing these values.
  *
  * The helper functions read the Master and Slave properties. Implementers
  * of Master or Slave drivers can use any of the below three mechanisms:
  *    a) Use these APIs here as .read_prop() callback for Master and Slave
  *    b) Implement own methods and set those as .read_prop(), but invoke
  *    APIs in this file for generic read and override the values with
  *    platform specific data
  *    c) Implement ones own methods which do not use anything provided
  *    here
  */

 #include <linux/device.h>
 #include <linux/property.h>
 #include <linux/mod_devicetable.h>
 #include <linux/soundwire/sdw.h>
 #include "bus.h"

 /**
  * sdw_master_read_prop() - Read Master properties
  * @bus: SDW bus instance
  */
 int sdw_master_read_prop(struct sdw_bus *bus)
 {
 	struct sdw_master_prop *prop = &bus->prop;
 	struct fwnode_handle *link;
 	char name[32];
 	int nval, i;

 	device_property_read_u32(bus->dev,
 				 "mipi-sdw-sw-interface-revision",
 				 &prop->revision);

 	/* Find master handle */
 	snprintf(name, sizeof(name),
 		 "mipi-sdw-link-%d-subproperties", bus->link_id);

 	link = device_get_named_child_node(bus->dev, name);
 	if (!link) {
 		dev_err(bus->dev, "Master node %s not found\n", name);
 		return -EIO;
 	}

 	if (fwnode_property_read_bool(link,
 				      "mipi-sdw-clock-stop-mode0-supported"))
 		prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE0);

 	if (fwnode_property_read_bool(link,
 				      "mipi-sdw-clock-stop-mode1-supported"))
 		prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE1);

 	fwnode_property_read_u32(link,
 				 "mipi-sdw-max-clock-frequency",
 				 &prop->max_clk_freq);

 	nval = fwnode_property_count_u32(link, "mipi-sdw-clock-frequencies-supported");
 	if (nval > 0) {
 		prop->num_clk_freq = nval;
 		prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq,
 					      sizeof(*prop->clk_freq),
 					      GFP_KERNEL);
 		if (!prop->clk_freq)
 			return -ENOMEM;

 		fwnode_property_read_u32_array(link,
 				"mipi-sdw-clock-frequencies-supported",
 				prop->clk_freq, prop->num_clk_freq);
 	}

 	/*
 	 * Check the frequencies supported. If FW doesn't provide max
 	 * freq, then populate here by checking values.
 	 */
 	if (!prop->max_clk_freq && prop->clk_freq) {
 		prop->max_clk_freq = prop->clk_freq[0];
 		for (i = 1; i < prop->num_clk_freq; i++) {
 			if (prop->clk_freq[i] > prop->max_clk_freq)
 				prop->max_clk_freq = prop->clk_freq[i];
 		}
 	}

 	nval = fwnode_property_count_u32(link, "mipi-sdw-supported-clock-gears");
 	if (nval > 0) {
 		prop->num_clk_gears = nval;
 		prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
 					       sizeof(*prop->clk_gears),
 					       GFP_KERNEL);
 		if (!prop->clk_gears)
 			return -ENOMEM;

 		fwnode_property_read_u32_array(link,
 					       "mipi-sdw-supported-clock-gears",
 					       prop->clk_gears,
 					       prop->num_clk_gears);
 	}

 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
 				 &prop->default_frame_rate);

 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
 				 &prop->default_row);

 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
 				 &prop->default_col);

 	prop->dynamic_frame =  fwnode_property_read_bool(link,
 			"mipi-sdw-dynamic-frame-shape");

 	fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
 				 &prop->err_threshold);

 	return 0;
 }
 EXPORT_SYMBOL(sdw_master_read_prop);

 static int sdw_slave_read_dp0(struct sdw_slave *slave,
 			      struct fwnode_handle *port,
 			      struct sdw_dp0_prop *dp0)
 {
 	int nval;

 	fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
 				 &dp0->max_word);

 	fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
 				 &dp0->min_word);

 	nval = fwnode_property_count_u32(port, "mipi-sdw-port-wordlength-configs");
 	if (nval > 0) {

