[RFC PATCH 12/17] sunxi: clock: support D1/R528 PLL6 clock

[Andre Przywara <andre.przywara@arm.com>]

The PLL_PERIPH0 clock changed a bit in the D1/R528/T113s SoCs: there is
new P0 divider at bits [18:16], and the M divider is 1.

Add code to support this version of "PLL6".

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 .../include/asm/arch-sunxi/clock_sun50i_h6.h  |  2 ++
 arch/arm/mach-sunxi/clock_sun50i_h6.c         | 24 +++++++++++++------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
index 9895c2c220e..8471e11aa02 100644
--- a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
+++ b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
@@ -249,6 +249,8 @@ struct sunxi_ccm_reg {
 #define CCM_PLL6_CTRL_EN		BIT(31)
 #define CCM_PLL6_LOCK_EN		BIT(29)
 #define CCM_PLL6_LOCK			BIT(28)
+#define CCM_PLL6_CTRL_P0_SHIFT		16
+#define CCM_PLL6_CTRL_P0_MASK		(0x7 << CCM_PLL6_CTRL_P0_SHIFT)
 #define CCM_PLL6_CTRL_N_SHIFT		8
 #define CCM_PLL6_CTRL_N_MASK		(0xff << CCM_PLL6_CTRL_N_SHIFT)
 #define CCM_PLL6_CTRL_DIV1_SHIFT	0
diff --git a/arch/arm/mach-sunxi/clock_sun50i_h6.c b/arch/arm/mach-sunxi/clock_sun50i_h6.c
index 90110eab101..607efe6a9c1 100644
--- a/arch/arm/mach-sunxi/clock_sun50i_h6.c
+++ b/arch/arm/mach-sunxi/clock_sun50i_h6.c
@@ -107,16 +107,26 @@ unsigned int clock_get_pll6(void)
 {
 	struct sunxi_ccm_reg *const ccm =
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
-	int m = IS_ENABLED(CONFIG_MACH_SUN50I_H6) ? 4 : 2;
-
 	uint32_t rval = readl(&ccm->pll6_cfg);
 	int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
-	int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
-			CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
 	int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>
-			CCM_PLL6_CTRL_DIV2_SHIFT) + 1;
-	/* The register defines PLL6-2X or PLL6-4X, not plain PLL6 */
-	return 24000000 / m * n / div1 / div2;
+		    CCM_PLL6_CTRL_DIV2_SHIFT) + 1;
+	int div1, m;
+
+	if (IS_ENABLED(CONFIG_SUNXI_GEN_NCAT2)) {
+		div1 = ((rval & CCM_PLL6_CTRL_P0_MASK) >>
+			CCM_PLL6_CTRL_P0_SHIFT) + 1;
+		m = 1;
+	} else {
+		div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
+			CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
+		if (IS_ENABLED(CONFIG_MACH_SUN50I_H6))
+			m = 4;
+		else
+			m = 2;
+	}
+
+	return 24000000U * n / m / div1 / div2;
 }
 
 int clock_twi_onoff(int port, int state)
-- 
2.35.5