diff options
| author | Herve Codina (Schneider Electric) <herve.codina@bootlin.com> | 2026-01-14 10:39:30 +0100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2026-01-15 12:03:27 +0100 |
| commit | 49d2cda7ca2e8e287617e7a5b7fae523eaece955 (patch) | |
| tree | d922e05e9f12afd350d84b5f943ff64436880f05 /include | |
| parent | 1bea7e94bf09ee6d46051076866a9369f64d302a (diff) | |
of/irq: Introduce for_each_of_imap_item
for_each_of_imap_item is an iterator designed to help a driver to parse
an interrupt-map property.
Indeed some drivers need to know details about the interrupt mapping
described in the device-tree in order to set internal registers
accordingly.
Signed-off-by: Herve Codina (Schneider Electric) <herve.codina@bootlin.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/20260114093938.1089936-2-herve.codina@bootlin.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/of_irq.h | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h index 1c2bc0281807..2a64d8cecaae 100644 --- a/include/linux/of_irq.h +++ b/include/linux/of_irq.h @@ -11,6 +11,30 @@ typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *); +struct of_imap_parser { + struct device_node *node; + const __be32 *imap; + const __be32 *imap_end; + u32 parent_offset; +}; + +struct of_imap_item { + struct of_phandle_args parent_args; + u32 child_imap_count; + u32 child_imap[16]; /* Arbitrary size. + * Should be #address-cells + #interrupt-cells but + * avoid using allocation and so, expect that 16 + * should be enough + */ +}; + +/* + * If the iterator is exited prematurely (break, goto, return) of_node_put() has + * to be called on item.parent_args.np + */ +#define for_each_of_imap_item(parser, item) \ + for (; of_imap_parser_one(parser, item);) + /* * Workarounds only applied to 32bit powermac machines */ @@ -49,6 +73,11 @@ extern int of_irq_get_byname(struct device_node *dev, const char *name); extern int of_irq_to_resource_table(struct device_node *dev, struct resource *res, int nr_irqs); extern struct device_node *of_irq_find_parent(struct device_node *child); +extern int of_imap_parser_init(struct of_imap_parser *parser, + struct device_node *node, + struct of_imap_item *item); +extern struct of_imap_item *of_imap_parser_one(struct of_imap_parser *parser, + struct of_imap_item *item); extern struct irq_domain *of_msi_get_domain(struct device *dev, const struct device_node *np, enum irq_domain_bus_token token); @@ -92,7 +121,17 @@ static inline void *of_irq_find_parent(struct device_node *child) { return NULL; } - +static inline int of_imap_parser_init(struct of_imap_parser *parser, + struct device_node *node, + struct of_imap_item *item) +{ + return -ENOSYS; +} +static inline struct of_imap_item *of_imap_parser_one(struct of_imap_parser *parser, + struct of_imap_item *item) +{ + return NULL; +} static inline struct irq_domain *of_msi_get_domain(struct device *dev, struct device_node *np, enum irq_domain_bus_token token) |