[PATCH v4 6/6] remoteproc: pru: add support for configuring GPMUX based on client setup

[Puranjay Mohan <p-mohan@xxxxxx>]

From: Tero Kristo <t-kristo@xxxxxx>

Client device node property ti,pruss-gp-mux-sel can now be used to
configure the GPMUX config value for PRU.

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
[s-anna@xxxxxx: simplify the pru id usage]
Signed-off-by: Suman Anna <s-anna@xxxxxx>
Signed-off-by: Puranjay Mohan <p-mohan@xxxxxx>
---
 drivers/remoteproc/pru_rproc.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 2977eb50631b..b532069fe259 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -123,6 +123,7 @@ struct pru_private_data {
  * @dbg_single_step: debug state variable to set PRU into single step mode
  * @dbg_continuous: debug state variable to restore PRU execution mode
  * @evt_count: number of mapped events
+ * @gpmux_save: saved value for gpmux config
  */
 struct pru_rproc {
 	int id;
@@ -141,6 +142,7 @@ struct pru_rproc {
 	u32 dbg_single_step;
 	u32 dbg_continuous;
 	u8 evt_count;
+	u8 gpmux_save;
 };
 
 static inline u32 pru_control_read_reg(struct pru_rproc *pru, unsigned int reg)
@@ -250,6 +252,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
 	struct device *dev;
 	const char *fw_name;
 	int ret;
+	u32 mux;
 
 	try_module_get(THIS_MODULE);
 
@@ -273,6 +276,22 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
 
 	mutex_unlock(&pru->lock);
 
+	ret = pruss_cfg_get_gpmux(pru->pruss, pru->id, &pru->gpmux_save);
+        if (ret) {
+                dev_err(dev, "failed to get cfg gpmux: %d\n", ret);
+                goto err;
+        }
+
+        ret = of_property_read_u32_index(np, "ti,pruss-gp-mux-sel", index,
+                                         &mux);
+        if (!ret) {
+                ret = pruss_cfg_set_gpmux(pru->pruss, pru->id, mux);
+                if (ret) {
+                        dev_err(dev, "failed to set cfg gpmux: %d\n", ret);
+                        goto err;
+                }
+        }
+
 	if (pru_id)
 		*pru_id = pru->id;
 
@@ -310,6 +329,7 @@ void pru_rproc_put(struct rproc *rproc)
 
 	pru = rproc->priv;
 
+	pruss_cfg_set_gpmux(pru->pruss, pru->id, pru->gpmux_save);
 	pru_rproc_set_firmware(rproc, NULL);
 
 	mutex_lock(&pru->lock);
-- 
2.17.1