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authorLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 10:42:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 10:42:20 -0700
commit5bd4af34a09a381a0f8b1552684650698937e6b0 (patch)
treef539764b25c09e6e1d181854e281c14c162fc30c /drivers/of/base.c
parent738b04fba18d35cd352b7b15afefb8a7b798648e (diff)
parent59eaeba63a171127a90bb76187536ba66076af40 (diff)
Merge tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial updates from Greg KH: "Here is the big tty and serial pull request for 4.20-rc1 Lots of little things here, including a merge from the SPI tree in order to keep things simpler for everyone to sync around for one platform. Major stuff is: - tty buffer clearing after use - atmel_serial fixes and additions - xilinx uart driver updates and of course, lots of tiny fixes and additions to individual serial drivers. All of these have been in linux-next with no reported issues for a while" * tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (66 commits) of: base: Change logic in of_alias_get_alias_list() of: base: Fix english spelling in of_alias_get_alias_list() serial: sh-sci: do not warn if DMA transfers are not supported serial: uartps: Do not allow use aliases >= MAX_UART_INSTANCES tty: check name length in tty_find_polling_driver() serial: sh-sci: Add r8a77990 support tty: wipe buffer if not echoing data tty: wipe buffer. serial: fsl_lpuart: Remove the alias node dependence TTY: sn_console: Replace spin_is_locked() with spin_trylock() Revert "serial:serial_core: Allow use of CTS for PPS line discipline" serial: 8250_uniphier: add auto-flow-control support serial: 8250_uniphier: flatten probe function serial: 8250_uniphier: remove unused "fifo-size" property dt-bindings: serial: sh-sci: Document r8a7744 bindings serial: uartps: Fix missing unlock on error in cdns_get_id() tty/serial: atmel: add ISO7816 support tty/serial_core: add ISO7816 infrastructure serial:serial_core: Allow use of CTS for PPS line discipline serial: docs: Fix filename for serial reference implementation ...
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r--drivers/of/base.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 13ebb16be64e..d023cf303d56 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -16,6 +16,7 @@
#define pr_fmt(fmt) "OF: " fmt
+#include <linux/bitmap.h>
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/cpu.h>
@@ -1986,6 +1987,59 @@ int of_alias_get_id(struct device_node *np, const char *stem)
EXPORT_SYMBOL_GPL(of_alias_get_id);
/**
+ * of_alias_get_alias_list - Get alias list for the given device driver
+ * @matches: Array of OF device match structures to search in
+ * @stem: Alias stem of the given device_node
+ * @bitmap: Bitmap field pointer
+ * @nbits: Maximum number of alias IDs which can be recorded in bitmap
+ *
+ * The function travels the lookup table to record alias ids for the given
+ * device match structures and alias stem.
+ *
+ * Return: 0 or -ENOSYS when !CONFIG_OF or
+ * -EOVERFLOW if alias ID is greater then allocated nbits
+ */
+int of_alias_get_alias_list(const struct of_device_id *matches,
+ const char *stem, unsigned long *bitmap,
+ unsigned int nbits)
+{
+ struct alias_prop *app;
+ int ret = 0;
+
+ /* Zero bitmap field to make sure that all the time it is clean */
+ bitmap_zero(bitmap, nbits);
+
+ mutex_lock(&of_mutex);
+ pr_debug("%s: Looking for stem: %s\n", __func__, stem);
+ list_for_each_entry(app, &aliases_lookup, link) {
+ pr_debug("%s: stem: %s, id: %d\n",
+ __func__, app->stem, app->id);
+
+ if (strcmp(app->stem, stem) != 0) {
+ pr_debug("%s: stem comparison didn't pass %s\n",
+ __func__, app->stem);
+ continue;
+ }
+
+ if (of_match_node(matches, app->np)) {
+ pr_debug("%s: Allocated ID %d\n", __func__, app->id);
+
+ if (app->id >= nbits) {
+ pr_warn("%s: ID %d >= than bitmap field %d\n",
+ __func__, app->id, nbits);
+ ret = -EOVERFLOW;
+ } else {
+ set_bit(app->id, bitmap);
+ }
+ }
+ }
+ mutex_unlock(&of_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_alias_list);
+
+/**
* of_alias_get_highest_id - Get highest alias id for the given stem
* @stem: Alias stem to be examined
*