ASoC: jz4740-i2s: Remove .set_sysclk() & friends

Merge series from Aidan MacDonald <[e-mail]>:

A quick series to get rid of .set_sysclk() from jz4740-i2s.
It wasn't used in practice so this shouldn't be troublesome for anyone,
and fortunately there aren't any backward compatibility concerns.

The actual rationale for removing it, as opposed to fixing the
issues of the current DT bindings and implementation, is provided
in the dt-bindings patch.

Documentation/devicetree/bindings/sound/ingenic,aic.yaml

···
     items:
       - description: AIC clock
       - description: I2S clock
-      - description: EXT clock
-      - description: PLL/2 clock
 
   clock-names:
     items:
       - const: aic
       - const: i2s
-      - const: ext
-      - const: pll half
 
   dmas:
     items:
···
       interrupts = <18>;
 
       clocks = <&cgu JZ4740_CLK_AIC>,
-               <&cgu JZ4740_CLK_I2S>,
-               <&cgu JZ4740_CLK_EXT>,
-               <&cgu JZ4740_CLK_PLL_HALF>;
-      clock-names = "aic", "i2s", "ext", "pll half";
+               <&cgu JZ4740_CLK_I2S>;
+      clock-names = "aic", "i2s";
 
       dmas = <&dmac 25 0xffffffff>, <&dmac 24 0xffffffff>;
       dma-names = "rx", "tx";

sound/soc/jz4740/jz4740-i2s.c

···
 #include <sound/initval.h>
 #include <sound/dmaengine_pcm.h>
 
-#include "jz4740-i2s.h"
-
 #define JZ_REG_AIC_CONF		0x00
 #define JZ_REG_AIC_CTRL		0x04
 #define JZ_REG_AIC_I2S_FMT	0x10
···
 	return 0;
 }
 
-static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
-	unsigned int freq, int dir)
-{
-	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-	struct clk *parent;
-	int ret = 0;
-
-	switch (clk_id) {
-	case JZ4740_I2S_CLKSRC_EXT:
-		parent = clk_get(NULL, "ext");
-		if (IS_ERR(parent))
-			return PTR_ERR(parent);
-		clk_set_parent(i2s->clk_i2s, parent);
-		break;
-	case JZ4740_I2S_CLKSRC_PLL:
-		parent = clk_get(NULL, "pll half");
-		if (IS_ERR(parent))
-			return PTR_ERR(parent);
-		clk_set_parent(i2s->clk_i2s, parent);
-		ret = clk_set_rate(i2s->clk_i2s, freq);
-		break;
-	default:
-		return -EINVAL;
-	}
-	clk_put(parent);
-
-	return ret;
-}
-
 static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
···
 	.trigger = jz4740_i2s_trigger,
 	.hw_params = jz4740_i2s_hw_params,
 	.set_fmt = jz4740_i2s_set_fmt,
-	.set_sysclk = jz4740_i2s_set_sysclk,
 };
 
 #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \

sound/soc/jz4740/jz4740-i2s.h

···
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#ifndef _JZ4740_I2S_H
-#define _JZ4740_I2S_H
-
-/* I2S clock source */
-#define JZ4740_I2S_CLKSRC_EXT 0
-#define JZ4740_I2S_CLKSRC_PLL 1
-
-#endif