[PATCH v2 2/7] pinctrl: pinconf-generic: Allow driver to specify DT params

From: Soren Brinkmann
Date: Thu Nov 27 2014 - 20:27:21 EST

Additionally to the generic DT parameters, allow drivers to provide
driver-specific DT parameters to be used with the generic parser
infrastructure.

To achieve this 'struct pinctrl_desc' is extended to pass custom pinconf
option to the core. In order to pass this kind of information, the
related data structures - 'struct pinconf_generic_dt_params',
'pin_config_item' - are moved from pinconf internals to the
pinconf-generic header.

Additionally pinconfg-generic is refactored to not only iterate over the
generic pinconf parameters but also take the parameters into account
that are provided through the driver's 'struct pinctrl_desc'.
In particular 'pinconf_generic_parse_dt_config()' and
'pinconf_generic_dump' helpers are split into two parts each. In order
to have a more generic helper that can be used to process the generic
parameters as well as the driver-specific ones.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx>
Tested-by: Andreas FÃrber <afaerber@xxxxxxx>
---
v2:
- fix typo
- add missing documentation for @conf_items member in struct
- rebase to pinctrl/devel: conflict in abx500
- rename _pinconf_generic_dump() to pinconf_generic_dump_one()
- removed '_' from _parse_dt_cfg()
- removed BUG_ONs, error condition is handled in if statements
- removed pinconf_generic_dump_group() & pinconf_generic_dump_pin
helpers
- fixed up corresponding call sites
- renamed pinconf_generic_dump() to pinconf_generic_dump_pins()
- added kernel-doc to pinconf_generic_dump_pins()
- add kernel-doc
- more verbose commit message
---
drivers/pinctrl/nomadik/pinctrl-abx500.c | 2 +-
drivers/pinctrl/pinconf-generic.c | 182 +++++++++++++++++--------------
drivers/pinctrl/pinconf.c | 4 +-
drivers/pinctrl/pinconf.h | 22 ++--
drivers/pinctrl/pinctrl-rockchip.c | 2 +-
drivers/pinctrl/pinctrl-tz1090-pdc.c | 2 +-
drivers/pinctrl/pinctrl-tz1090.c | 2 +-
drivers/pinctrl/sh-pfc/pinctrl.c | 2 +-
include/linux/pinctrl/pinconf-generic.h | 18 +++
include/linux/pinctrl/pinctrl.h | 9 ++
10 files changed, 141 insertions(+), 104 deletions(-)

diff --git a/drivers/pinctrl/nomadik/pinctrl-abx500.c b/drivers/pinctrl/nomadik/pinctrl-abx500.c
index e1087c75e4f4..de68c1f8477b 100644
--- a/drivers/pinctrl/nomadik/pinctrl-abx500.c
+++ b/drivers/pinctrl/nomadik/pinctrl-abx500.c
@@ -914,7 +914,7 @@ static int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev,
}
}

- ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs);
+ ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &nconfigs);
if (nconfigs) {
const char *gpio_name;
const char *pin;
diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index 1e782a0d6e48..ac1dcf1925ba 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -27,17 +27,6 @@
#include "pinctrl-utils.h"

#ifdef CONFIG_DEBUG_FS
-
-struct pin_config_item {
- const enum pin_config_param param;
- const char * const display;
- const char * const format;
- bool has_arg;
-};
-
-#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
- .has_arg = d }
-
static const struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
@@ -60,22 +49,25 @@ static const struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
};

-void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
- struct seq_file *s, unsigned pin)
+static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
+ struct seq_file *s, const char *gname,
+ unsigned pin,
+ const struct pin_config_item *items,
+ int nitems)
{
- const struct pinconf_ops *ops = pctldev->desc->confops;
int i;

- if (!ops->is_generic)
- return;
-
- for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
+ for (i = 0; i < nitems; i++) {
unsigned long config;
int ret;

