linux-kernel - [PATCH v5 6/6] remoteproc: pru: add support for configuring GPMUX based on client setup

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Date:   Tue, 7 Jun 2022 10:26:50 +0530
From:   Puranjay Mohan <p-mohan@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <bjorn.andersson@...aro.org>, <mathieu.poirier@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <nm@...com>, <ssantosh@...nel.org>, <s-anna@...com>,
        <p-mohan@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <rogerq@...nel.org>, <grygorii.strashko@...com>, <vigneshr@...com>,
        <kishon@...com>, <robh@...nel.org>
Subject: [PATCH v5 6/6] remoteproc: pru: add support for configuring GPMUX based on client setup

From: Tero Kristo <t-kristo@...com>

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@...com>
[s-anna@...com: simplify the pru id usage]
Signed-off-by: Suman Anna <s-anna@...com>
Signed-off-by: Puranjay Mohan <p-mohan@...com>
---
V4->v5
* This patch was included in v4 and had some checkpatch errors that have
  been resolved in v5
---
 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..f2c6c55f0f20 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