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6a350ccc4d
Akin to my recently added pinctrl_generic_pins_functions_dt_node_to_map(), create an analogue that performs the same role of dynamically creating groups at runtime for controllers using the pinmux property. The pinmux property is freeform, so this function mandates that the upper 16 bits contain the pin and the lower 16 bits contains the mux setting. The group's data pointer is populated with an array of the mux settings for each pin it contains. Since the node parsing and subsequent pinctrl core function calls are practically identical to the pins + functions case, other than which properties are examined, it makes sense to extract the common code from pinctrl_generic_pins_function_dt_node_to_map() into a generic function that takes the case-specific devicetree parsing function as an argument. Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Linus Walleij <linusw@kernel.org>
283 lines
7.9 KiB
C
283 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "generic pinconfig core: " fmt
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#include <linux/array_size.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinctrl.h>
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#include "core.h"
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#include "pinconf.h"
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#include "pinctrl-utils.h"
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#include "pinmux.h"
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int pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *parent,
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struct device_node *np, struct pinctrl_map **maps,
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unsigned int *num_maps, unsigned int *num_reserved_maps,
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const char **group_names, unsigned int ngroups,
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void *data, unsigned int *pins, unsigned int npins)
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{
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struct device *dev = pctldev->dev;
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unsigned int num_configs;
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const char *group_name;
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unsigned long *configs;
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int ret, reserve = 1;
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group_name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", parent, np);
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if (!group_name)
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return -ENOMEM;
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group_names[ngroups] = group_name;
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ret = pinctrl_utils_reserve_map(pctldev, maps, num_reserved_maps, num_maps, reserve);
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if (ret)
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return ret;
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ret = pinctrl_utils_add_map_mux(pctldev, maps, num_reserved_maps, num_maps, group_name,
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parent->name);
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if (ret < 0)
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return ret;
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ret = pinctrl_generic_add_group(pctldev, group_name, pins, npins, data);
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if (ret < 0)
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return dev_err_probe(dev, ret, "failed to add group %s: %d\n",
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group_name, ret);
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ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &num_configs);
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if (ret)
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return dev_err_probe(dev, ret, "failed to parse pin config of group %s\n",
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group_name);
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if (num_configs == 0)
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return 0;
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ret = pinctrl_utils_reserve_map(pctldev, maps, num_reserved_maps, num_maps, reserve);
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if (ret)
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return ret;
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ret = pinctrl_utils_add_map_configs(pctldev, maps, num_reserved_maps, num_maps, group_name,
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configs,
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num_configs, PIN_MAP_TYPE_CONFIGS_GROUP);
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kfree(configs);
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if (ret)
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return ret;
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return 0;
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};
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EXPORT_SYMBOL_GPL(pinctrl_generic_to_map);
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static int pinctrl_generic_pins_function_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *parent,
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struct device_node *np,
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struct pinctrl_map **maps,
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unsigned int *num_maps,
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unsigned int *num_reserved_maps,
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const char **group_names,
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unsigned int ngroups)
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{
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struct device *dev = pctldev->dev;
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unsigned int pin, *pins;
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const char **functions;
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int npins, ret;
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npins = of_property_count_u32_elems(np, "pins");
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if (npins < 1) {
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dev_err(dev, "invalid pinctrl group %pOFn.%pOFn %d\n",
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parent, np, npins);
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return npins;
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}
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pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
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if (!pins)
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return -ENOMEM;
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functions = devm_kcalloc(dev, npins, sizeof(*functions), GFP_KERNEL);
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if (!functions)
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return -ENOMEM;
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for (int i = 0; i < npins; i++) {
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ret = of_property_read_u32_index(np, "pins", i, &pin);
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if (ret)
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return ret;
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pins[i] = pin;
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ret = of_property_read_string(np, "function", &functions[i]);
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if (ret)
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return ret;
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}
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return pinctrl_generic_to_map(pctldev, parent, np, maps, num_maps,
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num_reserved_maps, group_names, ngroups,
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functions, pins, npins);
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}
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static int pinctrl_generic_pinmux_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *parent,
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struct device_node *np,
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struct pinctrl_map **maps,
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unsigned int *num_maps,
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unsigned int *num_reserved_maps,
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const char **group_names,
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unsigned int ngroups)
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{
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struct device *dev = pctldev->dev;
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unsigned int *pins, *muxes;
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int npins, ret;
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npins = of_property_count_u32_elems(np, "pinmux");
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if (npins < 1) {
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dev_err(dev, "invalid pinctrl group %pOFn.%pOFn %d\n",
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parent, np, npins);
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return npins;
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}
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pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
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if (!pins)
