On Sun, Feb 22, 2015 at 7:41 PM, Hyungwon Hwang <human.hwang@xxxxxxxxxxx> wrote:
> When there are multiple ports or multiple endpoints in a port, they have to be
> distinguished by the value of reg property. It is common. The drivers can get
> the specific endpoint in the specific port via this function. Now the drivers
> have to implement this code in themselves or have to force the order of dt nodes
> to get the right node.
>
> Signed-off-by: Hyungwon Hwang <human.hwang@xxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
I'm not applying as there is no user, so apply this patch along with a
user of the function.
Rob
> ---
> Changes for v2:
> - Add the empty verion of the new function
> - Remove the unnecessary type casting from signed int to unsigned int
> drivers/of/base.c | 33 +++++++++++++++++++++++++++++++++
> include/linux/of_graph.h | 8 ++++++++
> 2 files changed, 41 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 0a8aeb8..8f6bc41 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2156,6 +2156,39 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
> EXPORT_SYMBOL(of_graph_get_next_endpoint);
>
> /**
> + * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers
> + * @parent: pointer to the parent device node
> + * @port_reg: identifier (value of reg property) of the parent port node
> + * @reg: identifier (value of reg property) of the endpoint node
> + *
> + * Return: An 'endpoint' node pointer which is identified by reg and at the same
> + * is the child of a port node identified by port_reg. reg and port_reg are
> + * ignored when they are -1.
> + */
> +struct device_node *of_graph_get_endpoint_by_regs(
> + const struct device_node *parent, int port_reg, int reg)
> +{
> + struct of_endpoint endpoint;
> + struct device_node *node, *prev_node = NULL;
> +
> + while (1) {
> + node = of_graph_get_next_endpoint(parent, prev_node);
> + of_node_put(prev_node);
> + if (!node)
> + break;
> +
> + of_graph_parse_endpoint(node, &endpoint);
> + if (((port_reg == -1) || (endpoint.port == port_reg)) &&
> + ((reg == -1) || (endpoint.id == reg)))
> + return node;
> +
> + prev_node = node;
> + }
> +
> + return NULL;
> +}
> +
> +/**
> * of_graph_get_remote_port_parent() - get remote port's parent node
> * @node: pointer to a local endpoint device_node
> *
> diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
> index befef42..e859eb7 100644
> --- a/include/linux/of_graph.h
> +++ b/include/linux/of_graph.h
> @@ -31,6 +31,8 @@ int of_graph_parse_endpoint(const struct device_node *node,
> struct of_endpoint *endpoint);
> struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
> struct device_node *previous);
> +struct device_node *of_graph_get_endpoint_by_regs(
> + const struct device_node *parent, int port_reg, int reg);
> struct device_node *of_graph_get_remote_port_parent(
> const struct device_node *node);
> struct device_node *of_graph_get_remote_port(const struct device_node *node);
> @@ -49,6 +51,12 @@ static inline struct device_node *of_graph_get_next_endpoint(
> return NULL;
> }
>
> +struct device_node *of_graph_get_endpoint_by_regs(
> + const struct device_node *parent, int port_reg, int reg)
> +{
> + return NULL;
> +}
> +
> static inline struct device_node *of_graph_get_remote_port_parent(
> const struct device_node *node)
> {
> --
> 1.9.1
>
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
