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![Simon Glass](/assets/img/avatar_default.png)
At present of-platdata does not provide parent information. But this is useful for I2C devices, for example, since it allows them to determine which bus they are on. Add support for setting the parent correctly, by storing the parent driver_info index in dtoc and reading this in lists_bind_drivers(). This needs multiple passes since we must process children after their parents already have been bound. Signed-off-by: Simon Glass <sjg@chromium.org>
269 lines
6.5 KiB
C
269 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013 Google, Inc
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*
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* (C) Copyright 2012
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* Marek Vasut <marex@denx.de>
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*/
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#define LOG_CATEGORY LOGC_DM
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#include <common.h>
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#include <errno.h>
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#include <log.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/platdata.h>
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#include <dm/uclass.h>
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#include <dm/util.h>
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#include <fdtdec.h>
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#include <linux/compiler.h>
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struct driver *lists_driver_lookup_name(const char *name)
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{
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struct driver *drv =
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ll_entry_start(struct driver, driver);
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const int n_ents = ll_entry_count(struct driver, driver);
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struct driver *entry;
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (!strcmp(name, entry->name))
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return entry;
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}
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/* Not found */
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return NULL;
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}
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struct uclass_driver *lists_uclass_lookup(enum uclass_id id)
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{
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struct uclass_driver *uclass =
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ll_entry_start(struct uclass_driver, uclass);
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const int n_ents = ll_entry_count(struct uclass_driver, uclass);
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struct uclass_driver *entry;
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for (entry = uclass; entry != uclass + n_ents; entry++) {
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if (entry->id == id)
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return entry;
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}
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return NULL;
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}
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static int bind_drivers_pass(struct udevice *parent, bool pre_reloc_only)
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{
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struct driver_info *info =
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ll_entry_start(struct driver_info, driver_info);
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const int n_ents = ll_entry_count(struct driver_info, driver_info);
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bool missing_parent = false;
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int result = 0;
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uint idx;
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/*
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* Do one iteration through the driver_info records. For of-platdata,
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* bind only devices whose parent is already bound. If we find any
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* device we can't bind, set missing_parent to true, which will cause
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* this function to be called again.
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*/
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for (idx = 0; idx < n_ents; idx++) {
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struct udevice *par = parent;
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const struct driver_info *entry = info + idx;
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struct driver_rt *drt = gd_dm_driver_rt() + idx;
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struct udevice *dev;
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int ret;
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if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
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int parent_idx = driver_info_parent_id(entry);
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if (drt->dev)
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continue;
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if (CONFIG_IS_ENABLED(OF_PLATDATA_PARENT) &&
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parent_idx != -1) {
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struct driver_rt *parent_drt;
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parent_drt = gd_dm_driver_rt() + parent_idx;
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if (!parent_drt->dev) {
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missing_parent = true;
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continue;
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}
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par = parent_drt->dev;
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}
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}
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ret = device_bind_by_name(par, pre_reloc_only, entry, &dev);
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if (!ret) {
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if (CONFIG_IS_ENABLED(OF_PLATDATA))
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drt->dev = dev;
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} else if (ret != -EPERM) {
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dm_warn("No match for driver '%s'\n", entry->name);
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if (!result || ret != -ENOENT)
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result = ret;
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}
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}
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return result ? result : missing_parent ? -EAGAIN : 0;
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}
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int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
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{
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int result = 0;
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int pass;
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/*
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* 10 passes is 10 levels deep in the devicetree, which is plenty. If
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* OF_PLATDATA_PARENT is not enabled, then bind_drivers_pass() will
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* always succeed on the first pass.
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*/
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for (pass = 0; pass < 10; pass++) {
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int ret;
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ret = bind_drivers_pass(parent, pre_reloc_only);
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if (!ret)
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break;
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if (ret != -EAGAIN && !result)
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result = ret;
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}
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return result;
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}
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int device_bind_driver(struct udevice *parent, const char *drv_name,
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const char *dev_name, struct udevice **devp)
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{
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return device_bind_driver_to_node(parent, drv_name, dev_name,
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ofnode_null(), devp);
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}
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int device_bind_driver_to_node(struct udevice *parent, const char *drv_name,
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const char *dev_name, ofnode node,
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struct udevice **devp)
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{
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struct driver *drv;
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int ret;
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drv = lists_driver_lookup_name(drv_name);
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if (!drv) {
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debug("Cannot find driver '%s'\n", drv_name);
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return -ENOENT;
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}
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ret = device_bind_with_driver_data(parent, drv, dev_name, 0 /* data */,
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node, devp);
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return ret;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
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/**
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* driver_check_compatible() - Check if a driver matches a compatible string
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*
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* @param of_match: List of compatible strings to match
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* @param of_idp: Returns the match that was found
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* @param compat: The compatible string to search for
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* @return 0 if there is a match, -ENOENT if no match
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*/
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static int driver_check_compatible(const struct udevice_id *of_match,
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const struct udevice_id **of_idp,
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const char *compat)
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{
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if (!of_match)
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return -ENOENT;
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while (of_match->compatible) {
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if (!strcmp(of_match->compatible, compat)) {
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*of_idp = of_match;
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return 0;
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}
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of_match++;
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}
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return -ENOENT;
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}
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int lists_bind_fdt(struct udevice *parent, ofnode node, struct udevice **devp,
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bool pre_reloc_only)
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{
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struct driver *driver = ll_entry_start(struct driver, driver);
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const int n_ents = ll_entry_count(struct driver, driver);
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const struct udevice_id *id;
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struct driver *entry;
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struct udevice *dev;
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bool found = false;
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const char *name, *compat_list, *compat;
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int compat_length, i;
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int result = 0;
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int ret = 0;
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if (devp)
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*devp = NULL;
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name = ofnode_get_name(node);
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log_debug("bind node %s\n", name);
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compat_list = ofnode_get_property(node, "compatible", &compat_length);
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if (!compat_list) {
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if (compat_length == -FDT_ERR_NOTFOUND) {
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log_debug("Device '%s' has no compatible string\n",
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name);
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return 0;
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}
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dm_warn("Device tree error at node '%s'\n", name);
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return compat_length;
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}
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/*
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* Walk through the compatible string list, attempting to match each
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* compatible string in order such that we match in order of priority
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* from the first string to the last.
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*/
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for (i = 0; i < compat_length; i += strlen(compat) + 1) {
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compat = compat_list + i;
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log_debug(" - attempt to match compatible string '%s'\n",
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compat);
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for (entry = driver; entry != driver + n_ents; entry++) {
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ret = driver_check_compatible(entry->of_match, &id,
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compat);
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if (!ret)
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break;
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}
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if (entry == driver + n_ents)
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continue;
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if (pre_reloc_only) {
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if (!ofnode_pre_reloc(node) &&
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!(entry->flags & DM_FLAG_PRE_RELOC)) {
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log_debug("Skipping device pre-relocation\n");
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return 0;
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}
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}
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log_debug(" - found match at '%s': '%s' matches '%s'\n",
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entry->name, entry->of_match->compatible,
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id->compatible);
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ret = device_bind_with_driver_data(parent, entry, name,
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id->data, node, &dev);
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if (ret == -ENODEV) {
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log_debug("Driver '%s' refuses to bind\n", entry->name);
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continue;
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}
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if (ret) {
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dm_warn("Error binding driver '%s': %d\n", entry->name,
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ret);
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return ret;
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} else {
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found = true;
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if (devp)
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*devp = dev;
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}
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break;
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}
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if (!found && !result && ret != -ENODEV)
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log_debug("No match for node '%s'\n", name);
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return result;
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}
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#endif
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