can: c_can: Use syscon_regmap_lookup_by_phandle_args

Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
syscon_regmap_lookup_by_phandle() combined with getting the syscon
argument.  Except simpler code this annotates within one line that given
phandle has arguments, so grepping for code would be easier.

There is also no real benefit in printing errors on missing syscon
argument, because this is done just too late: runtime check on
static/build-time data.  Dtschema and Devicetree bindings offer the
static/build-time check for this already.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20250212-syscon-phandle-args-can-v2-4-ac9a1253396b@linaro.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 1acceb097c17fb7c0e2095a43d926d9cf802ebef..19c86b94a40e4f5c3db3c2da67b64da1310584b8 100644 (file)
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -317,30 +317,21 @@ static int c_can_plat_probe(struct platform_device *pdev)
                 * platforms. Only supported with DT boot.
                 */
                if (np && of_property_present(np, "syscon-raminit")) {
+                       unsigned int args[2];
                        u32 id;
                        struct c_can_raminit *raminit = &priv->raminit_sys;
 
                        ret = -EINVAL;
-                       raminit->syscon = syscon_regmap_lookup_by_phandle(np,
-                                                                         "syscon-raminit");
+                       raminit->syscon = syscon_regmap_lookup_by_phandle_args(np,
+                                                                              "syscon-raminit",
+                                                                              2, args);
                        if (IS_ERR(raminit->syscon)) {
                                ret = PTR_ERR(raminit->syscon);
                                goto exit_free_device;
                        }
 
-                       if (of_property_read_u32_index(np, "syscon-raminit", 1,
-                                                      &raminit->reg)) {
-                               dev_err(&pdev->dev,
-                                       "couldn't get the RAMINIT reg. offset!\n");
-                               goto exit_free_device;
-                       }
-
-                       if (of_property_read_u32_index(np, "syscon-raminit", 2,
-                                                      &id)) {
-                               dev_err(&pdev->dev,
-                                       "couldn't get the CAN instance ID\n");
-                               goto exit_free_device;
-                       }
+                       raminit->reg = args[0];
+                       id = args[1];
 
                        if (id >= drvdata->raminit_num) {
                                dev_err(&pdev->dev,