clk: mvebu: armada-37xx-periph: fix __iomem casts in structure init

There are a number of casts to "void __iomem *" in the initialsation
of the driver's clk information. Fix this by adding a helper macro
for the cast.

Silences a number of sparse warnings:

drivers/clk/mvebu/armada-37xx-periph.c:254:1: warning: incorrect type in initializer (different address spaces)
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    expected void [noderef] __iomem *reg
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    got void *
drivers/clk/mvebu/armada-37xx-periph.c:254:1: warning: incorrect type in initializer (different address spaces)
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    expected void [noderef] __iomem *reg1
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    got void *
drivers/clk/mvebu/armada-37xx-periph.c:254:1: warning: incorrect type in initializer (different address spaces)
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    expected void [noderef] __iomem *reg2
drivers/clk/mvebu/armada-37xx-periph.c:254:1:    got void *
drivers/clk/mvebu/armada-37xx-periph.c:255:1: warning: incorrect type in initializer (different address spaces)
drivers/clk/mvebu/armada-37xx-periph.c:255:1:    expected void [noderef] __iomem *reg
drivers/clk/mvebu/armada-37xx-periph.c:255:1:    got void *
...

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: bjdooks-ct

drivers/clk/mvebu/armada-37xx-periph.c

@@ -126,9 +126,11 @@ static const struct clk_div_table clk_table2[] = {
 static const struct clk_ops clk_double_div_ops;
 static const struct clk_ops clk_pm_cpu_ops;
 
+#define __reg(__x) ((void __iomem __force *)(__x))
+
 #define PERIPH_GATE(_name, _bit)		\
 struct clk_gate gate_##_name = {		\
-	.reg = (void *)CLK_DIS,			\
+	.reg = __reg(CLK_DIS),			\
 	.bit_idx = _bit,			\
 	.hw.init = &(struct clk_init_data){	\
 		.ops =  &clk_gate_ops,		\
@@ -137,7 +139,7 @@ struct clk_gate gate_##_name = {		\
 
 #define PERIPH_MUX(_name, _shift)		\
 struct clk_mux mux_##_name = {			\
-	.reg = (void *)TBG_SEL,			\
+	.reg = __reg(TBG_SEL),			\
 	.shift = _shift,			\
 	.mask = 3,				\
 	.hw.init = &(struct clk_init_data){	\
@@ -147,8 +149,8 @@ struct clk_mux mux_##_name = {			\
 
 #define PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2)	\
 struct clk_double_div rate_##_name = {		\
-	.reg1 = (void *)_reg1,			\
-	.reg2 = (void *)_reg2,			\
+	.reg1 = __reg(_reg1),			\
+	.reg2 = __reg(_reg2),			\
 	.shift1 = _shift1,			\
 	.shift2 = _shift2,			\
 	.hw.init = &(struct clk_init_data){	\
@@ -158,7 +160,7 @@ struct clk_double_div rate_##_name = {		\
 
 #define PERIPH_DIV(_name, _reg, _shift, _table)	\
 struct clk_divider rate_##_name = {		\
-	.reg = (void *)_reg,			\
+	.reg = __reg(_reg),			\
 	.table = _table,			\
 	.shift = _shift,			\
 	.hw.init = &(struct clk_init_data){	\
@@ -168,10 +170,10 @@ struct clk_divider rate_##_name = {		\
 
 #define PERIPH_PM_CPU(_name, _shift1, _reg, _shift2)	\
 struct clk_pm_cpu muxrate_##_name = {		\
-	.reg_mux = (void *)TBG_SEL,		\
+	.reg_mux = __reg(TBG_SEL),		\
 	.mask_mux = 3,				\
 	.shift_mux = _shift1,			\
-	.reg_div = (void *)_reg,		\
+	.reg_div = __reg(_reg),			\
 	.shift_div = _shift2,			\
 	.hw.init = &(struct clk_init_data){	\
 		.ops =  &clk_pm_cpu_ops,	\