clk: rs9: Fix suspend/resume

Disabling the cache in commit 2ff4ba9e37 ("clk: rs9: Fix I2C accessors")
without removing cache synchronization in resume path results in a
kernel panic as map->cache_ops is unset, due to REGCACHE_NONE.
Enable flat cache again to support resume again. num_reg_defaults_raw
is necessary to read the cache defaults from hardware. Some registers
are strapped in hardware and cannot be provided in software.

Fixes: 2ff4ba9e37 ("clk: rs9: Fix I2C accessors")
Signed-off-by: Alexander Stein <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

drivers/clk/clk-renesas-pcie.c

@@ -143,8 +143,9 @@ static int rs9_regmap_i2c_read(void *context,
 static const struct regmap_config rs9_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
-	.cache_type = REGCACHE_NONE,
+	.cache_type = REGCACHE_FLAT,
 	.max_register = RS9_REG_BCP,
+	.num_reg_defaults_raw = 0x8,
 	.rd_table = &rs9_readable_table,
 	.wr_table = &rs9_writeable_table,
 	.reg_write = rs9_regmap_i2c_write,