Re: [PATCH 1/2] commands: Add of_fixup_status

[Sascha Hauer <s.hauer@pengutronix.de>]

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.remmet@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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