[PATCH] ASoC: fsl: lpc3xxx-i2s: Include bitfield.h for FIELD_PREP

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bitfield.h is not explicitly included but it is required for FIELD_PREP
to be expanded by the preprocessor. If it is not implicitly included,
there will be a compiler error (as seen with ARCH=hexagon allmodconfig):

  sound/soc/fsl/lpc3xxx-i2s.c:169:10: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    169 |                 tmp |= LPC3XXX_I2S_WW8 | LPC3XXX_I2S_WS_HP(LPC3XXX_I2S_WW8_HP);
        |                        ^
  sound/soc/fsl/lpc3xxx-i2s.h:42:30: note: expanded from macro 'LPC3XXX_I2S_WW8'
     42 | #define LPC3XXX_I2S_WW8      FIELD_PREP(0x3, 0) /* Word width is 8bit */
        |                              ^
  sound/soc/fsl/lpc3xxx-i2s.c:205:34: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    205 |                              LPC3XXX_I2S_DMA1_TX_EN | LPC3XXX_I2S_DMA0_TX_DEPTH(4));
        |                                                       ^
  sound/soc/fsl/lpc3xxx-i2s.h:65:38: note: expanded from macro 'LPC3XXX_I2S_DMA0_TX_DEPTH'
     65 | #define LPC3XXX_I2S_DMA0_TX_DEPTH(s) FIELD_PREP(0xF0000, s) /* Set the DMA1 TX Request level */
        |                                      ^
  sound/soc/fsl/lpc3xxx-i2s.c:210:34: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    210 |                              LPC3XXX_I2S_DMA0_RX_EN | LPC3XXX_I2S_DMA1_RX_DEPTH(4));
        |                                                       ^
  sound/soc/fsl/lpc3xxx-i2s.h:70:38: note: expanded from macro 'LPC3XXX_I2S_DMA1_RX_DEPTH'
     70 | #define LPC3XXX_I2S_DMA1_RX_DEPTH(s) FIELD_PREP(0x700, s) /* Set the DMA1 RX Request level */
        |                                      ^

Include bitfield.h explicitly, so that FIELD_PREP is always expanded,
clearing up the compiler error.

Fixes: 0959de657a10 ("ASoC: fsl: Add i2s and pcm drivers for LPC32xx CPUs")
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
---
 sound/soc/fsl/lpc3xxx-i2s.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/fsl/lpc3xxx-i2s.h b/sound/soc/fsl/lpc3xxx-i2s.h
index eec755448478..b6657853017a 100644
--- a/sound/soc/fsl/lpc3xxx-i2s.h
+++ b/sound/soc/fsl/lpc3xxx-i2s.h
@@ -9,6 +9,7 @@
 #ifndef __SOUND_SOC_LPC3XXX_I2S_H
 #define __SOUND_SOC_LPC3XXX_I2S_H
 
+#include <linux/bitfield.h>
 #include <linux/types.h>
 #include <linux/regmap.h>
 

---
base-commit: 55f0a1fa6ea4e339c797e9a3292ca0caa4ab3885
change-id: 20240701-lpc32xx-asoc-fix-include-for-field_prep-140db845a209

Best regards,
-- 
Nathan Chancellor <nathan@xxxxxxxxxx>




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