/* We want to check out this parameter */
- config = pinconf_to_config_packed(conf_items[i].param, 0);
- ret = pin_config_get_for_pin(pctldev, pin, &config);
+ config = pinconf_to_config_packed(items[i].param, 0);
+ if (gname)
+ ret = pin_config_group_get(dev_name(pctldev->dev),
+ gname, &config);
+ else
+ ret = pin_config_get_for_pin(pctldev, pin, &config);
/* These are legal errors */
if (ret == -EINVAL || ret == -ENOTSUPP)
continue;
@@ -85,56 +77,46 @@ void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
}
/* Space between multiple configs */
seq_puts(s, " ");
- seq_puts(s, conf_items[i].display);
+ seq_puts(s, items[i].display);
/* Print unit if available */
- if (conf_items[i].has_arg) {
+ if (items[i].has_arg) {
seq_printf(s, " (%u",
pinconf_to_config_argument(config));
- if (conf_items[i].format)
- seq_printf(s, " %s)", conf_items[i].format);
+ if (items[i].format)
+ seq_printf(s, " %s)", items[i].format);
else
seq_puts(s, ")");
}
}
}

-void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
- struct seq_file *s, const char *gname)
+/**
+ * pinconf_generic_dump_pins - Print information about pin or group of pins
+ * @pctldev: Pincontrol device
+ * @s: File to print to
+ * @gname: Group name specifying pins
+ * @pin: Pin number specyfying pin
+ *
+ * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
+ * specified either by pin using @pin or by group using @gname. Only one needs
+ * to be specified the other can be NULL/0.
+ */
+void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
+ const char *gname, unsigned pin)
{
const struct pinconf_ops *ops = pctldev->desc->confops;
- int i;

if (!ops->is_generic)
return;

- for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
- unsigned long config;
- int ret;
-
- /* We want to check out this parameter */
- config = pinconf_to_config_packed(conf_items[i].param, 0);
- ret = pin_config_group_get(dev_name(pctldev->dev), gname,
- &config);
- /* These are legal errors */
- if (ret == -EINVAL || ret == -ENOTSUPP)
- continue;
- if (ret) {
- seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
- continue;
- }
- /* Space between multiple configs */
- seq_puts(s, " ");
- seq_puts(s, conf_items[i].display);
- /* Print unit if available */
- if (conf_items[i].has_arg) {
- seq_printf(s, " (%u",
- pinconf_to_config_argument(config));
- if (conf_items[i].format)
- seq_printf(s, " %s)", conf_items[i].format);
- else
- seq_puts(s, ")");
- }
- }
+ /* generic parameters */
+ pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
+ ARRAY_SIZE(conf_items));
+ /* driver-specific parameters */
+ if (pctldev->desc->num_dt_params && pctldev->desc->conf_items)
+ pinconf_generic_dump_one(pctldev, s, gname, pin,
+ pctldev->desc->conf_items,
+ pctldev->desc->num_dt_params);
}

void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
@@ -148,17 +130,21 @@ void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
seq_printf(s, "%s: 0x%x", conf_items[i].display,
pinconf_to_config_argument(config));
}
+
+ if (!pctldev->desc->num_dt_params || !pctldev->desc->conf_items)
+ return;
+
+ for (i = 0; i < pctldev->desc->num_dt_params; i++) {
+ if (pinconf_to_config_param(config) != pctldev->desc->conf_items[i].param)
+ continue;
+ seq_printf(s, "%s: 0x%x", pctldev->desc->conf_items[i].display,
+ pinconf_to_config_argument(config));
+ }
}
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif

#ifdef CONFIG_OF
-struct pinconf_generic_dt_params {
- const char * const property;
- enum pin_config_param param;
- u32 default_value;
-};
-
static const struct pinconf_generic_dt_params dt_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
@@ -184,6 +170,47 @@ static const struct pinconf_generic_dt_params dt_params[] = {
};

