remoteproc: k3: Refactor .detach rproc ops into common driver

The .detach rproc ops implementations in TI K3 R5, DSP and M4
remoteproc drivers are NOPs. Refactor the implementations into
ti_k3_common.c driver as k3_rproc_detach() and register this common
function as .detach ops in R5, DSP and M4 drivers.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
Tested-by: Judith Mendez <jm@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20250513054510.3439842-31-b-padhi@ti.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: 3V3RYONE

drivers/remoteproc/ti_k3_common.c

@@ -308,5 +308,15 @@ EXPORT_SYMBOL_GPL(k3_rproc_stop);
 int k3_rproc_attach(struct rproc *rproc) { return 0; }
 EXPORT_SYMBOL_GPL(k3_rproc_attach);
 
+/*
+ * Detach from a running remote processor (IPC-only mode)
+ *
+ * The rproc detach callback is a NOP. The remote processor is not stopped and
+ * will be left in booted state in IPC-only mode. This callback is invoked only
+ * in IPC-only mode and exists for sanity sake
+ */
+int k3_rproc_detach(struct rproc *rproc) { return 0; }
+EXPORT_SYMBOL_GPL(k3_rproc_detach);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("TI K3 common Remoteproc code");

drivers/remoteproc/ti_k3_common.h

@@ -103,4 +103,5 @@ int k3_rproc_unprepare(struct rproc *rproc);
 int k3_rproc_start(struct rproc *rproc);
 int k3_rproc_stop(struct rproc *rproc);
 int k3_rproc_attach(struct rproc *rproc);
+int k3_rproc_detach(struct rproc *rproc);
 #endif /* REMOTEPROC_TI_K3_COMMON_H */

drivers/remoteproc/ti_k3_dsp_remoteproc.c

@@ -58,15 +58,6 @@ static int k3_dsp_rproc_start(struct rproc *rproc)
 	return 0;
 }
 
-/*
- * Detach from a running DSP remote processor (IPC-only mode)
- *
- * This rproc detach callback is a NOP. The DSP core is not stopped and will be
- * left to continue to run its booted firmware. This callback is invoked only in
- * IPC-only mode and exists for sanity sake.
- */
-static int k3_dsp_rproc_detach(struct rproc *rproc) { return 0; }
-
 /*
  * This function implements the .get_loaded_rsc_table() callback and is used
  * to provide the resource table for a booted DSP in IPC-only mode. The K3 DSP
@@ -162,7 +153,7 @@ static const struct rproc_ops k3_dsp_rproc_ops = {
 	.start			= k3_dsp_rproc_start,
 	.stop			= k3_rproc_stop,
 	.attach			= k3_rproc_attach,
-	.detach			= k3_dsp_rproc_detach,
+	.detach			= k3_rproc_detach,
 	.kick			= k3_rproc_kick,
 	.da_to_va		= k3_dsp_rproc_da_to_va,
 	.get_loaded_rsc_table	= k3_dsp_get_loaded_rsc_table,

drivers/remoteproc/ti_k3_m4_remoteproc.c

@@ -244,25 +244,13 @@ static void k3_m4_release_tsp(void *data)
 	ti_sci_proc_release(tsp);
 }
 
-/*
- * Detach from a running M4 remote processor (IPC-only mode)
- *
- * This rproc detach callback performs the opposite operation to attach
- * callback, the M4 core is not stopped and will be left to continue to
- * run its booted firmware. This callback is invoked only in IPC-only mode.
- */
-static int k3_m4_rproc_detach(struct rproc *rproc)
-{
-	return 0;
-}
-
 static const struct rproc_ops k3_m4_rproc_ops = {
 	.prepare = k3_rproc_prepare,
 	.unprepare = k3_rproc_unprepare,
 	.start = k3_rproc_start,
 	.stop = k3_rproc_stop,
 	.attach = k3_rproc_attach,
-	.detach = k3_m4_rproc_detach,
+	.detach = k3_rproc_detach,
 	.kick = k3_rproc_kick,
 	.da_to_va = k3_m4_rproc_da_to_va,
 	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,

drivers/remoteproc/ti_k3_r5_remoteproc.c

@@ -559,15 +559,6 @@ static int k3_r5_rproc_stop(struct rproc *rproc)
 	return ret;
 }
 
-/*
- * Detach from a running R5F remote processor (IPC-only mode)
- *
- * The R5F detach callback is a NOP. The R5F cores are not stopped and will be
- * left in booted state in IPC-only mode. This callback is invoked only in
- * IPC-only mode and exists for sanity sake.
- */
-static int k3_r5_rproc_detach(struct rproc *rproc) { return 0; }
-
 /*
  * This function implements the .get_loaded_rsc_table() callback and is used
  * to provide the resource table for the booted R5F in IPC-only mode. The K3 R5F
@@ -1049,7 +1040,7 @@ static int k3_r5_rproc_configure_mode(struct k3_rproc *kproc)
 		kproc->rproc->ops->start = NULL;
 		kproc->rproc->ops->stop = NULL;
 		kproc->rproc->ops->attach = k3_rproc_attach;
-		kproc->rproc->ops->detach = k3_r5_rproc_detach;
+		kproc->rproc->ops->detach = k3_rproc_detach;
 		kproc->rproc->ops->get_loaded_rsc_table =
 						k3_r5_get_loaded_rsc_table;
 	} else if (!c_state) {