[RFC PATCH v2 1/3] pinctrl: pinconf-generic: Add ACPI support

From: Irina Tirdea
Date: Tue Apr 05 2016 - 11:34:06 EST

Add ACPI support for the generic device tree properties.
Convert the pinconf generic code to handle both ACPI and
device tree by using the fwnode_property API. Also include
renaming device tree references in names of functions and
structures from 'dt' to 'fwnode'.

Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx>
---
drivers/acpi/property.c | 8 +--
drivers/base/property.c | 36 ++++++++--
drivers/pinctrl/pinconf-generic.c | 121 +++++++++++++++++++-------------
include/linux/acpi.h | 4 +-
include/linux/pinctrl/pinconf-generic.h | 35 +++++----
include/linux/property.h | 9 +++
6 files changed, 138 insertions(+), 75 deletions(-)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index f2fd3fe..b10f935 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -794,13 +794,13 @@ int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname,

/**
* acpi_get_next_subnode - Return the next child node handle for a device.
- * @dev: Device to find the next child node for.
+ * @fwnode: Handle to the device to find the next child node for.
* @child: Handle to one of the device's child nodes or a null handle.
*/
-struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
+struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode,
struct fwnode_handle *child)
{
- struct acpi_device *adev = ACPI_COMPANION(dev);
+ struct acpi_device *adev = to_acpi_device_node(fwnode);
struct list_head *head, *next;

if (!adev)
@@ -816,7 +816,7 @@ struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
next = adev->node.next;
if (next == head) {
child = NULL;
- adev = ACPI_COMPANION(dev);
+ adev = to_acpi_device_node(fwnode);
goto nondev;
}
adev = list_entry(next, struct acpi_device, node);
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 9b1a65d..153a316 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -859,24 +859,37 @@ int device_add_property_set(struct device *dev, const struct property_set *pset)
EXPORT_SYMBOL_GPL(device_add_property_set);

/**
- * device_get_next_child_node - Return the next child node handle for a device
- * @dev: Device to find the next child node for.
+ * fwnode_get_next_child_node - Return the next child node handle for a device
+ * @fwnode: Handle to the device to find the next child node for.
* @child: Handle to one of the device's child nodes or a null handle.
*/
-struct fwnode_handle *device_get_next_child_node(struct device *dev,
+struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
struct fwnode_handle *child)
{
- if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+ if (IS_ENABLED(CONFIG_OF) && to_of_node(fwnode)) {
struct device_node *node;

- node = of_get_next_available_child(dev->of_node, to_of_node(child));
+ node = of_get_next_available_child(to_of_node(fwnode),
+ to_of_node(child));
if (node)
return &node->fwnode;
} else if (IS_ENABLED(CONFIG_ACPI)) {
- return acpi_get_next_subnode(dev, child);
+ return acpi_get_next_subnode(fwnode, child);
}
return NULL;
}
+EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
+
+/**
+ * device_get_next_child_node - Return the next child node handle for a device
+ * @dev: Device to find the next child node for.
+ * @child: Handle to one of the device's child nodes or a null handle.
+ */
+struct fwnode_handle *device_get_next_child_node(struct device *dev,
+ struct fwnode_handle *child)
+{
+ return fwnode_get_next_child_node(dev_fwnode(dev), child);
+}
EXPORT_SYMBOL_GPL(device_get_next_child_node);

/**
@@ -1016,3 +1029,14 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen)
return device_get_mac_addr(dev, "address", addr, alen);
}
EXPORT_SYMBOL(device_get_mac_address);
+
+const char *fwnode_get_name(struct fwnode_handle *fwnode)
+{
+ if (is_of_node(fwnode))
+ return of_node_full_name(to_of_node(fwnode));
+ else if (is_acpi_node(fwnode))
+ return acpi_dev_name(to_acpi_device_node(fwnode));
+
+ return NULL;
+}
+EXPORT_SYMBOL(fwnode_get_name);
diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index d5bf9fa..52ef250 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -21,6 +21,7 @@
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/acpi.h>
#include <linux/of.h>
#include "core.h"
#include "pinconf.h"
@@ -148,8 +149,8 @@ void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif

