[PATCHv2] commands: add of_display_timings

[Teresa Gamez]

Hello Sascha,

Am Montag, den 29.09.2014, 08:05 +0200 schrieb Sascha Hauer:
> On Fri, Sep 26, 2014 at 01:22:31PM +0200, Teresa Gámez wrote:
> > A lot of boards use display-timings nodes to define the timings of one or more
> > displays. This command makes it possible to list and select displays which are
> > defined in a device tree.
> > 
> > Signed-off-by: Teresa Gámez <t.gamez at phytec.de>
> > ---
> > Changes v2:
> > - removed cast
> > - added free(ftd)
> > - freed root
> > 

...
> > +
> > +static int do_of_display_timings(int argc, char *argv[])
> > +{
> > +	int opt;
> > +	int list = 0;
> > +	int selected = 0;
> > +	int ret = 0;
> > +	struct device_node *root = NULL;
> > +	struct device_node *internal_root = NULL;
> > +	struct device_node *display = NULL;
> > +	struct device_node *timings = NULL;
> > +	char *timingpath = NULL;
> > +	char *dtbfile = NULL;
> > +
> > +	while ((opt = getopt(argc, argv, "sS:lf:")) > 0) {
> > +		switch (opt) {
> > +		case 'l':
> > +			list = 1;
> > +			break;
> > +		case 'f':
> > +			dtbfile = optarg;
> > +			break;
> > +		case 's':
> > +			selected = 1;
> > +			break;
> > +		case 'S':
> > +			timingpath = xzalloc(strlen(optarg) + 1);
> > +			strcpy(timingpath, optarg);
> > +			break;
> 
> You're right, there's no place to free this string.
> 
> BTW we have xstrdup for duplicating strings.
> 
> 
> > +		/*
> > +		 * We set the external node to our internal node as
> > +		 * long as the command runs. This makes life easier to
> > +		 * use of tree functions. We backup the internal root node
> > +		 * and set it back at the end.
> > +		 */
> > +		internal_root = of_get_root_node();
> > +		of_set_root_node(NULL);
> > +		of_set_root_node(root);
> 
> Since the only device tree function you are using is
> for_each_node_by_name(), could you add a:
> 
> #define for_each_node_by_name_from(dn, root, name) \
> 	for (dn = of_find_node_by_name(root, name); dn; \
> 	     dn = of_find_node_by_name(dn, name))
> 
> to include/of.h and remove the temporary overwriting of the
> internal device tree?

I'm also using of_parse_phandle() which calls of_find_node_by_phandle().
And this is using the root_node again.

I can create *_from() functions for both of them as overwriting the root
node is really not pretty..

Teresa


> 
> Sascha
>