Hi Rafal,
On Tue, May 23, 2017 at 07:30:21AM +0200, Rafał Miłecki wrote:
> From: Brian Norris <computersforpeace@xxxxxxxxx>
>
> Partition parsers can now provide an of_match_table to enable
> flash<-->parser matching via device tree.
>
> This support is currently limited to built-in parsers as it uses
> request_module() and friends. This should be sufficient for most cases
> though as compiling parsers as modules isn't a common choice.
>
> Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> Acked-by: Brian Norris <computersforpeac@xxxxxxxxx>
I've pushed patches 1 and 2 to l2-mtd.git. I'm still looking at one
piece below:
> ---
> This is based on Brian's patches:
> [RFC PATCH 4/7] mtd: add of_match_mtd_parser() and of_mtd_match_mtd_parser() helpers
> [RFC PATCH 6/7] RFC: mtd: partitions: enable of_match_table matching
>
> V1: Put helpers in mtdpart.c instead of drivers/of/of_mtd.c
> Merge helpers into a single of_mtd_match_mtd_parser
> V3: Add a simple comment to note we will need the best match in the future
> ---
> drivers/mtd/mtdpart.c | 48 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mtd/partitions.h | 1 +
> 2 files changed, 49 insertions(+)
>
> diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
> index 73c52f1a2e4c..0d3cc1e79014 100644
> --- a/drivers/mtd/mtdpart.c
> +++ b/drivers/mtd/mtdpart.c
> @@ -861,6 +861,42 @@ static int mtd_part_do_parse(struct mtd_part_parser *parser,
> return ret;
> }
>
> +static bool of_mtd_match_mtd_parser(struct mtd_info *mtd,
> + struct mtd_part_parser *parser)
> +{
> + struct device_node *np;
> + bool ret;
> +
> + np = mtd_get_of_node(mtd);
> + np = of_get_child_by_name(np, "partitions");
> +
> + ret = !!of_match_node(parser->of_match_table, np);
> +
> + of_node_put(np);
> +
> + return ret;
> +}
> +
> +static struct mtd_part_parser *mtd_part_get_parser_by_of(struct mtd_info *mtd)
> +{
> + struct mtd_part_parser *p, *ret = NULL;
> +
> + spin_lock(&part_parser_lock);
> +
> + /* TODO: Pick parser with the best match (score) */
I don't usually like sticking in TODOs for known issues like this on new
code. This one isn't really that hard to solve; there just aren't any
nice helpers for it. I see you even wrote up something on one of the
prior versions.
I might take a look myself at improving your other proposal. I'd rather
give that a chance than take this with a TODO.
> + list_for_each_entry(p, &part_parsers, list) {
> + if (of_mtd_match_mtd_parser(mtd, p) &&
> + try_module_get(p->owner)) {
> + ret = p;
> + break;
> + }
> + }
> +
> + spin_unlock(&part_parser_lock);
> +
> + return ret;
> +}
> +
> /**
> * parse_mtd_partitions - parse MTD partitions
> * @master: the master partition (describes whole MTD device)
Brian
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