linux-kernel - [PATCH v2] mtd: rawnand: ams-delta: Drop board specific partition info

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Message-Id: <20190324223344.24590-1-jmkrzyszt@gmail.com>
Date:   Sun, 24 Mar 2019 23:33:44 +0100
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Boris Brezillon <bbrezillon@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mtd@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: [PATCH v2] mtd: rawnand: ams-delta: Drop board specific partition info

After recent modifications, only a hardcoded partition info makes
the driver device specific.  Other than that, the driver uses GPIO
exclusively and can be used on any hardware.

Drop the partition info and use MTD partition parser with default list
of parser names instead.  For the OF parser to work correctly, pass
device of_node to mtd.

Amstrad Delta users should append the following partition info to their
kernel command line, possibly by embedding it in CONFIG_CMDLINE:

mtdparts=ams-delta-nand:3584k(Kernel),256k(u-boot),256k(u-boot_params),\
256k(Amstrad_LDR),27m(File_system),768k(PBL_reserved).

For their convenience, CONFIG_MTD_CMDLINE_PARTS symbol is selected
automatically from that board Kconfig if this NAND driver is also
selected.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc: Tony Lindgren <tony@...mide.com>
---
CHangelog:
v1->v2:
- fix a typo poined out by Aaro - thanks!
- fix device_node not passed to OF parser via mtd_info
- commit message reworded and reformatted a bit for better readability

 arch/arm/mach-omap1/Kconfig      |  1 +
 drivers/mtd/nand/raw/ams-delta.c | 29 ++---------------------------
 2 files changed, 3 insertions(+), 27 deletions(-)

diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig
index c4694f26b5c4..62cf20f22828 100644
--- a/arch/arm/mach-omap1/Kconfig
+++ b/arch/arm/mach-omap1/Kconfig
@@ -171,6 +171,7 @@ config MACH_AMS_DELTA
 	select LEDS_GPIO_REGISTER
 	select REGULATOR
 	select REGULATOR_FIXED_VOLTAGE
+	select MTD_CMDLINE_PARTS if MTD_NAND_AMS_DELTA
 	help
 	  Support for the Amstrad E3 (codename Delta) videophone. Say Y here
 	  if you have such a device.
diff --git a/drivers/mtd/nand/raw/ams-delta.c b/drivers/mtd/nand/raw/ams-delta.c
index 8312182088c1..e0f09179bbda 100644
--- a/drivers/mtd/nand/raw/ams-delta.c
+++ b/drivers/mtd/nand/raw/ams-delta.c
@@ -41,31 +41,6 @@ struct ams_delta_nand {
 	bool			data_in;
 };
 
-/*
- * Define partitions for flash devices
- */
-
-static const struct mtd_partition partition_info[] = {
-	{ .name		= "Kernel",
-	  .offset	= 0,
-	  .size		= 3 * SZ_1M + SZ_512K },
-	{ .name		= "u-boot",
-	  .offset	= 3 * SZ_1M + SZ_512K,
-	  .size		= SZ_256K },
-	{ .name		= "u-boot params",
-	  .offset	= 3 * SZ_1M + SZ_512K + SZ_256K,
-	  .size		= SZ_256K },
-	{ .name		= "Amstrad LDR",
-	  .offset	= 4 * SZ_1M,
-	  .size		= SZ_256K },
-	{ .name		= "File system",
-	  .offset	= 4 * SZ_1M + 1 * SZ_256K,
-	  .size		= 27 * SZ_1M },
-	{ .name		= "PBL reserved",
-	  .offset	= 32 * SZ_1M - 3 * SZ_256K,
-	  .size		=  3 * SZ_256K },
-};
-
 static void ams_delta_write_commit(struct ams_delta_nand *priv)
 {
 	gpiod_set_value(priv->gpiod_nwe, 0);
@@ -238,6 +213,7 @@ static int ams_delta_init(struct platform_device *pdev)
 	mtd->dev.parent = &pdev->dev;
 
 	nand_set_controller_data(this, priv);
+	nand_set_flash_node(this, pdev->dev.of_node);
 
 	priv->gpiod_rdy = devm_gpiod_get_optional(&pdev->dev, "rdy", GPIOD_IN);
 	if (IS_ERR(priv->gpiod_rdy)) {
@@ -315,8 +291,7 @@ static int ams_delta_init(struct platform_device *pdev)
 		return err;
 
 	/* Register the partitions */
-	err = mtd_device_register(mtd, partition_info,
-				  ARRAY_SIZE(partition_info));
+	err = mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
 	if (err)
 		goto err_nand_cleanup;
 
-- 
2.19.2