ASoC: rockchip: pdm: add default regs

This patch add default regs value for controller.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_pdm.c

@@ -361,11 +361,19 @@ static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
 	}
 }
 
+static const struct reg_default rockchip_pdm_reg_defaults[] = {
+	{0x04, 0x78000017},
+	{0x08, 0x0bb8ea60},
+	{0x18, 0x0000001f},
+};
+
 static const struct regmap_config rockchip_pdm_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 	.max_register = PDM_VERSION,
+	.reg_defaults = rockchip_pdm_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
 	.writeable_reg = rockchip_pdm_wr_reg,
 	.readable_reg = rockchip_pdm_rd_reg,
 	.volatile_reg = rockchip_pdm_volatile_reg,