linux-kernel - [PATCH v3] mtd: rawnand: ams-delta: Drop board specific partition info

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Date:   Wed, 24 Apr 2019 20:02:12 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <bbrezillon@...nel.org>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.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 v3] 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 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, that information is added to the board Kconfig
entry help text, as well as CONFIG_MTD_CMDLINE_PARTS symbol is selected
automatically from the board Kconfig entry if the NAND driver is also
selected.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc: Tony Lindgren <tony@...mide.com>
Cc: Aaro Koskinen <aaro.koskinen@....fi>
---
Changelog:
v2->v3:
- add information on the requirement for passing partition info via
  kernel command line to the board Kconfig entry help text
v1->v2:
- fix a typo poitned 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      |  7 ++++++-
 drivers/mtd/nand/raw/ams-delta.c | 29 ++---------------------------
 2 files changed, 8 insertions(+), 28 deletions(-)

diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig
index c4694f26b5c4..41a47d251cac 100644
--- a/arch/arm/mach-omap1/Kconfig
+++ b/arch/arm/mach-omap1/Kconfig
@@ -164,17 +164,22 @@ config MACH_NOKIA770
 	  have such a device.
 
 config MACH_AMS_DELTA
-	bool "Amstrad E3 (Delta)"
+	bool "Amstrad E3 (Delta) - see help for important information"
 	depends on ARCH_OMAP1 && ARCH_OMAP15XX
 	select FIQ
 	select GPIO_GENERIC_PLATFORM
 	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.
 
+	  If you are using built-in NAND, append the following partition
+	  info to kernel command line:
+	  mtdparts=ams-delta-nand:3584k(Kernel),256k(u-boot),256k(u-boot_params),256k(Amstrad_LDR),27m(File_system),768k(PBL_reserved)
+
 config MACH_OMAP_GENERIC
 	bool "Generic OMAP board"
 	depends on ARCH_OMAP1 && (ARCH_OMAP15XX || ARCH_OMAP16XX)
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;
 
-- 
2.21.0