 		dp0->num_words = nval;
 		dp0->words = devm_kcalloc(&slave->dev,
 					  dp0->num_words, sizeof(*dp0->words),
 					  GFP_KERNEL);
 		if (!dp0->words)
 			return -ENOMEM;

 		fwnode_property_read_u32_array(port,
 				"mipi-sdw-port-wordlength-configs",
 				dp0->words, dp0->num_words);
 	}

 	dp0->BRA_flow_controlled = fwnode_property_read_bool(port,
 				"mipi-sdw-bra-flow-controlled");

 	dp0->simple_ch_prep_sm = fwnode_property_read_bool(port,
 				"mipi-sdw-simplified-channel-prepare-sm");

 	dp0->imp_def_interrupts = fwnode_property_read_bool(port,
 				"mipi-sdw-imp-def-dp0-interrupts-supported");

 	return 0;
 }

 static int sdw_slave_read_dpn(struct sdw_slave *slave,
 			      struct sdw_dpn_prop *dpn, int count, int ports,
 			      char *type)
 {
 	struct fwnode_handle *node;
 	u32 bit, i = 0;
 	int nval;
 	unsigned long addr;
 	char name[40];

 	addr = ports;
 	/* valid ports are 1 to 14 so apply mask */
 	addr &= GENMASK(14, 1);

 	for_each_set_bit(bit, &addr, 32) {
 		snprintf(name, sizeof(name),
 			 "mipi-sdw-dp-%d-%s-subproperties", bit, type);

 		dpn[i].num = bit;

 		node = device_get_named_child_node(&slave->dev, name);
 		if (!node) {
 			dev_err(&slave->dev, "%s dpN not found\n", name);
 			return -EIO;
 		}

 		fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
 					 &dpn[i].max_word);
 		fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
 					 &dpn[i].min_word);

 		nval = fwnode_property_count_u32(node, "mipi-sdw-port-wordlength-configs");
 		if (nval > 0) {
 			dpn[i].num_words = nval;
 			dpn[i].words = devm_kcalloc(&slave->dev,
 						    dpn[i].num_words,
 						    sizeof(*dpn[i].words),
 						    GFP_KERNEL);
 			if (!dpn[i].words)
 				return -ENOMEM;

 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-port-wordlength-configs",
 					dpn[i].words, dpn[i].num_words);
 		}

 		fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
 					 &dpn[i].type);

 		fwnode_property_read_u32(node,
 					 "mipi-sdw-max-grouping-supported",
 					 &dpn[i].max_grouping);

 		dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
 				"mipi-sdw-simplified-channelprepare-sm");

 		fwnode_property_read_u32(node,
 					 "mipi-sdw-port-channelprepare-timeout",
 					 &dpn[i].ch_prep_timeout);

 		fwnode_property_read_u32(node,
 				"mipi-sdw-imp-def-dpn-interrupts-supported",
 				&dpn[i].imp_def_interrupts);

 		fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
 					 &dpn[i].min_ch);

 		fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
 					 &dpn[i].max_ch);

 		nval = fwnode_property_count_u32(node, "mipi-sdw-channel-number-list");
 		if (nval > 0) {
 			dpn[i].num_ch = nval;
 			dpn[i].ch = devm_kcalloc(&slave->dev, dpn[i].num_ch,
 						 sizeof(*dpn[i].ch),
 						 GFP_KERNEL);
 			if (!dpn[i].ch)
 				return -ENOMEM;

 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-channel-number-list",
 					dpn[i].ch, dpn[i].num_ch);
 		}

 		nval = fwnode_property_count_u32(node, "mipi-sdw-channel-combination-list");
 		if (nval > 0) {
 			dpn[i].num_ch_combinations = nval;
 			dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
 					dpn[i].num_ch_combinations,
 					sizeof(*dpn[i].ch_combinations),
 					GFP_KERNEL);
 			if (!dpn[i].ch_combinations)
 				return -ENOMEM;

 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-channel-combination-list",
 					dpn[i].ch_combinations,
 					dpn[i].num_ch_combinations);
 		}

 		fwnode_property_read_u32(node,
 				"mipi-sdw-modes-supported", &dpn[i].modes);

 		fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
 					 &dpn[i].max_async_buffer);

 		dpn[i].block_pack_mode = fwnode_property_read_bool(node,
 				"mipi-sdw-block-packing-mode");

 		fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
 					 &dpn[i].port_encoding);

