--- a/drivers/clk/clk-oxnas.c
+++ b/drivers/clk/clk-oxnas.c
@@ -16,19 +16,42 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/clk.h>
+#include <linux/clkdev.h>
 #include <linux/clk-provider.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/stringify.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
+#include <linux/reset.h>
 
 #include <dt-bindings/clock/oxsemi,ox810se.h>
 #include <dt-bindings/clock/oxsemi,ox820.h>
 
+#define REF300_DIV_INT_SHIFT		8
+#define REF300_DIV_FRAC_SHIFT		0
+#define REF300_DIV_INT(val)		((val) << REF300_DIV_INT_SHIFT)
+#define REF300_DIV_FRAC(val)		((val) << REF300_DIV_FRAC_SHIFT)
+
+#define PLLB_BYPASS			1
+#define PLLB_ENSAT			3
+#define PLLB_OUTDIV			4
+#define PLLB_REFDIV			8
+#define PLLB_DIV_INT_SHIFT		8
+#define PLLB_DIV_FRAC_SHIFT		0
+#define PLLB_DIV_INT(val)		((val) << PLLB_DIV_INT_SHIFT)
+#define PLLB_DIV_FRAC(val)		((val) << PLLB_DIV_FRAC_SHIFT)
+
+#define PLLA_REFDIV_MASK		0x3F
+#define PLLA_REFDIV_SHIFT		8
+#define PLLA_OUTDIV_MASK		0x7
+#define PLLA_OUTDIV_SHIFT		4
+
 /* Standard regmap gate clocks */
 struct clk_oxnas_gate {
 	struct clk_hw hw;
@@ -49,6 +70,135 @@ struct oxnas_stdclk_data {
 #define CLK_SET_REGOFFSET	0x2c
 #define CLK_CLR_REGOFFSET	0x30
 
