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authorStephen Boyd <sboyd@kernel.org>2018-04-06 22:38:08 +0200
committerStephen Boyd <sboyd@kernel.org>2018-04-06 22:38:08 +0200
commitb44c4ddf4a15c42a91a88aaa32b7d53cf43391cb (patch)
tree04dbcb069c73c3c1fd82d177c50f44fac75beff1 /drivers
parentMerge branches 'clk-stratix10', 'clk-imx', 'clk-bcm', 'clk-cs2000' and 'clk-i... (diff)
parentclk: davinci: add a reset lookup table for psc0 (diff)
downloadlinux-b44c4ddf4a15c42a91a88aaa32b7d53cf43391cb.tar.xz
linux-b44c4ddf4a15c42a91a88aaa32b7d53cf43391cb.zip
Merge branch 'clk-davinci' into clk-next
* clk-davinci: clk: davinci: add a reset lookup table for psc0 reset: modify the way reset lookup works for board files reset: add support for non-DT systems
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/davinci/psc-da850.c7
-rw-r--r--drivers/clk/davinci/psc.c1
-rw-r--r--drivers/reset/core.c96
3 files changed, 103 insertions, 1 deletions
diff --git a/drivers/clk/davinci/psc-da850.c b/drivers/clk/davinci/psc-da850.c
index ccc7eb17bf3a..d196dcbed560 100644
--- a/drivers/clk/davinci/psc-da850.c
+++ b/drivers/clk/davinci/psc-da850.c
@@ -6,6 +6,7 @@
*/
#include <linux/clk-provider.h>
+#include <linux/reset-controller.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
@@ -66,8 +67,14 @@ LPSC_CLKDEV3(ecap_clkdev, "fck", "ecap.0",
"fck", "ecap.1",
"fck", "ecap.2");
+static struct reset_control_lookup da850_psc0_reset_lookup_table[] = {
+ RESET_LOOKUP("da850-psc0", 15, "davinci-rproc.0", NULL),
+};
+
static int da850_psc0_init(struct device *dev, void __iomem *base)
{
+ reset_controller_add_lookup(da850_psc0_reset_lookup_table,
+ ARRAY_SIZE(da850_psc0_reset_lookup_table));
return davinci_psc_register_clocks(dev, da850_psc0_info, 16, base);
}
diff --git a/drivers/clk/davinci/psc.c b/drivers/clk/davinci/psc.c
index ff6f4a038e04..ce170e600f09 100644
--- a/drivers/clk/davinci/psc.c
+++ b/drivers/clk/davinci/psc.c
@@ -425,6 +425,7 @@ __davinci_psc_register_clocks(struct device *dev,
psc->rcdev.ops = &davinci_psc_reset_ops;
psc->rcdev.owner = THIS_MODULE;
+ psc->rcdev.dev = dev;
psc->rcdev.of_node = dev->of_node;
psc->rcdev.of_reset_n_cells = 1;
psc->rcdev.of_xlate = davinci_psc_reset_of_xlate;
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index da4292e9de97..6488292e129c 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -23,6 +23,9 @@
static DEFINE_MUTEX(reset_list_mutex);
static LIST_HEAD(reset_controller_list);
+static DEFINE_MUTEX(reset_lookup_mutex);
+static LIST_HEAD(reset_lookup_list);
+
/**
* struct reset_control - a reset control
* @rcdev: a pointer to the reset controller device
@@ -148,6 +151,33 @@ int devm_reset_controller_register(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_reset_controller_register);
+/**
+ * reset_controller_add_lookup - register a set of lookup entries
+ * @lookup: array of reset lookup entries
+ * @num_entries: number of entries in the lookup array
+ */
+void reset_controller_add_lookup(struct reset_control_lookup *lookup,
+ unsigned int num_entries)
+{
+ struct reset_control_lookup *entry;
+ unsigned int i;
+
+ mutex_lock(&reset_lookup_mutex);
+ for (i = 0; i < num_entries; i++) {
+ entry = &lookup[i];
+
+ if (!entry->dev_id || !entry->provider) {
+ pr_warn("%s(): reset lookup entry badly specified, skipping\n",
+ __func__);
+ continue;
+ }
+
+ list_add_tail(&entry->list, &reset_lookup_list);
+ }
+ mutex_unlock(&reset_lookup_mutex);
+}
+EXPORT_SYMBOL_GPL(reset_controller_add_lookup);
+
static inline struct reset_control_array *
rstc_to_array(struct reset_control *rstc) {
return container_of(rstc, struct reset_control_array, base);
@@ -493,6 +523,70 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
}
EXPORT_SYMBOL_GPL(__of_reset_control_get);
+static struct reset_controller_dev *
+__reset_controller_by_name(const char *name)
+{
+ struct reset_controller_dev *rcdev;
+
+ lockdep_assert_held(&reset_list_mutex);
+
+ list_for_each_entry(rcdev, &reset_controller_list, list) {
+ if (!rcdev->dev)
+ continue;
+
+ if (!strcmp(name, dev_name(rcdev->dev)))
+ return rcdev;
+ }
+
+ return NULL;
+}
+
+static struct reset_control *
+__reset_control_get_from_lookup(struct device *dev, const char *con_id,
+ bool shared, bool optional)
+{
+ const struct reset_control_lookup *lookup;
+ struct reset_controller_dev *rcdev;
+ const char *dev_id = dev_name(dev);
+ struct reset_control *rstc = NULL;
+
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
+ mutex_lock(&reset_lookup_mutex);
+
+ list_for_each_entry(lookup, &reset_lookup_list, list) {
+ if (strcmp(lookup->dev_id, dev_id))
+ continue;
+
+ if ((!con_id && !lookup->con_id) ||
+ ((con_id && lookup->con_id) &&
+ !strcmp(con_id, lookup->con_id))) {
+ mutex_lock(&reset_list_mutex);
+ rcdev = __reset_controller_by_name(lookup->provider);
+ if (!rcdev) {
+ mutex_unlock(&reset_list_mutex);
+ mutex_unlock(&reset_lookup_mutex);
+ /* Reset provider may not be ready yet. */
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ rstc = __reset_control_get_internal(rcdev,
+ lookup->index,
+ shared);
+ mutex_unlock(&reset_list_mutex);
+ break;
+ }
+ }
+
+ mutex_unlock(&reset_lookup_mutex);
+
+ if (!rstc)
+ return optional ? NULL : ERR_PTR(-ENOENT);
+
+ return rstc;
+}
+
struct reset_control *__reset_control_get(struct device *dev, const char *id,
int index, bool shared, bool optional)
{
@@ -500,7 +594,7 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
return __of_reset_control_get(dev->of_node, id, index, shared,
optional);
- return optional ? NULL : ERR_PTR(-EINVAL);
+ return __reset_control_get_from_lookup(dev, id, shared, optional);
}
EXPORT_SYMBOL_GPL(__reset_control_get);