-#ifdef CONFIG_OF
-static const struct pinconf_generic_params dt_params[] = {
+#if defined(CONFIG_OF) || defined(CONFIG_ACPI)
+static const struct pinconf_generic_params fw_params[] = {
{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
@@ -175,22 +176,22 @@ static const struct pinconf_generic_params dt_params[] = {
};

/**
- * parse_dt_cfg() - Parse DT pinconf parameters
- * @np: DT node
+ * parse_fwnode_cfg() - Parse FW pinconf parameters
+ * @fwnode: FW node
* @params: Array of describing generic parameters
* @count: Number of entries in @params
* @cfg: Array of parsed config options
* @ncfg: Number of entries in @cfg
*
- * Parse the config options described in @params from @np and puts the result
+ * Parse the config options described in @params from @fwnode and puts the result
* in @cfg. @cfg does not need to be empty, entries are added beggining at
* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
* needs to have enough memory allocated to hold all possible entries.
*/
-static void parse_dt_cfg(struct device_node *np,
- const struct pinconf_generic_params *params,
- unsigned int count, unsigned long *cfg,
- unsigned int *ncfg)
+static void parse_fwnode_cfg(struct fwnode_handle *fwnode,
+ const struct pinconf_generic_params *params,
+ unsigned int count, unsigned long *cfg,
+ unsigned int *ncfg)
{
int i;

@@ -199,7 +200,7 @@ static void parse_dt_cfg(struct device_node *np,
int ret;
const struct pinconf_generic_params *par = &params[i];

- ret = of_property_read_u32(np, par->property, &val);
+ ret = fwnode_property_read_u32(fwnode, par->property, &val);

/* property not found */
if (ret == -EINVAL)
@@ -216,38 +217,38 @@ static void parse_dt_cfg(struct device_node *np,
}

/**
- * pinconf_generic_parse_dt_config()
+ * pinconf_generic_parse_fwnode_config()
* parse the config properties into generic pinconfig values.
- * @np: node containing the pinconfig properties
+ * @fwnode: node containing the pinconfig properties
* @configs: array with nconfigs entries containing the generic pinconf values
* must be freed when no longer necessary.
* @nconfigs: umber of configurations
*/
-int pinconf_generic_parse_dt_config(struct device_node *np,
- struct pinctrl_dev *pctldev,
- unsigned long **configs,
- unsigned int *nconfigs)
+static int pinconf_generic_parse_fwnode_config(struct fwnode_handle *fwnode,
+ struct pinctrl_dev *pctldev,
+ unsigned long **configs,
+ unsigned int *nconfigs)
{
unsigned long *cfg;
unsigned int max_cfg, ncfg = 0;
int ret;

- if (!np)
+ if (!fwnode)
return -EINVAL;

/* allocate a temporary array big enough to hold one of each option */
- max_cfg = ARRAY_SIZE(dt_params);
+ max_cfg = ARRAY_SIZE(fw_params);
if (pctldev)
max_cfg += pctldev->desc->num_custom_params;
cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;

- parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
+ parse_fwnode_cfg(fwnode, fw_params, ARRAY_SIZE(fw_params), cfg, &ncfg);
if (pctldev && pctldev->desc->num_custom_params &&
pctldev->desc->custom_params)
- parse_dt_cfg(np, pctldev->desc->custom_params,
- pctldev->desc->num_custom_params, cfg, &ncfg);
+ parse_fwnode_cfg(fwnode, pctldev->desc->custom_params,
+ pctldev->desc->num_custom_params, cfg, &ncfg);

ret = 0;

@@ -275,24 +276,23 @@ out:
return ret;
}

-int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
- struct device_node *np, struct pinctrl_map **map,
+static int pinconf_generic_fwnode_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct fwnode_handle *fwnode, struct pinctrl_map **map,
unsigned *reserved_maps, unsigned *num_maps,
enum pinctrl_map_type type)
{
- int ret;
const char *function;
struct device *dev = pctldev->dev;
unsigned long *configs = NULL;
unsigned num_configs = 0;
unsigned reserve, strings_count;
- struct property *prop;
- const char *group;
+ const char **groups;
const char *subnode_target_type = "pins";
+ int ret, i;

