ASoC: codecs: tx-macro: Drop unimplemented DMIC clock divider

Downstream driver configures DMIC clock rate through the divider
register but only parts of this code ended up in the upstream driver: we
always write the same value 0, so DIV2.  Same default value is used also
for the AMIC rate control.

Let's make it obvious and drop unneeded parts of the code.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240202154134.66967-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/lpass-tx-macro.c

@@ -38,6 +38,8 @@
 #define CDC_TX_TOP_CSR_I2S_RESET	(0x00AC)
 #define CDC_TX_TOP_CSR_SWR_DMICn_CTL(n)	(0x00C0 + n * 0x4)
 #define CDC_TX_TOP_CSR_SWR_DMIC0_CTL	(0x00C0)
+/* Default divider for AMIC and DMIC clock: DIV2 */
+#define CDC_TX_SWR_MIC_CLK_DEFAULT	0
 #define CDC_TX_SWR_DMIC_CLK_SEL_MASK	GENMASK(3, 1)
 #define CDC_TX_TOP_CSR_SWR_DMIC1_CTL	(0x00C4)
 #define CDC_TX_TOP_CSR_SWR_DMIC2_CTL	(0x00C8)
@@ -270,7 +272,6 @@ struct tx_macro {
 	struct clk_hw hw;
 	bool dec_active[NUM_DECIMATORS];
 	int tx_mclk_users;
-	u16 dmic_clk_div;
 	bool bcs_enable;
 	int dec_mode[NUM_DECIMATORS];
 	struct lpass_macro *pds;
@@ -743,7 +744,6 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
 	unsigned int val, dmic;
 	u16 mic_sel_reg;
 	u16 dmic_clk_reg;
-	struct tx_macro *tx = snd_soc_component_get_drvdata(component);
 
 	val = ucontrol->value.enumerated.item[0];
 	if (val >= e->items)
@@ -793,7 +793,7 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
 			dmic_clk_reg = CDC_TX_TOP_CSR_SWR_DMICn_CTL(dmic);
 			snd_soc_component_write_field(component, dmic_clk_reg,
 						CDC_TX_SWR_DMIC_CLK_SEL_MASK,
-						tx->dmic_clk_div);
+						CDC_TX_SWR_MIC_CLK_DEFAULT);
 		}
 	}
 
@@ -882,7 +882,7 @@ static int tx_macro_enable_dec(struct snd_soc_dapm_widget *w,
 
 				snd_soc_component_write_field(component, dmic_clk_reg,
 							CDC_TX_SWR_DMIC_CLK_SEL_MASK,
-							tx->dmic_clk_div);
+							CDC_TX_SWR_MIC_CLK_DEFAULT);
 			}
 		}
 		snd_soc_component_write_field(component, dec_cfg_reg,