On Wed, Aug 2, 2017 at 9:57 PM, Bjorn Andersson
<bjorn.andersson@xxxxxxxxxx> wrote:
> By iterating over all /reserved-memory child nodes and match each one to
> a list of compatibles that we want to treat specially, we can easily
> extend the list of compatibles to handle - without having to resort to
> of_platform_populate() that would create unnecessary platform_devices.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> ---
>
> Changes since v1:
> - New patch
>
> drivers/of/platform.c | 21 +++++++++++++++------
> 1 file changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index b19524623498..8c241a116b08 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -497,23 +497,32 @@ int of_platform_default_populate(struct device_node *root,
> EXPORT_SYMBOL_GPL(of_platform_default_populate);
>
> #ifndef CONFIG_PPC
> +static const char *rmem_compats[] = {
> + "ramoops",
> + NULL
> +};
> +
> static int __init of_platform_default_populate_init(void)
> {
> + struct device_node *rmem_nodes;
> struct device_node *node;
> + int ret;
>
> if (!of_have_populated_dt())
> return -ENODEV;
>
> /*
> - * Handle ramoops explicitly, since it is inside /reserved-memory,
> - * which lacks a "compatible" property.
> + * Handle certain compatibles explicitly, since we don't want to create
> + * platform_devices for every node in /reserved-memory with a
> + * "compatible",
> */
> - node = of_find_node_by_path("/reserved-memory");
> - if (node) {
> - node = of_find_compatible_node(node, NULL, "ramoops");
> - if (node)
> + rmem_nodes = of_find_node_by_path("/reserved-memory");
> + for_each_available_child_of_node(rmem_nodes, node) {
> + ret = of_device_compatible_match(node, rmem_compats);
> + if (ret)
I would just do:
for_each_matching_node(node, ...)
of_platform_device_create(node, NULL, NULL);
I don't think the kernel has to validate that ramoops and any others
we add are children of /reserved-memory. We should only have those
compatibles located there and any other location would be an error.
> of_platform_device_create(node, NULL, NULL);
> }
> + of_node_put(rmem_nodes);
>
> /* Populate everything else. */
> of_platform_default_populate(NULL, NULL, NULL);
> --
> 2.12.0
>
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