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afc1839181
This is required for non-parser drivers handling MTD devices.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 41e1e838fb)
73 lines
2.3 KiB
Diff
73 lines
2.3 KiB
Diff
From bcdf0315a61a29eb753a607d3a85a4032de72d94 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 10 May 2022 15:12:59 +0200
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Subject: [PATCH] mtd: call of_platform_populate() for MTD partitions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Until this change MTD subsystem supported handling partitions only with
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MTD partitions parsers. That's a specific / limited API designed around
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partitions.
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Some MTD partitions may however require different handling. They may
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contain specific data that needs to be parsed and somehow extracted. For
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that purpose MTD subsystem should allow binding of standard platform
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drivers.
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An example can be U-Boot (sub)partition with environment variables.
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There exist a "u-boot,env" DT binding for MTD (sub)partition that
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requires an NVMEM driver.
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Ref: 5db1c2dbc04c ("dt-bindings: nvmem: add U-Boot environment variables binding")
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Link: https://lore.kernel.org/linux-mtd/20220510131259.555-1-zajec5@gmail.com
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---
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drivers/mtd/mtdpart.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -17,6 +17,7 @@
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#include <linux/mtd/partitions.h>
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#include <linux/err.h>
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#include <linux/of.h>
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+#include <linux/of_platform.h>
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#include "mtdcore.h"
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@@ -893,10 +894,16 @@ static int mtd_part_of_parse(struct mtd_
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struct mtd_part_parser *parser;
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struct device_node *np;
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struct property *prop;
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+ struct device *dev;
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const char *compat;
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const char *fixed = "fixed-partitions";
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int ret, err = 0;
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+ dev = &master->dev;
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+ /* Use parent device (controller) if the top level MTD is not registered */
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+ if (!IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) && !mtd_is_partition(master))
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+ dev = master->dev.parent;
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+
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np = mtd_get_of_node(master);
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if (mtd_is_partition(master))
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of_node_get(np);
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@@ -909,6 +916,7 @@ static int mtd_part_of_parse(struct mtd_
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continue;
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ret = mtd_part_do_parse(parser, master, pparts, NULL);
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if (ret > 0) {
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+ of_platform_populate(np, NULL, NULL, dev);
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of_node_put(np);
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return ret;
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}
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@@ -916,6 +924,7 @@ static int mtd_part_of_parse(struct mtd_
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if (ret < 0 && !err)
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err = ret;
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}
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+ of_platform_populate(np, NULL, NULL, dev);
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of_node_put(np);
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/*
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