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path: root/drivers/pinctrl/pinconf-generic.c
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Diffstat (limited to 'drivers/pinctrl/pinconf-generic.c')
-rw-r--r--drivers/pinctrl/pinconf-generic.c104
1 files changed, 103 insertions, 1 deletions
diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index 2ad5a8d337b5..8594f033ac21 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/of.h>
#include "core.h"
#include "pinconf.h"
@@ -37,14 +38,18 @@ struct pin_config_item {
static struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
+ PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
+ PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
+ "input bias pull to pin specific state", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
+ PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
- PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
+ PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"),
PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
@@ -135,3 +140,100 @@ void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
}
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 struct pinconf_generic_dt_params dt_params[] = {
+ { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
+ { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
+ { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
+ { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
+ { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
+ { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
+ { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
+ { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
+ { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
+ { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
+ { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
+ { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
+ { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
+ { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
+ { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
+ { "output-low", PIN_CONFIG_OUTPUT, 0, },
+ { "output-high", PIN_CONFIG_OUTPUT, 1, },
+};
+
+/**
+ * pinconf_generic_parse_dt_config()
+ * parse the config properties into generic pinconfig values.
+ * @np: node containing the pinconfig properties
+ * @configs: array with nconfigs entries containing the generic pinconf values
+ * @nconfigs: umber of configurations
+ */
+int pinconf_generic_parse_dt_config(struct device_node *np,
+ unsigned long **configs,
+ unsigned int *nconfigs)
+{
+ unsigned long *cfg;
+ unsigned int 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);
+ if (!cfg)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+ 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++;
+ }
+
+ ret = 0;
+
+ /* no configs found at all */
+ if (ncfg == 0) {
+ *configs = NULL;
+ *nconfigs = 0;
+ goto out;
+ }
+
+ /*
+ * Now limit the number of configs to the real number of
+ * found properties.
+ */
+ *configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
+ if (!*configs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
+ *nconfigs = ncfg;
+
+out:
+ kfree(cfg);
+ return ret;
+}
+#endif