On 2015년 06월 23일 09:19, Dave Airlie wrote: > 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. Yes I do. I should have tested the modular build. Sorry for this. Thanks, Inki Dae > > 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 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in