/**
+ * parse_dt_cfg - Parse DT pinconf parameters
+ * @np: DT node
+ * @params: Array of describing DT 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
+ * 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_dt_params *params,
+ unsigned int count, unsigned long *cfg,
+ unsigned int *ncfg)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ u32 val;
+ int ret;
+ const struct pinconf_generic_dt_params *par = &params[i];
+
+ ret = of_property_read_u32(np, par->property, &val);
+
+ /* property not found */
+ if (ret == -EINVAL)
+ continue;
+
+ /* use default value, when no value is specified */
+ if (ret)
+ val = par->default_value;
+
+ pr_debug("found %s with value %u\n", par->property, val);
+ cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
+ (*ncfg)++;
+ }
+}
+
+/**
* pinconf_generic_parse_dt_config()
* parse the config properties into generic pinconfig values.
* @np: node containing the pinconfig properties
@@ -191,39 +218,29 @@ static const struct pinconf_generic_dt_params dt_params[] = {
* @nconfigs: umber of configurations
*/
int pinconf_generic_parse_dt_config(struct device_node *np,
+ struct pinctrl_dev *pctldev,
unsigned long **configs,
unsigned int *nconfigs)
{
unsigned long *cfg;
- unsigned int ncfg = 0;
+ unsigned int max_cfg, ncfg = 0;
int ret;
- int i;
- u32 val;

if (!np)
return -EINVAL;

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

- for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
- const struct pinconf_generic_dt_params *par = &dt_params[i];
- ret = of_property_read_u32(np, par->property, &val);
-
- /* property not found */
- if (ret == -EINVAL)
- continue;
-
- /* use default value, when no value is specified */
- if (ret)
- val = par->default_value;
-
- pr_debug("found %s with value %u\n", par->property, val);
- cfg[ncfg] = pinconf_to_config_packed(par->param, val);
- ncfg++;
- }
+ parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
+ if (pctldev && pctldev->desc->num_dt_params && pctldev->desc->params)
+ parse_dt_cfg(np, pctldev->desc->params,
+ pctldev->desc->num_dt_params, cfg, &ncfg);

ret = 0;

@@ -274,7 +291,8 @@ int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
function = NULL;
}

- ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
+ &num_configs);
if (ret < 0) {
dev_err(dev, "could not parse node property\n");
return ret;
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 8bfa0643e5dc..1fc09dc20199 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -288,7 +288,7 @@ static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
const struct pinconf_ops *ops = pctldev->desc->confops;

/* no-op when not using generic pin config */
- pinconf_generic_dump_pin(pctldev, s, pin);
+ pinconf_generic_dump_pins(pctldev, s, NULL, pin);
if (ops && ops->pin_config_dbg_show)
ops->pin_config_dbg_show(pctldev, s, pin);
}
@@ -333,7 +333,7 @@ static void pinconf_dump_group(struct pinctrl_dev *pctldev,
const struct pinconf_ops *ops = pctldev->desc->confops;

/* no-op when not using generic pin config */
- pinconf_generic_dump_group(pctldev, s, gname);
+ pinconf_generic_dump_pins(pctldev, s, gname, 0);
if (ops && ops->pin_config_group_dbg_show)
ops->pin_config_group_dbg_show(pctldev, s, selector);
}
diff --git a/drivers/pinctrl/pinconf.h b/drivers/pinctrl/pinconf.h
index a4a5417e1413..55c75780b3b2 100644
--- a/drivers/pinctrl/pinconf.h
+++ b/drivers/pinctrl/pinconf.h
@@ -92,26 +92,17 @@ static inline void pinconf_init_device_debugfs(struct dentry *devroot,

#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_DEBUG_FS)

-void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
- struct seq_file *s, unsigned pin);
-
-void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
- struct seq_file *s, const char *gname);
+void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev,
+ struct seq_file *s, const char *gname,
+ unsigned pin);

void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned long config);
#else

-static inline void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
- struct seq_file *s,
- unsigned pin)
-{
- return;
-}
-
-static inline void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
- struct seq_file *s,
- const char *gname)
+static inline void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ const char *gname, unsigned pin)
{
return;
}
@@ -126,6 +117,7 @@ static inline void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,

