linux-kernel - [PATCH 1/2] mtd: call of_platform

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Message-Id: <20220406143225.28107-1-zajec5@gmail.com>
Date:   Wed,  6 Apr 2022 16:32:24 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     Tom Rini <trini@...sulko.com>, linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        u-boot@...ts.denx.de, devicetree@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 1/2] mtd: call of_platform_populate() for MTD partitions

From: Rafał Miłecki <rafal@...ecki.pl>

Until this change MTD subsystem supported handling partitions only with
MTD partitions parsers. That's a specific / limited API designed around
partitions.

Some MTD partitions may however require different handling. They may
contain specific data that needs to be parsed and somehow extracted. For
that purpose MTD subsystem should allow binding of standard platform
drivers.

An example can be U-Boot (sub)partition with environment variables.
There exist a "u-boot,env" DT binding for MTD (sub)partition that
requires an NVMEM driver.

Ref: 5db1c2dbc04c ("dt-bindings: nvmem: add U-Boot environment variables binding")
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 drivers/mtd/mtdpart.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 357661b62c94..9fce946fa69c 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -17,6 +17,7 @@
 #include <linux/mtd/partitions.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include "mtdcore.h"
 
@@ -593,6 +594,7 @@ static int mtd_part_of_parse(struct mtd_info *master,
 			continue;
 		ret = mtd_part_do_parse(parser, master, pparts, NULL);
 		if (ret > 0) {
+			of_platform_populate(np, NULL, NULL, &master->dev);
 			of_node_put(np);
 			return ret;
 		}
@@ -600,6 +602,7 @@ static int mtd_part_of_parse(struct mtd_info *master,
 		if (ret < 0 && !err)
 			err = ret;
 	}
+	of_platform_populate(np, NULL, NULL, &master->dev);
 	of_node_put(np);
 
 	/*
-- 
2.34.1