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edf3363959
Backport upstream solution that permits to declare nvmem cells with
dynamic partition defined by special parser.
This provide an OF node for NVMEM and connect it to the defined dynamic
partition.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 1a9ee36734)
73 lines
2.3 KiB
Diff
73 lines
2.3 KiB
Diff
From b0321721be50b80c03a51866a94fde4f94690e18 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: Wed, 15 Jun 2022 21:42:59 +0200
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Subject: [PATCH] mtd: allow getting MTD device associated with a specific DT
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node
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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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MTD subsystem API allows interacting with MTD devices (e.g. reading,
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writing, handling bad blocks). So far a random driver could get MTD
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device only by its name (get_mtd_device_nm()). This change allows
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getting them also by a DT node.
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This API is required for drivers handling DT defined MTD partitions in a
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specific way (e.g. U-Boot (sub)partition with environment variables).
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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---
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drivers/mtd/mtdcore.c | 28 ++++++++++++++++++++++++++++
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include/linux/mtd/mtd.h | 1 +
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2 files changed, 29 insertions(+)
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -1067,6 +1067,34 @@ int __get_mtd_device(struct mtd_info *mt
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EXPORT_SYMBOL_GPL(__get_mtd_device);
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/**
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+ * of_get_mtd_device_by_node - obtain an MTD device associated with a given node
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+ *
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+ * @np: device tree node
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+ */
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+struct mtd_info *of_get_mtd_device_by_node(struct device_node *np)
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+{
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+ struct mtd_info *mtd = NULL;
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+ struct mtd_info *tmp;
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+ int err;
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+
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+ mutex_lock(&mtd_table_mutex);
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+
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+ err = -EPROBE_DEFER;
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+ mtd_for_each_device(tmp) {
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+ if (mtd_get_of_node(tmp) == np) {
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+ mtd = tmp;
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+ err = __get_mtd_device(mtd);
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+ break;
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+ }
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+ }
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+
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+ mutex_unlock(&mtd_table_mutex);
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+
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+ return err ? ERR_PTR(err) : mtd;
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+}
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+EXPORT_SYMBOL_GPL(of_get_mtd_device_by_node);
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+
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+/**
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* get_mtd_device_nm - obtain a validated handle for an MTD device by
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* device name
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* @name: MTD device name to open
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -567,6 +567,7 @@ extern int mtd_device_unregister(struct
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extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
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extern int __get_mtd_device(struct mtd_info *mtd);
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extern void __put_mtd_device(struct mtd_info *mtd);
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+extern struct mtd_info *of_get_mtd_device_by_node(struct device_node *np);
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extern struct mtd_info *get_mtd_device_nm(const char *name);
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extern void put_mtd_device(struct mtd_info *mtd);
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