#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_OF)
int pinconf_generic_parse_dt_config(struct device_node *np,
+ struct pinctrl_dev *pctldev,
unsigned long **configs,
unsigned int *nconfigs);
#endif
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 40970c305dd0..a72fe6faa392 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1140,7 +1140,7 @@ static int rockchip_pinctrl_parse_groups(struct device_node *np,
return -EINVAL;

np_config = of_find_node_by_phandle(be32_to_cpup(phandle));
- ret = pinconf_generic_parse_dt_config(np_config,
+ ret = pinconf_generic_parse_dt_config(np_config, NULL,
&grp->data[j].configs, &grp->data[j].nconfigs);
if (ret)
return ret;
diff --git a/drivers/pinctrl/pinctrl-tz1090-pdc.c b/drivers/pinctrl/pinctrl-tz1090-pdc.c
index 3bb6a3b78864..0e3576ba1a7c 100644
--- a/drivers/pinctrl/pinctrl-tz1090-pdc.c
+++ b/drivers/pinctrl/pinctrl-tz1090-pdc.c
@@ -415,7 +415,7 @@ static int tz1090_pdc_pinctrl_dt_subnode_to_map(struct device *dev,
function = NULL;
}

- ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
if (ret)
return ret;

diff --git a/drivers/pinctrl/pinctrl-tz1090.c b/drivers/pinctrl/pinctrl-tz1090.c
index 48d36413b99f..0b36566db451 100644
--- a/drivers/pinctrl/pinctrl-tz1090.c
+++ b/drivers/pinctrl/pinctrl-tz1090.c
@@ -1131,7 +1131,7 @@ static int tz1090_pinctrl_dt_subnode_to_map(struct device *dev,
function = NULL;
}

- ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
if (ret)
return ret;

diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index 910deaefa0ac..072e7c62cab7 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -122,7 +122,7 @@ static int sh_pfc_dt_subnode_to_map(struct device *dev, struct device_node *np,
return ret;
}

- ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
if (ret < 0)
return ret;

diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index b6dedfbfce69..5731703b27c2 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -115,6 +115,18 @@ enum pin_config_param {
PIN_CONFIG_END = 0x7FFF,
};

+#ifdef CONFIG_DEBUG_FS
+#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
+ .has_arg = d }
+
+struct pin_config_item {
+ const enum pin_config_param param;
+ const char * const display;
+ const char * const format;
+ bool has_arg;
+};
+#endif /* CONFIG_DEBUG_FS */
+
/*
* Helpful configuration macro to be used in tables etc.
*/
@@ -150,6 +162,12 @@ static inline unsigned long pinconf_to_config_packed(enum pin_config_param param
struct pinctrl_dev;
struct pinctrl_map;

+struct pinconf_generic_dt_params {
+ const char * const property;
+ enum pin_config_param param;
+ 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,
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index cc8e1aff0e28..c58b3e11ba8e 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -24,6 +24,7 @@ struct pinctrl_dev;
struct pinctrl_map;
struct pinmux_ops;
struct pinconf_ops;
+struct pin_config_item;
struct gpio_chip;
struct device_node;

@@ -117,6 +118,9 @@ struct pinctrl_ops {
* @confops: pin config operations vtable, if you support pin configuration in
* your driver
* @owner: module providing the pin controller, used for refcounting
+ * @num_dt_params: Number of driver-specific DT parameters
+ * @params: List of DT parameters
+ * @conf_items: Information how to print @params in debugfs
*/
struct pinctrl_desc {
const char *name;
@@ -126,6 +130,11 @@ struct pinctrl_desc {
const struct pinmux_ops *pmxops;
const struct pinconf_ops *confops;
struct module *owner;
+#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_OF)
+ unsigned int num_dt_params;
+ const struct pinconf_generic_dt_params *params;
+ const struct pin_config_item *conf_items;
+#endif
};

/* External interface to pin controller */
--
2.1.3.1.ge241007

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