 		/* TODO: Read audio mode */

 		i++;
 	}

 	return 0;
 }

 /**
  * sdw_slave_read_prop() - Read Slave properties
  * @slave: SDW Slave
  */
 int sdw_slave_read_prop(struct sdw_slave *slave)
 {
 	struct sdw_slave_prop *prop = &slave->prop;
 	struct device *dev = &slave->dev;
 	struct fwnode_handle *port;
 	int num_of_ports, nval, i, dp0 = 0;

 	device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
 				 &prop->mipi_revision);

 	prop->wake_capable = device_property_read_bool(dev,
 				"mipi-sdw-wake-up-unavailable");
 	prop->wake_capable = !prop->wake_capable;

 	prop->test_mode_capable = device_property_read_bool(dev,
 				"mipi-sdw-test-mode-supported");

 	prop->clk_stop_mode1 = false;
 	if (device_property_read_bool(dev,
 				"mipi-sdw-clock-stop-mode1-supported"))
 		prop->clk_stop_mode1 = true;

 	prop->simple_clk_stop_capable = device_property_read_bool(dev,
 			"mipi-sdw-simplified-clockstopprepare-sm-supported");

 	device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
 				 &prop->clk_stop_timeout);

 	device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
 				 &prop->ch_prep_timeout);

 	device_property_read_u32(dev,
 			"mipi-sdw-clockstopprepare-hard-reset-behavior",
 			&prop->reset_behave);

 	prop->high_PHY_capable = device_property_read_bool(dev,
 			"mipi-sdw-highPHY-capable");

 	prop->paging_support = device_property_read_bool(dev,
 			"mipi-sdw-paging-support");

 	prop->bank_delay_support = device_property_read_bool(dev,
 			"mipi-sdw-bank-delay-support");

 	device_property_read_u32(dev,
 			"mipi-sdw-port15-read-behavior", &prop->p15_behave);

 	device_property_read_u32(dev, "mipi-sdw-master-count",
 				 &prop->master_count);

 	device_property_read_u32(dev, "mipi-sdw-source-port-list",
 				 &prop->source_ports);

 	device_property_read_u32(dev, "mipi-sdw-sink-port-list",
 				 &prop->sink_ports);

 	/* Read dp0 properties */
 	port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
 	if (!port) {
 		dev_dbg(dev, "DP0 node not found!!\n");
 	} else {
 		prop->dp0_prop = devm_kzalloc(&slave->dev,
 					      sizeof(*prop->dp0_prop),
 					      GFP_KERNEL);
 		if (!prop->dp0_prop)
 			return -ENOMEM;

 		sdw_slave_read_dp0(slave, port, prop->dp0_prop);
 		dp0 = 1;
 	}

 	/*
 	 * Based on each DPn port, get source and sink dpn properties.
 	 * Also, some ports can operate as both source or sink.
 	 */

 	/* Allocate memory for set bits in port lists */
 	nval = hweight32(prop->source_ports);
 	prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
 					  sizeof(*prop->src_dpn_prop),
 					  GFP_KERNEL);
 	if (!prop->src_dpn_prop)
 		return -ENOMEM;

 	/* Read dpn properties for source port(s) */
 	sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
 			   prop->source_ports, "source");

 	nval = hweight32(prop->sink_ports);
 	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
 					   sizeof(*prop->sink_dpn_prop),
 					   GFP_KERNEL);
 	if (!prop->sink_dpn_prop)
 		return -ENOMEM;

 	/* Read dpn properties for sink port(s) */
 	sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval,
 			   prop->sink_ports, "sink");

 	/* some ports are bidirectional so check total ports by ORing */
 	nval = prop->source_ports | prop->sink_ports;
 	num_of_ports = hweight32(nval) + dp0; /* add DP0 */

 	/* Allocate port_ready based on num_of_ports */
 	slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
 					 sizeof(*slave->port_ready),
 					 GFP_KERNEL);
 	if (!slave->port_ready)
 		return -ENOMEM;

 	/* Initialize completion */
 	for (i = 0; i < num_of_ports; i++)
 		init_completion(&slave->port_ready[i]);

 	return 0;
 }
 EXPORT_SYMBOL(sdw_slave_read_prop);
	// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
	// Copyright(c) 2015-17 Intel Corporation.

