clk: renesas: r9a06g032: Probe possible children

The clock controller device on r9a06g032 takes all the memory range that
is described as being a system controller. This range contains many
different (unrelated?) registers besides the ones belonging to the clock
controller, that can necessitate to be accessed from other peripherals.

For instance, the dmamux registers are there. The dmamux "device" will
be described as a child node of the clock/system controller node, which
means we need the top device driver (the clock controller driver in this
case) to populate its children manually. In case of error when
populating the children, we do not fail the probe on purpose to keep the
clk driver up and running.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220427095653.91804-7-miquel.raynal@bootlin.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/clk/renesas/r9a06g032-clocks.c

@@ -16,6 +16,7 @@
 #include <linux/math64.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_clock.h>
 #include <linux/pm_domain.h>
@@ -996,6 +997,10 @@ static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
 
 	sysctrl_priv = clocks;
 
+	error = of_platform_populate(np, NULL, NULL, dev);
+	if (error)
+		dev_err(dev, "Failed to populate children (%d)\n", error);
+
 	return 0;
 }