[PATCH v6 06/15] of: add helper for getting endpoint node of specific identifiers

[Inki Dae]

On 2015년 06월 23일 09:19, Dave Airlie wrote:
> On 12 June 2015 at 22:59, Hyungwon Hwang <human.hwang at samsung.com> 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 at samsung.com>
>> Acked-by: Rob Herring <robh+dt at kernel.org>
> 
> 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
>>
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