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80 lines
2.4 KiB
80 lines
2.4 KiB
From eb7f9115409710732ebc4dfe1be629252280910e Mon Sep 17 00:00:00 2001
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From: Boris BREZILLON <boris.brezillon@free-electrons.com>
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Date: Mon, 28 Jul 2014 14:47:04 +0200
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Subject: [PATCH] of: mtd: Add NAND randomizer mode retrieval
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Add a of_get_nand_rnd_mode() helper function.
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Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/of/of_mtd.c | 35 +++++++++++++++++++++++++++++++++++
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include/linux/of_mtd.h | 6 ++++++
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2 files changed, 41 insertions(+)
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--- a/drivers/of/of_mtd.c
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+++ b/drivers/of/of_mtd.c
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@@ -84,6 +84,41 @@ int of_get_nand_ecc_strength(struct devi
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EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
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/**
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+ * It maps 'enum nand_rnd_modes_t' found in include/linux/mtd/nand.h
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+ * into the device tree binding of 'nand-rnd', so that MTD
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+ * device driver can get nand rnd from device tree.
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+ */
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+static const char *nand_rnd_modes[] = {
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+ [NAND_RND_NONE] = "none",
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+ [NAND_RND_SOFT] = "soft",
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+ [NAND_RND_HW] = "hw",
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+};
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+
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+/**
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+ * of_get_nand_rnd_mode - Get nand randomizer mode for given device_node
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+ * @np: Pointer to the given device_node
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+ *
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+ * The function gets randomizer mode string from property 'nand-rnd-mode',
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+ * and return its index in nand_rnd_modes table, or errno in error case.
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+ */
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+int of_get_nand_rnd_mode(struct device_node *np)
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+{
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+ const char *pm;
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+ int err, i;
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+
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+ err = of_property_read_string(np, "nand-rnd-mode", &pm);
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+ if (err < 0)
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+ return err;
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+
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+ for (i = 0; i < ARRAY_SIZE(nand_rnd_modes); i++)
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+ if (!strcasecmp(pm, nand_rnd_modes[i]))
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+ return i;
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+
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+ return -ENODEV;
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+}
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+EXPORT_SYMBOL_GPL(of_get_nand_rnd_mode);
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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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@@ -15,6 +15,7 @@
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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_rnd_mode(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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@@ -34,6 +35,11 @@ static inline int of_get_nand_ecc_streng
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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_rnd_mode(struct device_node *np)
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+{
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+ return -ENOSYS;
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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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