Hi Teresa,

On Tue, Feb 16, 2016 at 11:51:16AM +0100, Teresa Remmet wrote:
> of_fixup_status enables or disables the status property of a
> given node with a device tree fixup.
> 
> Signed-off-by: Teresa Remmet <t.rem...@phytec.de>
> ---
>  commands/Kconfig           |  16 +++++++
>  commands/Makefile          |   1 +
>  commands/of_fixup_status.c | 101 
> +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 118 insertions(+)
>  create mode 100644 commands/of_fixup_status.c
> 
> diff --git a/commands/Kconfig b/commands/Kconfig
> index b4fdc86..9519a44 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -2114,6 +2114,22 @@ config CMD_OF_DISPLAY_TIMINGS
>                 -s path       select display-timings and register oftree fixup
>                 -f dtb        work on dtb. Has no effect on -s option
>  
> +config CMD_OF_FIXUP_STATUS
> +     tristate
> +     select OFTREE
> +     prompt "of_fixup_status"
> +     help
> +       Register a fixup to enable or disable node
> +
> +       Usage: of_fixup_node [-d] path
> +
> +       Options:
> +               -d            disable node
> +               path          Node path or alias
> +
> +       Register a fixup to enable or disable a device tree node.
> +       Nodes are enabled on default. Disabled with -d.
> +
>  config CMD_OFTREE
>       tristate
>       select OFTREE
> diff --git a/commands/Makefile b/commands/Makefile
> index d985341..8975d4b 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -78,6 +78,7 @@ obj-$(CONFIG_CMD_OF_PROPERTY)       += of_property.o
>  obj-$(CONFIG_CMD_OF_NODE)    += of_node.o
>  obj-$(CONFIG_CMD_OF_DUMP)    += of_dump.o
>  obj-$(CONFIG_CMD_OF_DISPLAY_TIMINGS) += of_display_timings.o
> +obj-$(CONFIG_CMD_OF_FIXUP_STATUS)    += of_fixup_status.o
>  obj-$(CONFIG_CMD_MAGICVAR)   += magicvar.o
>  obj-$(CONFIG_CMD_IOMEM)              += iomemport.o
>  obj-$(CONFIG_CMD_LINUX_EXEC) += linux_exec.o
> diff --git a/commands/of_fixup_status.c b/commands/of_fixup_status.c
> new file mode 100644
> index 0000000..03494cc
> --- /dev/null
> +++ b/commands/of_fixup_status.c
> @@ -0,0 +1,101 @@
> +/*
> + * of_fixup_status.c - Register a fixup to enable or disable nodes in the
> + * device tree
> + *
> + * Copyright (c) 2014-2016 PHYTEC Messtechnik GmbH
> + * Author:
> + *   Teresa Remmet
> + *   Wadim Egorov
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#include <common.h>
> +#include <of.h>
> +#include <command.h>
> +#include <malloc.h>
> +#include <complete.h>
> +#include <asm/byteorder.h>
> +#include <linux/err.h>
> +#include <getopt.h>
> +#include <string.h>
> +
> +struct fixup_status_data {
> +     char *node;
> +     bool status;
> +};
> +
> +static int of_fixup_status(struct device_node *root, void *context)
> +{
> +     struct fixup_status_data *data = context;
> +     struct device_node *node;
> +
> +     node = of_find_node_by_path_from(root, data->node);
> +     if (!node) {
> +             pr_err("Could not find node in tree: %s\n", data->node);
> +             return -EINVAL;
> +     }
> +
> +     if (data->status)
> +             return of_device_enable(node);
> +     else
> +             return of_device_disable(node);
> +}
> +
> +static int do_of_fixup_status(int argc, char *argv[])
> +{
> +     int opt;
> +     bool status = 1;
> +     char *node = NULL;
> +     struct fixup_status_data *data;
> +
> +     while ((opt = getopt(argc, argv, "d")) > 0) {
> +             switch (opt) {
> +             case 'd':
> +                     status = 0;
> +                     break;
> +             default:
> +                     return COMMAND_ERROR_USAGE;
> +             }
> +     }
> +
> +     if (optind == argc)
> +             return COMMAND_ERROR_USAGE;
> +
> +     node = xstrdup(argv[optind]);
> +
> +     data = xzalloc(sizeof(*data));
> +     data->node = node;
> +     data->status = status;
> +
> +     of_register_fixup(of_fixup_status, (void *)data);

Could you split this up into a C API and the command code? Being able to
register a fixup to enable/disable nodes could be a useful call from C
aswell.

Sascha


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