On 12 June 2015 at 22:59, 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+dt@xxxxxxxxxx> FYI, Since I'm merging this via exynos-next into my tree, it broke module builds of exynos, because it doesn't export the symbol it adds, I've added a patch to my -next tree to fix it up. Inki, in future can you add a modular build to pre-pull testing. Dave. > --- > Changes before: > - Refer https://patchwork.kernel.org/patch/6191751/ > Changes for v6: > - None > 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 99764db..f3b583b 100644 > --- a/drivers/of/base.c > +++ b/drivers/of/base.c > @@ -2233,6 +2233,39 @@ 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 7bc92e0..1c1d5b9 100644 > --- a/include/linux/of_graph.h > +++ b/include/linux/of_graph.h > @@ -45,6 +45,8 @@ int of_graph_parse_endpoint(const struct device_node *node, > struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); > 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); > @@ -69,6 +71,12 @@ 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 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel -- To unsubscribe from this list: send the line "unsubscribe devicetree" in
