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

From: MD Danish Anwar
Date: Wed Aug 02 2023 - 02:50:30 EST


From: Tero Kristo <t-kristo@xxxxxx>

The GPMUX config value for a PRU device can now be configured by client
by specifying it in the device node ti,pruss-gp-mux-sel.

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
Signed-off-by: Suman Anna <s-anna@xxxxxx>
Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
---
drivers/remoteproc/pru_rproc.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 5b2dc75836fc..327f0c7ee3d6 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -110,6 +110,7 @@ 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;
@@ -128,6 +129,7 @@ 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)
@@ -229,6 +231,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
struct device *dev;
const char *fw_name;
int ret;
+ u32 mux;

rproc = __pru_rproc_get(np, index);
if (IS_ERR(rproc))
@@ -253,6 +256,23 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
if (pru_id)
*pru_id = pru->id;

+ 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;
+ }
+
+ /* An error here is acceptable for backward compatibility */
+ 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;
+ }
+ }
+
ret = of_property_read_string_index(np, "firmware-name", index,
&fw_name);
if (!ret) {
@@ -291,6 +311,8 @@ 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);
--
2.34.1