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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-Network-Message-Id: d2462796-9874-4e9b-a8e3-08dc2064eb43 X-MS-Exchange-CrossTenant-AuthSource: TYCPR01MB10914.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jan 2024 00:54:59.6862 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: aKzr4mCHETD2SwEsu1d2aEmm/BzaizXtPSq2h3+y6AAB/cqrtVa5qjl5FJ3PnrOU84LUz22GZ7M4XOuTem4cwoJc5hiHkYr7Hq8Zwq6KovEMtR+RdlIAZ8ngjVkfDZr3 X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYAPR01MB5996 We already have of_graph_get_next_endpoint(), but it is not intuitive to use. (X) node { (Y) ports { port@0 { endpoint { remote-endpoint = ...; };}; (A1) port@1 { endpoint { remote-endpoint = ...; }; (A2) endpoint { remote-endpoint = ...; };}; (B) port@2 { endpoint { remote-endpoint = ...; };}; }; }; For example, if I want to handle port@1's 2 endpoints (= A1, A2), I want to use like below A1 = of_graph_get_next_endpoint(port1, NULL); A2 = of_graph_get_next_endpoint(port1, A1); But 1st one will be error, because of_graph_get_next_endpoint() requested "parent" means "node" (X) or "ports" (Y), not "port". Below are OK of_graph_get_next_endpoint(node, NULL); // node/ports/port@0/endpoint of_graph_get_next_endpoint(ports, NULL); // node/ports/port@0/endpoint In other words, we can't handle A1/A2 directly via of_graph_get_next_endpoint() so far. There is another non intuitive behavior on of_graph_get_next_endpoint(). In case of if I could get A1 pointer for some way, and if I want to handle port@1 things, I would like use it like below /* * "endpoint" is now A1, and handle port1 things here, * but we don't know how many endpoints port1 has. * * Because "endpoint" is non NULL, we can use port1 * as of_graph_get_next_endpoint(port1, xxx) */ do { /* do something for port1 specific things here */ } while (endpoint = of_graph_get_next_endpoint(port1, endpoint)) But it also not worked as I expected. I expect it will be A1 -> A2 -> NULL, but it will be A1 -> A2 -> B, because of_graph_get_next_endpoint() will fetch endpoint beyond the port. It is not useful on generic driver like Generic Sound Card. It uses of_get_next_child() instead for now, but it is not intuitive, and not check node name (= "endpoint"). To handle endpoint more intuitive, create of_graph_get_next_endpoint_raw() of_graph_get_next_endpoint_raw(port1, NULL); // A1 of_graph_get_next_endpoint_raw(port1, A1); // A2 of_graph_get_next_endpoint_raw(port1, A2); // NULL Signed-off-by: Kuninori Morimoto --- drivers/of/property.c | 26 +++++++++++++++++++++++++- include/linux/of_graph.h | 2 ++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/of/property.c b/drivers/of/property.c index 14ffd199c9b1..37dbb1b0e742 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -667,6 +667,30 @@ struct device_node *of_graph_get_next_port(const struct device_node *parent, } EXPORT_SYMBOL(of_graph_get_next_port); +/** + * of_graph_get_next_endpoint_raw() - get next endpoint node + * @port: pointer to the target port node + * @endpoint: current endpoint node, or NULL to get first + * + * Return: An 'endpoint' node pointer with refcount incremented. Refcount + * of the passed @prev node is decremented. + */ +struct device_node *of_graph_get_next_endpoint_raw(const struct device_node *port, + struct device_node *endpoint) +{ + if (!port) + return NULL; + + do { + endpoint = of_get_next_child(port, endpoint); + if (!endpoint) + break; + } while (!of_node_name_eq(endpoint, "endpoint")); + + return endpoint; +} +EXPORT_SYMBOL(of_graph_get_next_endpoint_raw); + /** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node @@ -708,7 +732,7 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, * getting the next child. If the previous endpoint is NULL this * will return the first child. */ - endpoint = of_get_next_child(port, prev); + endpoint = of_graph_get_next_endpoint_raw(port, prev); if (endpoint) { of_node_put(port); return endpoint; diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index fff598640e93..427905a6e8c3 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -57,6 +57,8 @@ int of_graph_get_port_count(const struct device_node *np); 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_next_endpoint_raw(const struct device_node *port, + struct device_node *prev); struct device_node *of_graph_get_next_port(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_endpoint_by_regs(