remoteproc: imx_dsp_rproc: Simplify IMX_RPROC_MMIO switch case

Introduce imx_dsp_rproc_mmio_{start, stop, detect_mode}() helper functions
for i.MX variants using IMX_RPROC_MMIO to manage remote processors.

Allows the removal of the IMX_RPROC_MMIO switch-case blocks from
imx_dsp_rproc_[start,stop,detect_mode](), resulting in cleaner and more
maintainable code.

No functional changes.

Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Tested-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20251119-imx-dsp-2025-11-19-v4-8-adafd342d07b@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

2 files changed, 40 insertions, 23 deletions

diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
index f28d25cab3f1..71776816c350 100644
--- a/drivers/remoteproc/imx_dsp_rproc.c
+++ b/drivers/remoteproc/imx_dsp_rproc.c
@@ -338,6 +338,14 @@ static int imx_dsp_rproc_handle_rsc(struct rproc *rproc, u32 rsc_type,
 	return RSC_HANDLED;
 }
 
+static int imx_dsp_rproc_mmio_start(struct rproc *rproc)
+{
+	struct imx_dsp_rproc *priv = rproc->priv;
+	const struct imx_rproc_dcfg *dcfg = priv->dsp_dcfg->dcfg;
+
+	return regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask, dcfg->src_start);
+}
+
 /*
  * Start function for rproc_ops
  *
@@ -360,12 +368,6 @@ static int imx_dsp_rproc_start(struct rproc *rproc)
 	}
 
 	switch (dcfg->method) {
-	case IMX_RPROC_MMIO:
-		ret = regmap_update_bits(priv->regmap,
-					 dcfg->src_reg,
-					 dcfg->src_mask,
-					 dcfg->src_start);
-		break;
 	case IMX_RPROC_SCU_API:
 		ret = imx_sc_pm_cpu_start(priv->ipc_handle,
 					  IMX_SC_R_DSP,
@@ -388,6 +390,14 @@ start_ret:
 	return ret;
 }
 
+static int imx_dsp_rproc_mmio_stop(struct rproc *rproc)
+{
+	struct imx_dsp_rproc *priv = rproc->priv;
+	const struct imx_rproc_dcfg *dcfg = priv->dsp_dcfg->dcfg;
+
+	return regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask, dcfg->src_stop);
+}
+
 /*
  * Stop function for rproc_ops
  * It clears the REMOTE_IS_READY flags
@@ -411,10 +421,6 @@ static int imx_dsp_rproc_stop(struct rproc *rproc)
 	}
 
 	switch (dcfg->method) {
-	case IMX_RPROC_MMIO:
-		ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
-					 dcfg->src_stop);
-		break;
 	case IMX_RPROC_SCU_API:
 		ret = imx_sc_pm_cpu_start(priv->ipc_handle,
 					  IMX_SC_R_DSP,
@@ -1032,6 +1038,23 @@ static int imx_dsp_attach_pm_domains(struct imx_dsp_rproc *priv)
 	return devm_pm_domain_attach_list(dev, NULL, &priv->pd_list);
 }
 
+static int imx_dsp_rproc_mmio_detect_mode(struct rproc *rproc)
+{
+	struct imx_dsp_rproc *priv = rproc->priv;
+	struct device *dev = rproc->dev.parent;
+	struct regmap *regmap;
+
+	regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,dsp-ctrl");
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to find syscon\n");
+		return PTR_ERR(regmap);
+	}
+
+	priv->regmap = regmap;
+
+	return 0;
+}
+
 /**
  * imx_dsp_rproc_detect_mode() - detect DSP control mode
  * @priv: private data pointer
@@ -1049,7 +1072,6 @@ static int imx_dsp_rproc_detect_mode(struct imx_dsp_rproc *priv)
 	const struct imx_dsp_rproc_dcfg *dsp_dcfg = priv->dsp_dcfg;
 	const struct imx_rproc_dcfg *dcfg = dsp_dcfg->dcfg;
 	struct device *dev = priv->rproc->dev.parent;
-	struct regmap *regmap;
 	int ret = 0;
 
 	if (dcfg->ops && dcfg->ops->detect_mode)
@@ -1061,15 +1083,6 @@ static int imx_dsp_rproc_detect_mode(struct imx_dsp_rproc *priv)
 		if (ret)
 			return ret;
 		break;
-	case IMX_RPROC_MMIO:
-		regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,dsp-ctrl");
-		if (IS_ERR(regmap)) {
-			dev_err(dev, "failed to find syscon\n");
-			return PTR_ERR(regmap);
-		}
-
-		priv->regmap = regmap;
-		break;
 	case IMX_RPROC_RESET_CONTROLLER:
 		priv->run_stall = devm_reset_control_get_exclusive(dev, "runstall");
 		if (IS_ERR(priv->run_stall)) {
@@ -1301,6 +1314,12 @@ static const struct dev_pm_ops imx_dsp_rproc_pm_ops = {
 	RUNTIME_PM_OPS(imx_dsp_runtime_suspend, imx_dsp_runtime_resume, NULL)
 };
 
+static const struct imx_rproc_plat_ops imx_dsp_rproc_ops_mmio = {
+	.start		= imx_dsp_rproc_mmio_start,
+	.stop		= imx_dsp_rproc_mmio_stop,
+	.detect_mode	= imx_dsp_rproc_mmio_detect_mode,
+};
+
 /* Specific configuration for i.MX8MP */
 static const struct imx_rproc_dcfg dsp_rproc_cfg_imx8mp = {
 	.att		= imx_dsp_rproc_att_imx8mp,
@@ -1321,7 +1340,7 @@ static const struct imx_rproc_dcfg dsp_rproc_cfg_imx8ulp = {
 	.src_stop	= IMX8ULP_SYSCTRL0_DSP_STALL,
 	.att		= imx_dsp_rproc_att_imx8ulp,
 	.att_size	= ARRAY_SIZE(imx_dsp_rproc_att_imx8ulp),
-	.method		= IMX_RPROC_MMIO,
+	.ops		= &imx_dsp_rproc_ops_mmio,
 };
 
 static const struct imx_dsp_rproc_dcfg imx_dsp_rproc_cfg_imx8ulp = {
diff --git a/drivers/remoteproc/imx_rproc.h b/drivers/remoteproc/imx_rproc.h
index aeed08bdfb56..912827c39c0d 100644
--- a/drivers/remoteproc/imx_rproc.h
+++ b/drivers/remoteproc/imx_rproc.h
@@ -18,8 +18,6 @@ struct imx_rproc_att {
 /* Remote core start/stop method */
 enum imx_rproc_method {
 	IMX_RPROC_NONE,
-	/* Through syscon regmap */
-	IMX_RPROC_MMIO,
 	/* Through ARM SMCCC */
 	IMX_RPROC_SMC,
 	/* Through System Control Unit API */