- ret = of_property_count_strings(np, "pins");
+ ret = fwnode_property_read_string_array(fwnode, "pins", NULL, 0);
if (ret < 0) {
- ret = of_property_count_strings(np, "groups");
+ ret = fwnode_property_read_string_array(fwnode, "groups", NULL, 0);
if (ret < 0)
/* skip this node; may contain config child nodes */
return 0;
@@ -305,20 +305,20 @@ int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
}
strings_count = ret;

- ret = of_property_read_string(np, "function", &function);
+ ret = fwnode_property_read_string(fwnode, "function", &function);
if (ret < 0) {
/* EINVAL=missing, which is fine since it's optional */
if (ret != -EINVAL)
dev_err(dev, "%s: could not parse property function\n",
- of_node_full_name(np));
+ fwnode_get_name(fwnode));
function = NULL;
}

- ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
- &num_configs);
+ ret = pinconf_generic_parse_fwnode_config(fwnode, pctldev, &configs,
+ &num_configs);
if (ret < 0) {
dev_err(dev, "%s: could not parse node property\n",
- of_node_full_name(np));
+ fwnode_get_name(fwnode));
return ret;
}

@@ -333,52 +333,64 @@ int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
num_maps, reserve);
if (ret < 0)
- goto exit;
+ goto exit_free_configs;
+
+ groups = kcalloc(strings_count, sizeof(*groups), GFP_KERNEL);
+ if (!groups) {
+ ret = -ENOMEM;
+ goto exit_free_configs;
+ }
+
+ ret = fwnode_property_read_string_array(fwnode, subnode_target_type,
+ groups, strings_count);
+ if (ret < 0)
+ goto exit_free_groups;

- of_property_for_each_string(np, subnode_target_type, prop, group) {
+ for (i = 0; i < strings_count; i++) {
if (function) {
ret = pinctrl_utils_add_map_mux(pctldev, map,
- reserved_maps, num_maps, group,
+ reserved_maps, num_maps, groups[i],
function);
if (ret < 0)
- goto exit;
+ goto exit_free_groups;
}

if (num_configs) {
ret = pinctrl_utils_add_map_configs(pctldev, map,
- reserved_maps, num_maps, group, configs,
- num_configs, type);
+ reserved_maps, num_maps, groups[i],
+ configs, num_configs, type);
if (ret < 0)
- goto exit;
+ goto exit_free_groups;
}
}
ret = 0;

-exit:
+exit_free_groups:
+ kfree(groups);
+exit_free_configs:
kfree(configs);
return ret;
}
-EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);

-int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
- struct device_node *np_config, struct pinctrl_map **map,
+int pinconf_generic_fwnode_to_map(struct pinctrl_dev *pctldev,
+ struct fwnode_handle *fwnode, struct pinctrl_map **map,
unsigned *num_maps, enum pinctrl_map_type type)
{
unsigned reserved_maps;
- struct device_node *np;
+ struct fwnode_handle *fw;
int ret;

reserved_maps = 0;
*map = NULL;
*num_maps = 0;

- ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
+ ret = pinconf_generic_fwnode_subnode_to_map(pctldev, fwnode, map,
&reserved_maps, num_maps, type);
if (ret < 0)
goto exit;

- for_each_child_of_node(np_config, np) {
- ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
+ fwnode_for_each_child_node(fwnode, fw) {
+ ret = pinconf_generic_fwnode_subnode_to_map(pctldev, fw, map,
&reserved_maps, num_maps, type);
if (ret < 0)
goto exit;
@@ -389,6 +401,17 @@ exit:
pinctrl_utils_free_map(pctldev, *map, *num_maps);
return ret;
}
-EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
+EXPORT_SYMBOL_GPL(pinconf_generic_fwnode_to_map);
+
+#endif

+#ifdef CONFIG_OF
+int pinconf_generic_parse_dt_config(struct device_node *np,
+ struct pinctrl_dev *pctldev,
+ unsigned long **configs,
+ unsigned int *nconfigs)
+{
+ return pinconf_generic_parse_fwnode_config(&np->fwnode, pctldev,
+ configs, nconfigs);
+}
#endif
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 06ed7e5..78a1050 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -876,7 +876,7 @@ int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname,
int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
enum dev_prop_type proptype, void *val, size_t nval);

-struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
+struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode,
struct fwnode_handle *subnode);

struct acpi_probe_entry;
@@ -986,7 +986,7 @@ static inline int acpi_dev_prop_read(struct acpi_device *adev,
return -ENXIO;
}

-static inline struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
+static inline struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode,
struct fwnode_handle *subnode)
{
return NULL;
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index d921afd..6a8ea74 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -155,8 +155,7 @@ static inline unsigned long pinconf_to_config_packed(enum pin_config_param param
return PIN_CONF_PACKED(param, argument);
}

-#ifdef CONFIG_OF
-
+#if defined(CONFIG_OF) || defined(CONFIG_ACPI)
#include <linux/device.h>
#include <linux/pinctrl/machine.h>
struct pinctrl_dev;
@@ -168,28 +167,36 @@ struct pinconf_generic_params {
u32 default_value;
};

-int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
- struct device_node *np, struct pinctrl_map **map,
- unsigned *reserved_maps, unsigned *num_maps,
- enum pinctrl_map_type type);
-int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
- struct device_node *np_config, struct pinctrl_map **map,
+int pinconf_generic_fwnode_to_map(struct pinctrl_dev *pctldev,
+ struct fwnode_handle *fwnode, struct pinctrl_map **map,
unsigned *num_maps, enum pinctrl_map_type type);
+#endif
+
+#ifdef CONFIG_OF
+#include <linux/of.h>
+
+static inline int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config, struct pinctrl_map **map,
+ unsigned *num_maps, enum pinctrl_map_type type)
+{
+ return pinconf_generic_fwnode_to_map(pctldev, &np_config->fwnode, map,
+ num_maps, type);
+}

static inline int pinconf_generic_dt_node_to_map_group(
struct pinctrl_dev *pctldev, struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps)
{
- return pinconf_generic_dt_node_to_map(pctldev, np_config, map, num_maps,
- PIN_MAP_TYPE_CONFIGS_GROUP);
+ return pinconf_generic_fwnode_to_map(pctldev, &np_config->fwnode, map,
+ num_maps, PIN_MAP_TYPE_CONFIGS_GROUP);
}

static inline int pinconf_generic_dt_node_to_map_pin(
struct pinctrl_dev *pctldev, struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps)
{
- return pinconf_generic_dt_node_to_map(pctldev, np_config, map, num_maps,
- PIN_MAP_TYPE_CONFIGS_PIN);
+ return pinconf_generic_fwnode_to_map(pctldev, &np_config->fwnode, map,
+ num_maps, PIN_MAP_TYPE_CONFIGS_PIN);
}

static inline int pinconf_generic_dt_node_to_map_all(
@@ -200,8 +207,8 @@ static inline int pinconf_generic_dt_node_to_map_all(
* passing the type as PIN_MAP_TYPE_INVALID causes the underlying parser
* to infer the map type from the DT properties used.
*/
- return pinconf_generic_dt_node_to_map(pctldev, np_config, map, num_maps,
- PIN_MAP_TYPE_INVALID);
+ return pinconf_generic_fwnode_to_map(pctldev, &np_config->fwnode, map,
+ num_maps, PIN_MAP_TYPE_INVALID);
}
#endif

diff --git a/include/linux/property.h b/include/linux/property.h
index b51fcd3..b0868d0 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -70,9 +70,16 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
int fwnode_property_match_string(struct fwnode_handle *fwnode,
const char *propname, const char *string);

+struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
+ struct fwnode_handle *child);
+
struct fwnode_handle *device_get_next_child_node(struct device *dev,
struct fwnode_handle *child);

+#define fwnode_for_each_child_node(fwnode, child) \
+ for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
+ child = fwnode_get_next_child_node(fwnode, child))
+
#define device_for_each_child_node(dev, child) \
for (child = device_get_next_child_node(dev, NULL); child; \
child = device_get_next_child_node(dev, child))
@@ -259,4 +266,6 @@ int device_get_phy_mode(struct device *dev);

void *device_get_mac_address(struct device *dev, char *addr, int alen);

+const char *fwnode_get_name(struct fwnode_handle *fwnode);
+
#endif /* _LINUX_PROPERTY_H_ */
--
1.9.1