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: Mike Looijmans <mike.looijmans@topic.nl>
Link: https://lore.kernel.org/r/20230802064100.15793-3-mike.looijmans@topic.nl
Reviewed-by: Liam Beguin <liambeguin@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk-lmk04832.c b/drivers/clk/clk-lmk04832.c
index dd1f0c59ee71ac01175e1c85bc8f7fba05c3105e..99b271c1278a9e09d27dda76dbe5f81466eea37b 100644 (file)
--- 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)