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From: Stefan Agner <stefan@agner.ch>
To: boris.brezillon@bootlin.com, dwmw2@infradead.org,
	computersforpeace@gmail.com, marek.vasut@gmail.com,
	robh+dt@kernel.org, mark.rutland@arm.com,
	thierry.reding@gmail.com
Cc: dev@lynxeye.de, miquel.raynal@bootlin.com, richard@nod.at,
	marcel@ziswiler.com, krzk@kernel.org, digetx@gmail.com,
	benjamin.lindqvist@endian.se, jonathanh@nvidia.com,
	pdeschrijver@nvidia.com, pgaikwad@nvidia.com,
	mirza.krak@gmail.com, stefan@agner.ch,
	linux-mtd@lists.infradead.org, linux-tegra@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 2/6] mtd: rawnand: add an option to specify NAND chip as a boot device
Date: Fri,  1 Jun 2018 00:16:33 +0200	[thread overview]
Message-ID: <20180531221637.6017-3-stefan@agner.ch> (raw)
In-Reply-To: <20180531221637.6017-1-stefan@agner.ch>

Allow to define a NAND chip as a boot device. This can be helpful
for the selection of the ECC algorithm and strength in case the boot
ROM supports only a subset of controller provided options.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
 Documentation/devicetree/bindings/mtd/nand.txt | 4 ++++
 drivers/mtd/nand/raw/nand_base.c               | 3 +++
 include/linux/mtd/rawnand.h                    | 6 ++++++
 3 files changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/nand.txt b/Documentation/devicetree/bindings/mtd/nand.txt
index 8bb11d809429..8daf81b9748c 100644
--- a/Documentation/devicetree/bindings/mtd/nand.txt
+++ b/Documentation/devicetree/bindings/mtd/nand.txt
@@ -43,6 +43,10 @@ Optional NAND chip properties:
 		     This is particularly useful when only the in-band area is
 		     used by the upper layers, and you want to make your NAND
 		     as reliable as possible.
+- nand-is-boot-medium: Whether the NAND chip is a boot medium. Drivers might use
+		       this information to select ECC algorithms supported by
+		       the boot ROM or similar restrictions.
+
 - nand-rb: shall contain the native Ready/Busy ids.
 
 The ECC strength and ECC step size properties define the correction capability
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 9eb5678dd6d0..c8fb7c9855e2 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5826,6 +5826,9 @@ static int nand_dt_init(struct nand_chip *chip)
 	if (of_get_nand_bus_width(dn) == 16)
 		chip->options |= NAND_BUSWIDTH_16;
 
+	if (of_property_read_bool(dn, "nand-is-boot-medium"))
+		chip->options |= NAND_IS_BOOT_MEDIUM;
+
 	if (of_get_nand_on_flash_bbt(dn))
 		chip->bbt_options |= NAND_BBT_USE_FLASH;
 
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 6a82da8c44ce..8e54fcf2fa94 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -212,6 +212,12 @@ enum nand_ecc_algo {
  */
 #define NAND_WAIT_TCCS		0x00200000
 
+/*
+ * Whether the NAND chip is a boot medium. Drivers might use this information
+ * to select ECC algorithms supported by the boot ROM or similar restrictions.
+ */
+#define NAND_IS_BOOT_MEDIUM	0x00400000
+
 /* Options set by nand scan */
 /* Nand scan has allocated controller struct */
 #define NAND_CONTROLLER_ALLOC	0x80000000
-- 
2.17.0

  parent reply	other threads:[~2018-05-31 22:17 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-31 22:16 [PATCH v3 0/6] mtd: rawnand: add NVIDIA Tegra NAND flash support Stefan Agner
2018-05-31 22:16 ` [PATCH v3 1/6] mtd: rawnand: add Reed-Solomon error correction algorithm Stefan Agner
2018-06-01  7:26   ` Boris Brezillon
2018-06-01  9:25     ` Boris Brezillon
2018-06-01 13:34       ` Stefan Agner
2018-06-01 13:43         ` Boris Brezillon
2018-05-31 22:16 ` Stefan Agner [this message]
2018-06-01  7:26   ` [PATCH v3 2/6] mtd: rawnand: add an option to specify NAND chip as a boot device Boris Brezillon
2018-06-05 20:11   ` Rob Herring
2018-06-06  7:28     ` Boris Brezillon
2018-05-31 22:16 ` [PATCH v3 3/6] mtd: rawnand: tegra: add devicetree binding Stefan Agner
2018-06-01  7:30   ` Boris Brezillon
2018-06-05 20:19     ` Dmitry Osipenko
2018-06-06 10:39       ` Thierry Reding
2018-06-06 10:45         ` Boris Brezillon
2018-06-06 11:07           ` Thierry Reding
2018-06-06 12:14             ` Stefan Agner
2018-06-06 12:31               ` Boris Brezillon
2018-06-05 20:13   ` Rob Herring
2018-05-31 22:16 ` [PATCH v3 4/6] mtd: rawnand: add NVIDIA Tegra NAND Flash controller driver Stefan Agner
2018-06-01  9:20   ` Dmitry Osipenko
2018-06-08 21:51     ` Stefan Agner
2018-06-09  5:52       ` Boris Brezillon
2018-06-09  6:23         ` Stefan Agner
2018-06-09  6:41           ` Boris Brezillon
2018-06-09  6:46             ` Boris Brezillon
2018-06-09  6:55               ` Boris Brezillon
2018-06-09  6:51             ` Stefan Agner
2018-06-09 12:21       ` Dmitry Osipenko
2018-06-10 11:09         ` Stefan Agner
2018-06-10 15:00           ` Dmitry Osipenko
2018-06-10 15:32             ` Boris Brezillon
2018-06-11 11:45               ` Dmitry Osipenko
2018-06-11 11:50                 ` Boris Brezillon
2018-06-11 13:10                   ` Dmitry Osipenko
2018-06-04 17:16   ` Randolph Maaßen
2018-06-04 20:56     ` Stefan Agner
2018-06-09  5:55   ` Boris Brezillon
2018-06-09  7:18   ` Boris Brezillon
2018-05-31 22:16 ` [PATCH v3 5/6] ARM: dts: tegra: add Tegra20 NAND flash controller node Stefan Agner
2018-05-31 22:16 ` [PATCH v3 6/6] ARM: dts: tegra: enable NAND flash on Colibri T20 Stefan Agner

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