[PATCH 04/10] remoteproc: imx_rproc: make syscon optional

[Peng Fan]

Make syscon optional, since i.MX8QM/QXP/7ULP not have SRC to control M4.
But currently i.MX8QM/QXP/7ULP not added, so still check regmap
when start/stop to avoid unhappy things.

Reviewed-by: Richard Zhu <hongxing....@nxp.com>
Signed-off-by: Peng Fan <peng....@nxp.com>
---
 drivers/remoteproc/imx_rproc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 82594a800a1b..4fad5c0b1c05 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -162,6 +162,9 @@ static int imx_rproc_start(struct rproc *rproc)
        struct device *dev = priv->dev;
        int ret;
 
+       if (!priv->regmap)
+               return -EOPNOTSUPP;
+
        ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
                                 dcfg->src_mask, dcfg->src_start);
        if (ret)
@@ -177,6 +180,9 @@ static int imx_rproc_stop(struct rproc *rproc)
        struct device *dev = priv->dev;
        int ret;
 
+       if (!priv->regmap)
+               return -EOPNOTSUPP;
+
        ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
                                 dcfg->src_mask, dcfg->src_stop);
        if (ret)
@@ -325,9 +331,10 @@ static int imx_rproc_probe(struct platform_device *pdev)
        regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
        if (IS_ERR(regmap)) {
                dev_err(dev, "failed to find syscon\n");
-               return PTR_ERR(regmap);
+               regmap = NULL;
+       } else {
+               regmap_attach_dev(dev, regmap, &config);
        }
-       regmap_attach_dev(dev, regmap, &config);
 
        /* set some other name then imx */
        rproc = rproc_alloc(dev, "imx-rproc", &imx_rproc_ops,
-- 
2.16.4