+#define PLLA_CTRL0_REGOFFSET	0x1f0
+#define PLLA_CTRL1_REGOFFSET	0x1f4
+#define PLLB_CTRL0_REGOFFSET	0x1001f0
+#define MHZ (1000 * 1000)
+
+struct clk_oxnas_pll {
+	struct clk_hw hw;
+	struct device_node *devnode;
+	struct reset_control *rstc;
+	struct regmap *syscon;
+};
+
+#define to_clk_oxnas_pll(_hw) container_of(_hw, struct clk_oxnas_pll, hw)
+
+static unsigned long plla_clk_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct clk_oxnas_pll *plla = to_clk_oxnas_pll(hw);
+	unsigned long fin = parent_rate;
+	unsigned long refdiv, outdiv;
+	unsigned int pll0, fbdiv;
+
+	BUG_ON(regmap_read(plla->syscon, PLLA_CTRL0_REGOFFSET, &pll0));
+
+	refdiv = (pll0 >> PLLA_REFDIV_SHIFT) & PLLA_REFDIV_MASK;
+	refdiv += 1;
+	outdiv = (pll0 >> PLLA_OUTDIV_SHIFT) & PLLA_OUTDIV_MASK;
+	outdiv += 1;
+
+	BUG_ON(regmap_read(plla->syscon, PLLA_CTRL1_REGOFFSET, &fbdiv));
+	/* seems we will not be here when pll is bypassed, so ignore this
+	 * case */
+
+	return fin / MHZ * fbdiv / (refdiv * outdiv) / 32768 * MHZ;
+}
+
+static const char *pll_clk_parents[] = {
+	"oscillator",
+};
+
+static struct clk_ops plla_ops = {
+	.recalc_rate = plla_clk_recalc_rate,
+};
+
+static struct clk_init_data clk_plla_init = {
+	.name = "plla",
+	.ops = &plla_ops,
+	.parent_names = pll_clk_parents,
+	.num_parents = ARRAY_SIZE(pll_clk_parents),
+};
+
+static int pllb_clk_is_prepared(struct clk_hw *hw)
+{
+	struct clk_oxnas_pll *pllb = to_clk_oxnas_pll(hw);
+
+	return !!pllb->rstc;
+}
+
+static int pllb_clk_prepare(struct clk_hw *hw)
+{
+	struct clk_oxnas_pll *pllb = to_clk_oxnas_pll(hw);
+
+	pllb->rstc = of_reset_control_get(pllb->devnode, NULL);
+
+	return IS_ERR(pllb->rstc) ? PTR_ERR(pllb->rstc) : 0;
+}
+
+static void pllb_clk_unprepare(struct clk_hw *hw)
+{
+	struct clk_oxnas_pll *pllb = to_clk_oxnas_pll(hw);
+
+	BUG_ON(IS_ERR(pllb->rstc));
+
+	reset_control_put(pllb->rstc);
+	pllb->rstc = NULL;
+}
+
+static int pllb_clk_enable(struct clk_hw *hw)
+{
+	struct clk_oxnas_pll *pllb = to_clk_oxnas_pll(hw);
+
+	BUG_ON(IS_ERR(pllb->rstc));
+
+	/* put PLL into bypass */
+	regmap_update_bits(pllb->syscon, PLLB_CTRL0_REGOFFSET, BIT(PLLB_BYPASS), BIT(PLLB_BYPASS));
+	wmb();
+	udelay(10);
+	reset_control_assert(pllb->rstc);
+	udelay(10);
+	/* set PLL B control information */
+	regmap_write_bits(pllb->syscon, PLLB_CTRL0_REGOFFSET, 0xffff,
+			  (1 << PLLB_ENSAT) | (1 << PLLB_OUTDIV) | (2 << PLLB_REFDIV));
+	reset_control_deassert(pllb->rstc);
+	udelay(100);
+	regmap_update_bits(pllb->syscon, PLLB_CTRL0_REGOFFSET, BIT(PLLB_BYPASS), 0);
+
+	return 0;
+}
+
+static void pllb_clk_disable(struct clk_hw *hw)
+{
+	struct clk_oxnas_pll *pllb = to_clk_oxnas_pll(hw);
+
+	BUG_ON(IS_ERR(pllb->rstc));
+
+	/* put PLL into bypass */
+	regmap_update_bits(pllb->syscon, PLLB_CTRL0_REGOFFSET, BIT(PLLB_BYPASS), BIT(PLLB_BYPASS));
+
+	wmb();
+	udelay(10);
+
+	reset_control_assert(pllb->rstc);
+}
+
+static struct clk_ops pllb_ops = {
+	.prepare = pllb_clk_prepare,
+	.unprepare = pllb_clk_unprepare,
+	.is_prepared = pllb_clk_is_prepared,
+	.enable = pllb_clk_enable,
+	.disable = pllb_clk_disable,
+};
+
+static struct clk_init_data clk_pllb_init = {
+	.name = "pllb",
+	.ops = &pllb_ops,
+	.parent_names = pll_clk_parents,
+	.num_parents = ARRAY_SIZE(pll_clk_parents),
+};
+
 static inline struct clk_oxnas_gate *to_clk_oxnas_gate(struct clk_hw *hw)
 {
 	return container_of(hw, struct clk_oxnas_gate, hw);
@@ -262,3 +412,42 @@ static struct platform_driver oxnas_stdc
 	},
 };
 builtin_platform_driver(oxnas_stdclk_driver);
+
+void __init oxnas_init_plla(struct device_node *np)
+{
+	struct clk *clk;
+	struct clk_oxnas_pll *plla;
+
+	plla = kmalloc(sizeof(*plla), GFP_KERNEL);
+	BUG_ON(!plla);
+
+	plla->syscon = syscon_node_to_regmap(of_get_parent(np));
+	plla->hw.init = &clk_plla_init;
+	plla->devnode = np;
+	plla->rstc = NULL;
+	clk = clk_register(NULL, &plla->hw);
+	BUG_ON(IS_ERR(clk));
+	/* mark it as enabled */
+	clk_prepare_enable(clk);
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+CLK_OF_DECLARE(oxnas_plla, "plxtech,nas782x-plla", oxnas_init_plla);
+
+void __init oxnas_init_pllb(struct device_node *np)
+{
+	struct clk *clk;
+	struct clk_oxnas_pll *pllb;
+
+	pllb = kmalloc(sizeof(*pllb), GFP_KERNEL);
+	BUG_ON(!pllb);
+
+	pllb->syscon = syscon_node_to_regmap(of_get_parent(np));
+	pllb->hw.init = &clk_pllb_init;
+	pllb->devnode = np;
+	pllb->rstc = NULL;
+
+	clk = clk_register(NULL, &pllb->hw);
+	BUG_ON(IS_ERR(clk));
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+CLK_OF_DECLARE(oxnas_pllb, "plxtech,nas782x-pllb", oxnas_init_pllb);
--- a/arch/arm/boot/dts/ox820.dtsi
+++ b/arch/arm/boot/dts/ox820.dtsi
@@ -60,12 +60,6 @@
 			clocks = <&osc>;
 		};
 
-		plla: plla {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <850000000>;
-		};
-
 		armclk: armclk {
 			compatible = "fixed-factor-clock";
 			#clock-cells = <0>;
@@ -265,6 +259,19 @@
 					compatible = "oxsemi,ox820-stdclk", "oxsemi,ox810se-stdclk";
 					#clock-cells = <1>;
 				};
+
+				plla: plla {
+					compatible = "plxtech,nas782x-plla";
+					#clock-cells = <0>;
+					clocks = <&osc>;
+				};
+
+				pllb: pllb {
+					compatible = "plxtech,nas782x-pllb";
+					#clock-cells = <0>;
+					clocks = <&osc>;
+					resets = <&reset RESET_PLLB>;
+				};
 			};
 		};
 
@@ -286,6 +293,13 @@
 				clocks = <&armclk>;
 			};
 
+			watchdog@620 {
+				compatible = "mpcore_wdt";
+				reg = <0x620 0x20>;
+				interrupts = <GIC_PPI 14 (GIC_CPU_MASK_RAW(3)|IRQ_TYPE_LEVEL_HIGH)>;
+				clocks = <&armclk>;
+			};
+
 			gic: gic@1000 {
 				compatible = "arm,arm11mp-gic";
 				interrupt-controller;