[PATCH] ASoC: fsl_mqs: Support accessing registers by scmi interface

[Shengjiu Wang]

On i.MX95, the MQS module in Always-on (AON) domain only can
be accessed by System Controller Management Interface (SCMI)
MISC Protocol. So define a specific regmap_config for the case.

Signed-off-by: Shengjiu Wang <shengjiu.w...@nxp.com>
---
 sound/soc/fsl/fsl_mqs.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/sound/soc/fsl/fsl_mqs.c b/sound/soc/fsl/fsl_mqs.c
index 145f9ca15e43..0513e9e8402e 100644
--- a/sound/soc/fsl/fsl_mqs.c
+++ b/sound/soc/fsl/fsl_mqs.c
@@ -6,6 +6,7 @@
 // Copyright 2019 NXP
 
 #include <linux/clk.h>
+#include <linux/firmware/imx/sm.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/mfd/syscon.h>
@@ -74,6 +75,29 @@ struct fsl_mqs {
 #define FSL_MQS_RATES  (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
 #define FSL_MQS_FORMATS        SNDRV_PCM_FMTBIT_S16_LE
 
+static int fsl_mqs_sm_read(void *context, unsigned int reg, unsigned int *val)
+{
+       struct fsl_mqs *mqs_priv = context;
+       int num = 1;
+
+       if (IS_ENABLED(CONFIG_IMX_SCMI_MISC_DRV) &&
+           mqs_priv->soc->ctrl_off == reg)
+               return scmi_imx_misc_ctrl_get(SCMI_IMX_CTRL_MQS1_SETTINGS, 
&num, val);
+
+       return -EINVAL;
+};
+
+static int fsl_mqs_sm_write(void *context, unsigned int reg, unsigned int val)
+{
+       struct fsl_mqs *mqs_priv = context;
+
+       if (IS_ENABLED(CONFIG_IMX_SCMI_MISC_DRV) &&
+           mqs_priv->soc->ctrl_off == reg)
+               return scmi_imx_misc_ctrl_set(SCMI_IMX_CTRL_MQS1_SETTINGS, val);
+
+       return -EINVAL;
+};
+
 static int fsl_mqs_hw_params(struct snd_pcm_substream *substream,
                             struct snd_pcm_hw_params *params,
                             struct snd_soc_dai *dai)
@@ -188,6 +212,13 @@ static const struct regmap_config fsl_mqs_regmap_config = {
        .cache_type = REGCACHE_NONE,
 };
 
+static const struct regmap_config fsl_mqs_sm_regmap = {
+       .reg_bits = 32,
+       .val_bits = 32,
+       .reg_read = fsl_mqs_sm_read,
+       .reg_write = fsl_mqs_sm_write,
+};
+
 static int fsl_mqs_probe(struct platform_device *pdev)
 {
        struct device_node *np = pdev->dev.of_node;
@@ -219,6 +250,16 @@ static int fsl_mqs_probe(struct platform_device *pdev)
                        dev_err(&pdev->dev, "failed to get gpr regmap\n");
                        return PTR_ERR(mqs_priv->regmap);
                }
+       } else if (mqs_priv->soc->type == TYPE_REG_SM) {
+               mqs_priv->regmap = devm_regmap_init(&pdev->dev,
+                                                   NULL,
+                                                   mqs_priv,
+                                                   &fsl_mqs_sm_regmap);
+               if (IS_ERR(mqs_priv->regmap)) {
+                       dev_err(&pdev->dev, "failed to init regmap: %ld\n",
+                               PTR_ERR(mqs_priv->regmap));
+                       return PTR_ERR(mqs_priv->regmap);
+               }
        } else {
                regs = devm_platform_ioremap_resource(pdev, 0);
                if (IS_ERR(regs))
-- 
2.34.1