With the prcm in sun6i (and some later SoCs) some mod0 clocks are instantiated
through the mfd framework, and as such do not work with of_clk_declare, since
they do not have registers assigned to them yet at of_clk_declare init time.

Silence the error on not finding registers in the of_clk_declare mod0 clk
setup method, and also register mod0-clk support as a platform driver to work
properly with mfd instantiated mod0 clocks.

Signed-off-by: Hans de Goede <redacted>
---
 drivers/clk/sunxi/clk-mod0.c | 41 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/sunxi/clk-mod0.c b/drivers/clk/sunxi/clk-mod0.c
index 658d74f..7ddab6f 100644
--- a/drivers/clk/sunxi/clk-mod0.c
+++ b/drivers/clk/sunxi/clk-mod0.c

@@ -17,6 +17,7 @@
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
 #include <linux/of_address.h>
+#include <linux/platform_device.h>
 
 #include "clk-factors.h"
 

@@ -67,7 +68,7 @@ static struct clk_factors_config sun4i_a10_mod0_config = {
 	.pwidth = 2,
 };
 
-static const struct factors_data sun4i_a10_mod0_data __initconst = {
+static const struct factors_data sun4i_a10_mod0_data = {
 	.enable = 31,
 	.mux = 24,
 	.muxmask = BIT(1) | BIT(0),

@@ -82,17 +83,47 @@ static void __init sun4i_a10_mod0_setup(struct device_node *node)
 	void __iomem *reg;
 
 	reg = of_iomap(node, 0);
-	if (!reg) {
-		pr_err("Could not get registers for mod0-clk: %s\n",
-		       node->name);
+	if (!reg)
 		return;
-	}