Re: [PATCH 3/3] clk: lmk04832: Support using PLL1_LD as SPI readback pin

[Liam Beguin <liambeguin@gmail.com>]

On Wed, Aug 02, 2023 at 08:41:00AM +0200, Mike Looijmans wrote:
> The PLL1_PD pin (a.k.a. STATUS_LD1) can be used as SPI readback pin. Make
> this possible.
> 
> Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>

Reviewed-by: Liam Beguin <liambeguin@gmail.com>

> ---
>  drivers/clk/clk-lmk04832.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/clk/clk-lmk04832.c b/drivers/clk/clk-lmk04832.c
> index dd1f0c59ee71..99b271c1278a 100644
> --- a/drivers/clk/clk-lmk04832.c
> +++ b/drivers/clk/clk-lmk04832.c
> @@ -134,6 +134,11 @@
>  /* 0x14b - 0x152 Holdover */
>  
>  /* 0x153 - 0x15f PLL1 Configuration */
> +#define LMK04832_REG_PLL1_LD		0x15f
> +#define LMK04832_BIT_PLL1_LD_MUX		GENMASK(7, 3)
> +#define LMK04832_VAL_PLL1_LD_MUX_SPI_RDBK		0x07
> +#define LMK04832_BIT_PLL1_LD_TYPE		GENMASK(2, 0)
> +#define LMK04832_VAL_PLL1_LD_TYPE_OUT_PP		0x03
>  
>  /* 0x160 - 0x16e PLL2 Configuration */
>  #define LMK04832_REG_PLL2_R_MSB		0x160
> @@ -206,6 +211,7 @@ enum lmk04832_rdbk_type {
>  	RDBK_CLKIN_SEL0,
>  	RDBK_CLKIN_SEL1,
>  	RDBK_RESET,
> +	RDBK_PLL1_LD,
>  };
>  
>  struct lmk_dclk {
> @@ -1346,6 +1352,10 @@ static int lmk04832_set_spi_rdbk(const struct lmk04832 *lmk, const int rdbk_pin)
>  {
>  	int reg;
>  	int ret;
> +	int val = FIELD_PREP(LMK04832_BIT_CLKIN_SEL_MUX,
> +			     LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK) |
> +		  FIELD_PREP(LMK04832_BIT_CLKIN_SEL_TYPE,
> +			     LMK04832_VAL_CLKIN_SEL_TYPE_OUT);
>  
>  	dev_info(lmk->dev, "setting up 4-wire mode\n");
>  	ret = regmap_write(lmk->regmap, LMK04832_REG_RST3W,
> @@ -1363,15 +1373,18 @@ static int lmk04832_set_spi_rdbk(const struct lmk04832 *lmk, const int rdbk_pin)
>  	case RDBK_RESET:
>  		reg = LMK04832_REG_CLKIN_RST;
>  		break;
> +	case RDBK_PLL1_LD:
> +		reg = LMK04832_REG_PLL1_LD;
> +		val = FIELD_PREP(LMK04832_BIT_PLL1_LD_MUX,
> +				 LMK04832_VAL_PLL1_LD_MUX_SPI_RDBK) |
> +		      FIELD_PREP(LMK04832_BIT_PLL1_LD_TYPE,
> +				 LMK04832_VAL_PLL1_LD_TYPE_OUT_PP);
> +		break;
>  	default:
>  		return -EINVAL;
>  	}
>  
> -	return regmap_write(lmk->regmap, reg,
> -			    FIELD_PREP(LMK04832_BIT_CLKIN_SEL_MUX,
> -				       LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK) |
> -			    FIELD_PREP(LMK04832_BIT_CLKIN_SEL_TYPE,
> -				       LMK04832_VAL_CLKIN_SEL_TYPE_OUT));
> +	return regmap_write(lmk->regmap, reg, val);
>  }
>  
>  static int lmk04832_probe(struct spi_device *spi)
> -- 
> 2.17.1
> 
> 
> Met vriendelijke groet / kind regards,
> 
> Mike Looijmans
> System Expert
> 
> 
> TOPIC Embedded Products B.V.
> Materiaalweg 4, 5681 RJ Best
> The Netherlands
> 
> T: +31 (0) 499 33 69 69
> E: mike.looijmans@topicproducts.com
> W: www.topic.nl
> 
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