ASoC: amd: acp: declare and add prefix to 'bt_uart_enable' symbol

Sparse reports the following warning:

sound/soc/amd/acp-pcm-dma.c:39:6: error: symbol 'bt_uart_enable' was
not declared. Should it be static?

It's not very good practice to export such symbols that can easily
conflict, add the acp_ prefix and add declaration in header file.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210907184216.33067-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/acp-da7219-max98357a.c

@@ -33,7 +33,7 @@ static struct clk *da7219_dai_wclk;
 static struct clk *da7219_dai_bclk;
 static struct clk *rt5682_dai_wclk;
 static struct clk *rt5682_dai_bclk;
-extern bool bt_uart_enable;
+
 void *acp_soc_is_rltk_max(struct device *dev);
 
 static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
@@ -760,8 +760,8 @@ static int cz_probe(struct platform_device *pdev)
 				"devm_snd_soc_register_card(%s) failed\n",
 				card->name);
 	}
-	bt_uart_enable = !device_property_read_bool(&pdev->dev,
-						    "bt-pad-enable");
+	acp_bt_uart_enable = !device_property_read_bool(&pdev->dev,
+							"bt-pad-enable");
 	return 0;
 }
 

sound/soc/amd/acp-pcm-dma.c

@@ -36,8 +36,8 @@
 #define ST_MIN_BUFFER ST_MAX_BUFFER
 
 #define DRV_NAME "acp_audio_dma"
-bool bt_uart_enable = true;
-EXPORT_SYMBOL(bt_uart_enable);
+bool acp_bt_uart_enable = true;
+EXPORT_SYMBOL(acp_bt_uart_enable);
 
 static const struct snd_pcm_hardware acp_pcm_hardware_playback = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED |
@@ -596,7 +596,7 @@ static int acp_init(void __iomem *acp_mmio, u32 asic_type)
 	acp_reg_write(val, acp_mmio, mmACP_SOFT_RESET);
 
 	/* For BT instance change pins from UART to BT */
-	if (!bt_uart_enable) {
+	if (!acp_bt_uart_enable) {
 		val = acp_reg_read(acp_mmio, mmACP_BT_UART_PAD_SEL);
 		val |= ACP_BT_UART_PAD_SELECT_MASK;
 		acp_reg_write(val, acp_mmio, mmACP_BT_UART_PAD_SEL);

sound/soc/amd/acp.h

@@ -204,4 +204,6 @@ typedef struct acp_dma_dscr_transfer {
 	u32 reserved;
 } acp_dma_dscr_transfer_t;
 
+extern bool acp_bt_uart_enable;
+
 #endif /*__ACP_HW_H */