2022-08-17 18:44:52 +00:00
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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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2022-12-31 15:29:53 +00:00
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@@ -1229,6 +1229,34 @@ int __get_mtd_device(struct mtd_info *mt
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2022-08-17 18:44:52 +00:00
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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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@@ -682,6 +682,7 @@ 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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