	/*
	* MIPI Discovery And Configuration (DisCo) Specification for SoundWire
	* specifies properties to be implemented for SoundWire Masters and Slaves.
	* The DisCo spec doesn't mandate these properties. However, SDW bus cannot
	* work without knowing these values.
	*
	* The helper functions read the Master and Slave properties. Implementers
	* of Master or Slave drivers can use any of the below three mechanisms:
	* a) Use these APIs here as .read_prop() callback for Master and Slave
	* b) Implement own methods and set those as .read_prop(), but invoke
	* APIs in this file for generic read and override the values with
	* platform specific data
	* c) Implement ones own methods which do not use anything provided
	* here
	*/

	#include <linux/device.h>
	#include <linux/property.h>
	#include <linux/mod_devicetable.h>
	#include <linux/soundwire/sdw.h>
	#include "bus.h"

	/**
	* sdw_master_read_prop() - Read Master properties
	* @bus: SDW bus instance
	*/
	int sdw_master_read_prop(struct sdw_bus *bus)
	{
	struct sdw_master_prop *prop = &bus->prop;
	struct fwnode_handle *link;
	char name[32];
	int nval, i;

	device_property_read_u32(bus->dev,
	"mipi-sdw-sw-interface-revision",
	&prop->revision);

	/* Find master handle */
	snprintf(name, sizeof(name),
	"mipi-sdw-link-%d-subproperties", bus->link_id);

	link = device_get_named_child_node(bus->dev, name);
	if (!link) {
	dev_err(bus->dev, "Master node %s not found\n", name);
	return -EIO;
	}

	if (fwnode_property_read_bool(link,
	"mipi-sdw-clock-stop-mode0-supported"))
	prop->clk_stop_modes \|= BIT(SDW_CLK_STOP_MODE0);

	if (fwnode_property_read_bool(link,
	"mipi-sdw-clock-stop-mode1-supported"))
	prop->clk_stop_modes \|= BIT(SDW_CLK_STOP_MODE1);

	fwnode_property_read_u32(link,
	"mipi-sdw-max-clock-frequency",
	&prop->max_clk_freq);

	nval = fwnode_property_count_u32(link, "mipi-sdw-clock-frequencies-supported");
	if (nval > 0) {
	prop->num_clk_freq = nval;
	prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq,
	sizeof(*prop->clk_freq),
	GFP_KERNEL);
	if (!prop->clk_freq)
	return -ENOMEM;

	fwnode_property_read_u32_array(link,
	"mipi-sdw-clock-frequencies-supported",
	prop->clk_freq, prop->num_clk_freq);
	}

	/*
	* Check the frequencies supported. If FW doesn't provide max
	* freq, then populate here by checking values.
	*/
	if (!prop->max_clk_freq && prop->clk_freq) {
	prop->max_clk_freq = prop->clk_freq[0];
	for (i = 1; i < prop->num_clk_freq; i++) {
	if (prop->clk_freq[i] > prop->max_clk_freq)
	prop->max_clk_freq = prop->clk_freq[i];
	}
	}

	nval = fwnode_property_count_u32(link, "mipi-sdw-supported-clock-gears");
	if (nval > 0) {
	prop->num_clk_gears = nval;
	prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
	sizeof(*prop->clk_gears),
	GFP_KERNEL);
	if (!prop->clk_gears)
	return -ENOMEM;

	fwnode_property_read_u32_array(link,
	"mipi-sdw-supported-clock-gears",
	prop->clk_gears,
	prop->num_clk_gears);
	}

	fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
	&prop->default_frame_rate);

	fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
	&prop->default_row);

	fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
	&prop->default_col);

	prop->dynamic_frame = fwnode_property_read_bool(link,
	"mipi-sdw-dynamic-frame-shape");

	fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
	&prop->err_threshold);

	return 0;
	}
	EXPORT_SYMBOL(sdw_master_read_prop);

	static int sdw_slave_read_dp0(struct sdw_slave *slave,
	struct fwnode_handle *port,
	struct sdw_dp0_prop *dp0)
	{
	int nval;

	fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
	&dp0->max_word);

	fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
	&dp0->min_word);

	nval = fwnode_property_count_u32(port, "mipi-sdw-port-wordlength-configs");
	if (nval > 0) {

	dp0->num_words = nval;
	dp0->words = devm_kcalloc(&slave->dev,
	dp0->num_words, sizeof(*dp0->words),
	GFP_KERNEL);
	if (!dp0->words)
	return -ENOMEM;

	fwnode_property_read_u32_array(port,
	"mipi-sdw-port-wordlength-configs",
	dp0->words, dp0->num_words);
	}

	dp0->BRA_flow_controlled = fwnode_property_read_bool(port,
	"mipi-sdw-bra-flow-controlled");

	dp0->simple_ch_prep_sm = fwnode_property_read_bool(port,
	"mipi-sdw-simplified-channel-prepare-sm");

	dp0->imp_def_interrupts = fwnode_property_read_bool(port,
	"mipi-sdw-imp-def-dp0-interrupts-supported");

	return 0;
	}

	static int sdw_slave_read_dpn(struct sdw_slave *slave,
	struct sdw_dpn_prop *dpn, int count, int ports,
	char *type)
	{
	struct fwnode_handle *node;
	u32 bit, i = 0;
	int nval;
	unsigned long addr;
	char name[40];

	addr = ports;
	/* valid ports are 1 to 14 so apply mask */
	addr &= GENMASK(14, 1);

	for_each_set_bit(bit, &addr, 32) {
	snprintf(name, sizeof(name),
	"mipi-sdw-dp-%d-%s-subproperties", bit, type);

	dpn[i].num = bit;

	node = device_get_named_child_node(&slave->dev, name);
	if (!node) {
	dev_err(&slave->dev, "%s dpN not found\n", name);
	return -EIO;
	}

	fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
	&dpn[i].max_word);
	fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
	&dpn[i].min_word);

	nval = fwnode_property_count_u32(node, "mipi-sdw-port-wordlength-configs");
	if (nval > 0) {
	dpn[i].num_words = nval;
	dpn[i].words = devm_kcalloc(&slave->dev,
	dpn[i].num_words,
	sizeof(*dpn[i].words),
	GFP_KERNEL);
	if (!dpn[i].words)
	return -ENOMEM;

	fwnode_property_read_u32_array(node,
	"mipi-sdw-port-wordlength-configs",
	dpn[i].words, dpn[i].num_words);
	}

	fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
	&dpn[i].type);

	fwnode_property_read_u32(node,
	"mipi-sdw-max-grouping-supported",
	&dpn[i].max_grouping);

	dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
	"mipi-sdw-simplified-channelprepare-sm");

	fwnode_property_read_u32(node,
	"mipi-sdw-port-channelprepare-timeout",
	&dpn[i].ch_prep_timeout);

	fwnode_property_read_u32(node,
	"mipi-sdw-imp-def-dpn-interrupts-supported",
	&dpn[i].imp_def_interrupts);

	fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
	&dpn[i].min_ch);

	fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
	&dpn[i].max_ch);

	nval = fwnode_property_count_u32(node, "mipi-sdw-channel-number-list");
	if (nval > 0) {
	dpn[i].num_ch = nval;
	dpn[i].ch = devm_kcalloc(&slave->dev, dpn[i].num_ch,
	sizeof(*dpn[i].ch),
	GFP_KERNEL);
	if (!dpn[i].ch)
	return -ENOMEM;

	fwnode_property_read_u32_array(node,
	"mipi-sdw-channel-number-list",
	dpn[i].ch, dpn[i].num_ch);
	}

	nval = fwnode_property_count_u32(node, "mipi-sdw-channel-combination-list");
	if (nval > 0) {
	dpn[i].num_ch_combinations = nval;
	dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
	dpn[i].num_ch_combinations,
	sizeof(*dpn[i].ch_combinations),
	GFP_KERNEL);
	if (!dpn[i].ch_combinations)
	return -ENOMEM;

	fwnode_property_read_u32_array(node,
	"mipi-sdw-channel-combination-list",
	dpn[i].ch_combinations,
	dpn[i].num_ch_combinations);
	}

	fwnode_property_read_u32(node,
	"mipi-sdw-modes-supported", &dpn[i].modes);

	fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
	&dpn[i].max_async_buffer);

	dpn[i].block_pack_mode = fwnode_property_read_bool(node,
	"mipi-sdw-block-packing-mode");

	fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
	&dpn[i].port_encoding);

