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-rw-r--r--drivers/mtd/nand/ecc.c31
-rw-r--r--include/linux/mtd/nand.h1
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mtd/nand/ecc.c b/drivers/mtd/nand/ecc.c
index 078f5ec38de3..5250764cedee 100644
--- a/drivers/mtd/nand/ecc.c
+++ b/drivers/mtd/nand/ecc.c
@@ -699,6 +699,37 @@ void nand_ecc_put_on_host_hw_engine(struct nand_device *nand)
}
EXPORT_SYMBOL(nand_ecc_put_on_host_hw_engine);
+/*
+ * In the case of a pipelined engine, the device registering the ECC
+ * engine is not necessarily the ECC engine itself but may be a host controller.
+ * It is then useful to provide a helper to retrieve the right device object
+ * which actually represents the ECC engine.
+ */
+struct device *nand_ecc_get_engine_dev(struct device *host)
+{
+ struct platform_device *ecc_pdev;
+ struct device_node *np;
+
+ /*
+ * If the device node contains this property, it means we need to follow
+ * it in order to get the right ECC engine device we are looking for.
+ */
+ np = of_parse_phandle(host->of_node, "nand-ecc-engine", 0);
+ if (!np)
+ return host;
+
+ ecc_pdev = of_find_device_by_node(np);
+ if (!ecc_pdev) {
+ of_node_put(np);
+ return NULL;
+ }
+
+ platform_device_put(ecc_pdev);
+ of_node_put(np);
+
+ return &ecc_pdev->dev;
+}
+
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Miquel Raynal <[email protected]>");
MODULE_DESCRIPTION("Generic ECC engine");
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index b617efa0a881..615b3e3a3920 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -309,6 +309,7 @@ struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand);
struct nand_ecc_engine *nand_ecc_get_on_die_hw_engine(struct nand_device *nand);
struct nand_ecc_engine *nand_ecc_get_on_host_hw_engine(struct nand_device *nand);
void nand_ecc_put_on_host_hw_engine(struct nand_device *nand);
+struct device *nand_ecc_get_engine_dev(struct device *host);
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
struct nand_ecc_engine *nand_ecc_sw_hamming_get_engine(void);