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    Subject[PATCH V2 1/6] dt: add property iteration helpers
    Date
    This patch adds macros of_property_for_each_u32() and
    of_property_for_each_string(), which iterate over an array of values
    within a device-tree property. Usage is for example:

    struct property *prop;
    const __be32 *p;
    u32 u;
    of_property_for_each_u32(np, "propname", prop, p, u)
    printk("U32 value: %x\n", u);

    struct property *prop;
    const char *s;
    of_property_for_each_string(np, "propname", prop, s)
    printk("String value: %s\n", s);

    Based on work by Rob Herring <robherring2@gmail.com>

    Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
    ---
    v2: Simplified the implementation per suggestion by Rob Herring.
    ---
    include/linux/of_iter_prop.h | 101 ++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 101 insertions(+), 0 deletions(-)
    create mode 100644 include/linux/of_iter_prop.h

    diff --git a/include/linux/of_iter_prop.h b/include/linux/of_iter_prop.h
    new file mode 100644
    index 0000000..e3df23c
    --- /dev/null
    +++ b/include/linux/of_iter_prop.h
    @@ -0,0 +1,101 @@
    +/*
    + * Copyright (c) 2011-2012 NVIDIA CORPORATION. All rights reserved.
    + *
    + * Iterate over properties that store arrays.
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms and conditions of the GNU General Public License,
    + * version 2, as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope it will be useful, but WITHOUT
    + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
    + * more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program. If not, see <http://www.gnu.org/licenses/>.
    + */
    +#ifndef __OF_ITER_PROP_H__
    +#define __OF_ITER_PROP_H__
    +
    +#include <linux/of.h>
    +
    +#ifdef CONFIG_OF
    +static inline const __be32 *of_prop_next_u32(struct property *prop,
    + const __be32 *cur, u32 *pu)
    +{
    + const void *curv = cur;
    +
    + if (!prop)
    + return NULL;
    +
    + if (!cur) {
    + curv = prop->value;
    + goto out_val;
    + }
    +
    + curv += sizeof(*cur);
    + if (curv >= prop->value + prop->length)
    + return NULL;
    +
    +out_val:
    + *pu = be32_to_cpup(curv);
    + return curv;
    +}
    +
    +/*
    + * struct property *prop;
    + * const __be32 *p;
    + * u32 u;
    + *
    + * of_property_for_each_u32(np, "propname", prop, p, u)
    + * printk("U32 value: %x\n", u);
    + */
    +#define of_property_for_each_u32(np, propname, prop, p, u) \
    + for (prop = of_find_property(np, propname, NULL), \
    + p = of_prop_next_u32(prop, NULL, &u); \
    + p; \
    + p = of_prop_next_u32(prop, p, &u))
    +
    +static inline const char *of_prop_next_string(struct property *prop,
    + const char *cur)
    +{
    + const void *curv = cur;
    +
    + if (!prop)
    + return NULL;
    +
    + if (!cur)
    + return prop->value;
    +
    + curv += strlen(cur) + 1;
    + if (curv >= prop->value + prop->length)
    + return NULL;
    +
    + return curv;
    +}
    +
    +/*
    + * struct property *prop;
    + * const char *s;
    + *
    + * of_property_for_each_string(np, "propname", prop, s)
    + * printk("String value: %s\n", s);
    + */
    +#define of_property_for_each_string(np, propname, prop, s) \
    + for (prop = of_find_property(np, propname, NULL), \
    + s = of_prop_next_string(prop, NULL); \
    + s; \
    + s = of_prop_next_string(prop, s))
    +
    +#else
    +
    +#define of_property_for_each_u32(np, propname, prop, p, u) \
    + while (0)
    +
    +#define of_property_for_each_string(np, propname, prop, s) \
    + while (0)
    +
    +#endif /* CONFIG_OF */
    +
    +#endif /* __OF_ITER_PROP_H__ */
    --
    1.7.0.4


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