	/* TODO: Read audio mode */

	i++;
	}

	return 0;
	}

	/**
	* sdw_slave_read_prop() - Read Slave properties
	* @slave: SDW Slave
	*/
	int sdw_slave_read_prop(struct sdw_slave *slave)
	{
	struct sdw_slave_prop *prop = &slave->prop;
	struct device *dev = &slave->dev;
	struct fwnode_handle *port;
	int num_of_ports, nval, i, dp0 = 0;

	device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
	&prop->mipi_revision);

	prop->wake_capable = device_property_read_bool(dev,
	"mipi-sdw-wake-up-unavailable");
	prop->wake_capable = !prop->wake_capable;

	prop->test_mode_capable = device_property_read_bool(dev,
	"mipi-sdw-test-mode-supported");

	prop->clk_stop_mode1 = false;
	if (device_property_read_bool(dev,
	"mipi-sdw-clock-stop-mode1-supported"))
	prop->clk_stop_mode1 = true;

	prop->simple_clk_stop_capable = device_property_read_bool(dev,
	"mipi-sdw-simplified-clockstopprepare-sm-supported");

	device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
	&prop->clk_stop_timeout);

	device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
	&prop->ch_prep_timeout);

	device_property_read_u32(dev,
	"mipi-sdw-clockstopprepare-hard-reset-behavior",
	&prop->reset_behave);

	prop->high_PHY_capable = device_property_read_bool(dev,
	"mipi-sdw-highPHY-capable");

	prop->paging_support = device_property_read_bool(dev,
	"mipi-sdw-paging-support");

	prop->bank_delay_support = device_property_read_bool(dev,
	"mipi-sdw-bank-delay-support");

	device_property_read_u32(dev,
	"mipi-sdw-port15-read-behavior", &prop->p15_behave);

	device_property_read_u32(dev, "mipi-sdw-master-count",
	&prop->master_count);

	device_property_read_u32(dev, "mipi-sdw-source-port-list",
	&prop->source_ports);

	device_property_read_u32(dev, "mipi-sdw-sink-port-list",
	&prop->sink_ports);

	/* Read dp0 properties */
	port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
	if (!port) {
	dev_dbg(dev, "DP0 node not found!!\n");
	} else {
	prop->dp0_prop = devm_kzalloc(&slave->dev,
	sizeof(*prop->dp0_prop),
	GFP_KERNEL);
	if (!prop->dp0_prop)
	return -ENOMEM;

	sdw_slave_read_dp0(slave, port, prop->dp0_prop);
	dp0 = 1;
	}

	/*
	* Based on each DPn port, get source and sink dpn properties.
	* Also, some ports can operate as both source or sink.
	*/

	/* Allocate memory for set bits in port lists */
	nval = hweight32(prop->source_ports);
	prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
	sizeof(*prop->src_dpn_prop),
	GFP_KERNEL);
	if (!prop->src_dpn_prop)
	return -ENOMEM;

	/* Read dpn properties for source port(s) */
	sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
	prop->source_ports, "source");

	nval = hweight32(prop->sink_ports);
	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
	sizeof(*prop->sink_dpn_prop),
	GFP_KERNEL);
	if (!prop->sink_dpn_prop)
	return -ENOMEM;

	/* Read dpn properties for sink port(s) */
	sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval,
	prop->sink_ports, "sink");

	/* some ports are bidirectional so check total ports by ORing */
	nval = prop->source_ports \| prop->sink_ports;
	num_of_ports = hweight32(nval) + dp0; /* add DP0 */

	/* Allocate port_ready based on num_of_ports */
	slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
	sizeof(*slave->port_ready),
	GFP_KERNEL);
	if (!slave->port_ready)
	return -ENOMEM;

	/* Initialize completion */
	for (i = 0; i < num_of_ports; i++)
	init_completion(&slave->port_ready[i]);

	return 0;
	}
	EXPORT_SYMBOL(sdw_slave_read_prop);