84 lines
2.4 KiB
Diff
84 lines
2.4 KiB
Diff
From 6d9434ebb76157071164b32ad03fbed165c74382 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Date: Mon, 24 Feb 2014 19:24:48 -0300
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Subject: of_mtd: Add helpers to get ECC strength and ECC step size
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This commit adds simple helpers to obtain the devicetree properties
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that specify the ECC strength and ECC step size to use on a given
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NAND controller.
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Acked-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
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Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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--- a/drivers/of/of_mtd.c
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+++ b/drivers/of/of_mtd.c
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@@ -50,6 +50,40 @@ int of_get_nand_ecc_mode(struct device_n
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EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
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/**
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+ * of_get_nand_ecc_step_size - Get ECC step size associated to
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+ * the required ECC strength (see below).
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+ * @np: Pointer to the given device_node
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+ *
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+ * return the ECC step size, or errno in error case.
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+ */
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+int of_get_nand_ecc_step_size(struct device_node *np)
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+{
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+ int ret;
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+ u32 val;
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+
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+ ret = of_property_read_u32(np, "nand-ecc-step-size", &val);
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+ return ret ? ret : val;
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+}
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+EXPORT_SYMBOL_GPL(of_get_nand_ecc_step_size);
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+
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+/**
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+ * of_get_nand_ecc_strength - Get required ECC strength over the
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+ * correspnding step size as defined by 'nand-ecc-size'
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+ * @np: Pointer to the given device_node
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+ *
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+ * return the ECC strength, or errno in error case.
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+ */
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+int of_get_nand_ecc_strength(struct device_node *np)
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+{
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+ int ret;
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+ u32 val;
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+
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+ ret = of_property_read_u32(np, "nand-ecc-strength", &val);
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+ return ret ? ret : val;
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+}
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+EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
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+
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+/**
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* of_get_nand_bus_width - Get nand bus witdh for given device_node
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* @np: Pointer to the given device_node
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*
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--- a/include/linux/of_mtd.h
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+++ b/include/linux/of_mtd.h
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@@ -13,6 +13,8 @@
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#include <linux/of.h>
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int of_get_nand_ecc_mode(struct device_node *np);
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+int of_get_nand_ecc_step_size(struct device_node *np);
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+int of_get_nand_ecc_strength(struct device_node *np);
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int of_get_nand_bus_width(struct device_node *np);
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bool of_get_nand_on_flash_bbt(struct device_node *np);
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@@ -23,6 +25,16 @@ static inline int of_get_nand_ecc_mode(s
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return -ENOSYS;
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}
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+static inline int of_get_nand_ecc_step_size(struct device_node *np)
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+{
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+ return -ENOSYS;
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+}
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+
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+static inline int of_get_nand_ecc_strength(struct device_node *np)
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+{
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+ return -ENOSYS;
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+}
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+
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static inline int of_get_nand_bus_width(struct device_node *np)
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{
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return -ENOSYS;
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