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return -ENOMEM;
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muxes = devm_kcalloc(dev, npins, sizeof(*muxes), GFP_KERNEL);
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if (!muxes)
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return -ENOMEM;
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for (int i = 0; i < npins; i++) {
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unsigned int pinmux;
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ret = of_property_read_u32_index(np, "pinmux", i, &pinmux);
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if (ret)
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return ret;
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pins[i] = pinmux >> 16;
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muxes[i] = pinmux & GENMASK(15, 0);
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}
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return pinctrl_generic_to_map(pctldev, parent, np, maps, num_maps,
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num_reserved_maps, group_names, ngroups,
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muxes, pins, npins);
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}
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static int pinctrl_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np,
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struct pinctrl_map **maps,
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unsigned int *num_maps,
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int (dt_subnode_to_map)(
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struct pinctrl_dev *,
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struct device_node *,
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struct device_node *,
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struct pinctrl_map **,
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unsigned int *,
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unsigned int *,
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const char **,
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unsigned int))
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{
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struct device *dev = pctldev->dev;
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struct device_node *child_np;
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const char **group_names;
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unsigned int num_reserved_maps = 0;
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int ngroups = 0;
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int ret;
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*maps = NULL;
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*num_maps = 0;
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/*
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* Check if this is actually the pins node, or a parent containing
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* multiple pins nodes.
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*/
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if (!of_property_present(np, "pins"))
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goto parent;
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group_names = devm_kcalloc(dev, 1, sizeof(*group_names), GFP_KERNEL);
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if (!group_names)
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return -ENOMEM;
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ret = dt_subnode_to_map(pctldev, np, np, maps, num_maps,
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&num_reserved_maps, group_names, ngroups);
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if (ret) {
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pinctrl_utils_free_map(pctldev, *maps, *num_maps);
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return dev_err_probe(dev, ret, "error figuring out mappings for %s\n", np->name);
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}
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ret = pinmux_generic_add_function(pctldev, np->name, group_names, 1, NULL);
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if (ret < 0) {
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pinctrl_utils_free_map(pctldev, *maps, *num_maps);
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return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
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}
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return 0;
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parent:
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for_each_available_child_of_node(np, child_np)
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ngroups += 1;
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group_names = devm_kcalloc(dev, ngroups, sizeof(*group_names), GFP_KERNEL);
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if (!group_names)
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return -ENOMEM;
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ngroups = 0;
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for_each_available_child_of_node_scoped(np, child_np) {
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ret = dt_subnode_to_map(pctldev, np, child_np, maps, num_maps,
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&num_reserved_maps, group_names, ngroups);
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if (ret) {
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pinctrl_utils_free_map(pctldev, *maps, *num_maps);
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return dev_err_probe(dev, ret, "error figuring out mappings for %s\n",
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np->name);
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}
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ngroups++;
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}
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ret = pinmux_generic_add_function(pctldev, np->name, group_names, ngroups, NULL);
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if (ret < 0) {
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pinctrl_utils_free_map(pctldev, *maps, *num_maps);
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return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
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}
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return 0;
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}
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/*
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* For platforms that do not define groups or functions in the driver, but
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* instead use the devicetree to describe them. This function will, unlike
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* pinconf_generic_dt_node_to_map() etc which rely on driver defined groups
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* and functions, create them in addition to parsing pinconf properties and
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* adding mappings.
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*/
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int pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np,
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struct pinctrl_map **maps,
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unsigned int *num_maps)
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{
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return pinctrl_generic_dt_node_to_map(pctldev, np, maps, num_maps,
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&pinctrl_generic_pins_function_dt_subnode_to_map);
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}
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EXPORT_SYMBOL_GPL(pinctrl_generic_pins_function_dt_node_to_map);
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/*
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* For platforms that do not define groups or functions in the driver, but
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* instead use the devicetree to describe them. This function will, unlike
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* pinconf_generic_dt_node_to_map() etc which rely on driver defined groups
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* and functions, create them in addition to parsing pinconf properties and
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* adding mappings.
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*
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* It assumes that the upper 16 bits of the pinmux items contain the pin
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* and the lower 16 the mux setting.
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*/
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int pinctrl_generic_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np,
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struct pinctrl_map **maps,
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unsigned int *num_maps)
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{
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return pinctrl_generic_dt_node_to_map(pctldev, np, maps, num_maps,
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&pinctrl_generic_pinmux_dt_subnode_to_map);
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};
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EXPORT_SYMBOL_GPL(pinctrl_generic_pinmux_dt_node_to_map);
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