of/mtd/nand: add generic bindings and helpers (770d7c39) · Commits · 戴 / test

Documentation/devicetree/bindings/mtd/nand.txt

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		* MTD generic binding

		- nand-ecc-mode : String, operation mode of the NAND ecc mode.
		Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
		"soft_bch".
		- nand-bus-width : 8 or 16 bus width if not present 8
		- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false

drivers/of/Kconfig

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		@@ -90,4 +90,8 @@ config OF_PCI_IRQ
		help
		OpenFirmware PCI IRQ routing helpers

		config OF_MTD
		depends on MTD
		def_bool y

		endmenu # OF

drivers/of/Makefile

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		@@ -12,3 +12,4 @@ obj-$(CONFIG_OF_SELFTEST) += selftest.o
		obj-$(CONFIG_OF_MDIO) += of_mdio.o
		obj-$(CONFIG_OF_PCI) += of_pci.o
		obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
		obj-$(CONFIG_OF_MTD) += of_mtd.o

drivers/of/of_mtd.c

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		/*
		* Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
		*
		* OF helpers for mtd.
		*
		* This file is released under the GPLv2
		*
		*/
		#include <linux/kernel.h>
		#include <linux/of_mtd.h>
		#include <linux/mtd/nand.h>
		#include <linux/export.h>

		/**
		* It maps 'enum nand_ecc_modes_t' found in include/linux/mtd/nand.h
		* into the device tree binding of 'nand-ecc', so that MTD
		* device driver can get nand ecc from device tree.
		*/
		static const char *nand_ecc_modes[] = {
		[NAND_ECC_NONE] = "none",
		[NAND_ECC_SOFT] = "soft",
		[NAND_ECC_HW] = "hw",
		[NAND_ECC_HW_SYNDROME] = "hw_syndrome",
		[NAND_ECC_HW_OOB_FIRST] = "hw_oob_first",
		[NAND_ECC_SOFT_BCH] = "soft_bch",
		};

		/**
		* of_get_nand_ecc_mode - Get nand ecc mode for given device_node
		* @np: Pointer to the given device_node
		*
		* The function gets ecc mode string from property 'nand-ecc-mode',
		* and return its index in nand_ecc_modes table, or errno in error case.
		*/
		const int of_get_nand_ecc_mode(struct device_node *np)
		{
		const char *pm;
		int err, i;

		err = of_property_read_string(np, "nand-ecc-mode", &pm);
		if (err < 0)
		return err;

		for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
		if (!strcasecmp(pm, nand_ecc_modes[i]))
		return i;

		return -ENODEV;
		}
		EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);

		/**
		* of_get_nand_bus_width - Get nand bus witdh for given device_node
		* @np: Pointer to the given device_node
		*
		* return bus width option, or errno in error case.
		*/
		int of_get_nand_bus_width(struct device_node *np)
		{
		u32 val;

		if (of_property_read_u32(np, "nand-bus-width", &val))
		return 8;

		switch(val) {
		case 8:
		case 16:
		return val;
		default:
		return -EIO;
		}
		}
		EXPORT_SYMBOL_GPL(of_get_nand_bus_width);

		/**
		* of_get_nand_on_flash_bbt - Get nand on flash bbt for given device_node
		* @np: Pointer to the given device_node
		*
		* return true if present false other wise
		*/
		bool of_get_nand_on_flash_bbt(struct device_node *np)
		{
		return of_property_read_bool(np, "nand-on-flash-bbt");
		}
		EXPORT_SYMBOL_GPL(of_get_nand_on_flash_bbt);

include/linux/of_mtd.h

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		/*
		* Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
		*
		* OF helpers for mtd.
		*
		* This file is released under the GPLv2
		*/

		#ifndef __LINUX_OF_MTD_H
		#define __LINUX_OF_NET_H

		#ifdef CONFIG_OF_MTD
		#include <linux/of.h>
		extern const int of_get_nand_ecc_mode(struct device_node *np);
		int of_get_nand_bus_width(struct device_node *np);
		bool of_get_nand_on_flash_bbt(struct device_node *np);
		#endif

		#endif /* __LINUX_OF_MTD_H */

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