Commit 6aa8dc69 authored by Mike Looijmans's avatar Mike Looijmans Committed by Stephen Boyd
Browse files

clk: lmk04832: Support using PLL1_LD as SPI readback pin 



The PLL1_PD pin (a.k.a. STATUS_LD1) can be used as SPI readback pin. Make
this possible.

Signed-off-by: default avatarMike Looijmans <mike.looijmans@topic.nl>
Link: https://lore.kernel.org/r/20230802064100.15793-3-mike.looijmans@topic.nl


Reviewed-by: default avatarLiam Beguin <liambeguin@gmail.com>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent e63227c8

drivers/clk/clk-lmk04832.c

+18 −5
Original line number Diff line number Diff line
@@ -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)