clk: rs9: fix wrong default value for clock amplitude

According to 9FGV0241, 9FGV0441 & 9FGV0841 datasheets, the default
value for the clock amplitude is 0.8V, while the driver assumes 0.7V.

Additionally, define constants for default values for both clock
amplitude and spread spectrum and use them.

Fixes: 892e0dd ("clk: rs9: Add Renesas 9-series PCIe clock generator driver")
Signed-off-by: Catalin Popescu <catalin.popescu@leica-geosystems.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20240415140348.2887619-1-catalin.popescu@leica-geosystems.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: catalin-popescu

drivers/clk/clk-renesas-pcie.c

@@ -25,10 +25,12 @@
 #define RS9_REG_SS_AMP_0V7			0x1
 #define RS9_REG_SS_AMP_0V8			0x2
 #define RS9_REG_SS_AMP_0V9			0x3
+#define RS9_REG_SS_AMP_DEFAULT			RS9_REG_SS_AMP_0V8
 #define RS9_REG_SS_AMP_MASK			0x3
 #define RS9_REG_SS_SSC_100			0
 #define RS9_REG_SS_SSC_M025			(1 << 3)
 #define RS9_REG_SS_SSC_M050			(3 << 3)
+#define RS9_REG_SS_SSC_DEFAULT			RS9_REG_SS_SSC_100
 #define RS9_REG_SS_SSC_MASK			(3 << 3)
 #define RS9_REG_SS_SSC_LOCK			BIT(5)
 #define RS9_REG_SR				0x2
@@ -205,8 +207,8 @@ static int rs9_get_common_config(struct rs9_driver_data *rs9)
 	int ret;
 
 	/* Set defaults */
-	rs9->pll_amplitude = RS9_REG_SS_AMP_0V7;
-	rs9->pll_ssc = RS9_REG_SS_SSC_100;
+	rs9->pll_amplitude = RS9_REG_SS_AMP_DEFAULT;
+	rs9->pll_ssc = RS9_REG_SS_SSC_DEFAULT;
 
 	/* Output clock amplitude */
 	ret = of_property_read_u32(np, "renesas,out-amplitude-microvolt",
@@ -247,13 +249,13 @@ static void rs9_update_config(struct rs9_driver_data *rs9)
 	int i;
 
 	/* If amplitude is non-default, update it. */
-	if (rs9->pll_amplitude != RS9_REG_SS_AMP_0V7) {
+	if (rs9->pll_amplitude != RS9_REG_SS_AMP_DEFAULT) {
 		regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_AMP_MASK,
 				   rs9->pll_amplitude);
 	}
 
 	/* If SSC is non-default, update it. */
-	if (rs9->pll_ssc != RS9_REG_SS_SSC_100) {
+	if (rs9->pll_ssc != RS9_REG_SS_SSC_DEFAULT) {
 		regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_SSC_MASK,
 				   rs9->pll_ssc);
 	}