Hi Stephen,
On Fri, Oct 28, 2022 at 2:27 AM Stephen Boyd <sboyd@xxxxxxxxxx> wrote:
>
> Quoting Dario Binacchi (2022-10-18 09:03:52)
> > diff --git a/drivers/clk/ti/clk-dra7-atl.c b/drivers/clk/ti/clk-dra7-atl.c
> > index ff4d6a951681..78482d1a4a33 100644
> > --- a/drivers/clk/ti/clk-dra7-atl.c
> > +++ b/drivers/clk/ti/clk-dra7-atl.c
> > @@ -188,24 +188,17 @@ static void __init of_dra7_atl_clock_setup(struct device_node *node)
> > goto cleanup;
> > }
> >
> > - parent_names = kzalloc(sizeof(char *), GFP_KERNEL);
> > -
> > - if (!parent_names)
> > - goto cleanup;
> > -
> > parent_names[0] = of_clk_get_parent_name(node, 0);
>
> Can you use struct clk_parent_data instead and assign index to 0? Then
> we don't even need to use of_clk_get_parent_name() here.
I tried to test your suggestions on another platform (I don't have the
hw to test the driver change) but if I
don't add pdata.name = of_clk_get_parent_name () the board boot up fails.
As far I can see from the clk_core_populate_parent_map()
....
/* Copy everything over because it might be __initdata */
for (i = 0, parent = parents; i < num_parents; i++, parent++) {
parent->index = -1;
if (parent_names) {
/* throw a WARN if any entries are NULL */
WARN(!parent_names[i],
"%s: invalid NULL in %s's .parent_names\n",
__func__, core->name);
ret = clk_cpy_name(&parent->name, parent_names[i],
true);
} else if (parent_data) {
parent->hw = parent_data[i].hw;
parent->index = parent_data[i].index;
ret = clk_cpy_name(&parent->fw_name,
parent_data[i].fw_name, false);
if (!ret)
ret = clk_cpy_name(&parent->name,
parent_data[i].name,
false);
...
The function clk_cpy_name() is called with the parameter "mus_exist"
to true in the path "parent_names" and false
in the path "parent_data". Therefore, in the path "parent_data" it is
allowed that parent-> name is not set.
In doing so, therefore, the change would not even be backward compatible.
So, IMHO, there are 2 possible options:
1 okay to use parent_data, but we keep using of_clk_get_parent_name
() to set parent_data::name.
2 okay to use the version v2 of the patch.
What do you think?
Thanks and regards,
Dario
--
Dario Binacchi
Embedded Linux Developer
dario.binacchi@xxxxxxxxxxxxxxxxxxxx
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