Merge remote-tracking branch 'origin/clock/qoriq' into clock/next

* origin/clock/qoriq:
  clk: ls1028a: Add clock driver for Display output interface
  dt/bindings: clk: Add YAML schemas for LS1028A Display Clock bindings

4 files changed, 366 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/fsl,plldig.yaml b/Documentation/devicetree/bindings/clock/fsl,plldig.yaml
new file mode 100644
index 000000000000..ee5b5c61a471
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/fsl,plldig.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/clock/fsl,plldig.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP QorIQ Layerscape LS1028A Display PIXEL Clock Binding
+
+maintainers:
+  - Wen He <wen.he_1@nxp.com>
+
+description: |
+  NXP LS1028A has a clock domain PXLCLK0 used for the Display output
+  interface in the display core, as implemented in TSMC CLN28HPM PLL.
+  which generate and offers pixel clocks to Display.
+
+properties:
+  compatible:
+    const: fsl,ls1028a-plldig
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 0
+
+  vco-frequency:
+     $ref: '/schemas/types.yaml#/definitions/uint32'
+     description: Optional for VCO frequency of the PLL in Hertz.
+        The VCO frequency of this PLL cannot be changed during runtime
+        only at startup. Therefore, the output frequencies are very
+        limited and might not even closely match the requested frequency.
+        To work around this restriction the user may specify its own
+        desired VCO frequency for the PLL. The frequency has to be in the
+        range of 650000000 to 1300000000.
+        If not set, the default frequency is 1188000000.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - '#clock-cells'
+
+examples:
+  # Display PIXEL Clock node:
+  - |
+    dpclk: clock-display@f1f0000 {
+        compatible = "fsl,ls1028a-plldig";
+        reg = <0x0 0xf1f0000 0x0 0xffff>;
+        #clock-cells = <0>;
+        clocks = <&osc_27m>;
+    };
+
+...
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index c44247d0b83e..bbec55c4aa9b 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -218,6 +218,16 @@ config CLK_QORIQ
 	  This adds the clock driver support for Freescale QorIQ platforms
 	  using common clock framework.
 
+config CLK_LS1028A_PLLDIG
+        tristate "Clock driver for LS1028A Display output"
+        depends on ARCH_LAYERSCAPE || COMPILE_TEST
+        default ARCH_LAYERSCAPE
+        help
+          This driver support the Display output interfaces(LCD, DPHY) pixel clocks
+          of the QorIQ Layerscape LS1028A, as implemented TSMC CLN28HPM PLL. Not all
+          features of the PLL are currently supported by the driver. By default,
+          configured bypass mode with this PLL.
+
 config COMMON_CLK_XGENE
 	bool "Clock driver for APM XGene SoC"
 	default ARCH_XGENE
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 0138fb14e6f8..97d1e5bc6de5 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_ARCH_NPCM7XX)	    	+= clk-npcm7xx.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
 obj-$(CONFIG_COMMON_CLK_OXNAS)		+= clk-oxnas.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
+obj-$(CONFIG_CLK_LS1028A_PLLDIG)	+= clk-plldig.o
 obj-$(CONFIG_COMMON_CLK_PWM)		+= clk-pwm.o
 obj-$(CONFIG_CLK_QORIQ)			+= clk-qoriq.o
 obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o
diff --git a/drivers/clk/clk-plldig.c b/drivers/clk/clk-plldig.c
new file mode 100644
index 000000000000..365edd30da8c
--- /dev/null
+++ b/drivers/clk/clk-plldig.c
@@ -0,0 +1,301 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP
+ *
+ * Clock driver for LS1028A Display output interfaces(LCD, DPHY).
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/bitfield.h>
+
+/* PLLDIG register offsets and bit masks */
+#define PLLDIG_REG_PLLSR            0x24
+#define PLLDIG_LOCK_MASK            BIT(2)
+#define PLLDIG_REG_PLLDV            0x28
+#define PLLDIG_MFD_MASK             GENMASK(7, 0)
+#define PLLDIG_RFDPHI1_MASK         GENMASK(30, 25)
+#define PLLDIG_REG_PLLFM            0x2c
+#define PLLDIG_SSCGBYP_ENABLE       BIT(30)
+#define PLLDIG_REG_PLLFD            0x30
+#define PLLDIG_FDEN                 BIT(30)
+#define PLLDIG_FRAC_MASK            GENMASK(15, 0)
+#define PLLDIG_DTH_MASK             GENMASK(17, 16)
+#define PLLDIG_DTH_DISABLE          3
+#define PLLDIG_REG_PLLCAL1          0x38
+#define PLLDIG_REG_PLLCAL2          0x3c
+
+/* Range of the VCO frequencies, in Hz */
+#define PLLDIG_MIN_VCO_FREQ         650000000
+#define PLLDIG_MAX_VCO_FREQ         1300000000
+
+/* Range of the output frequencies, in Hz */
+#define PHI1_MIN_FREQ               27000000
+#define PHI1_MAX_FREQ               600000000
+
+/* Maximum value of the reduced frequency divider */
+#define MAX_RFDPHI1          63UL
+
+/* Best value of multiplication factor divider */
+#define PLLDIG_DEFAULT_MFD   44
+
+/*
+ * Denominator part of the fractional part of the
+ * loop multiplication factor.
+ */
+#define MFDEN          20480
+
+static const struct clk_parent_data parent_data[] = {
+	{.index = 0},
+};
+
+struct clk_plldig {
+	struct clk_hw hw;
+	void __iomem *regs;
+	unsigned int vco_freq;
+};
+
+#define to_clk_plldig(_hw)	container_of(_hw, struct clk_plldig, hw)
+
+static int plldig_enable(struct clk_hw *hw)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	u32 val;
+
+	val = readl(data->regs + PLLDIG_REG_PLLFM);
+	/*
+	 * Use Bypass mode with PLL off by default, the frequency overshoot
+	 * detector output was disable. SSCG Bypass mode should be enable.
+	 */
+	val |= PLLDIG_SSCGBYP_ENABLE;
+	writel(val, data->regs + PLLDIG_REG_PLLFM);
+
+	return 0;
+}
+
+static void plldig_disable(struct clk_hw *hw)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	u32 val;
+
+	val = readl(data->regs + PLLDIG_REG_PLLFM);
+
+	val &= ~PLLDIG_SSCGBYP_ENABLE;
+	val |= FIELD_PREP(PLLDIG_SSCGBYP_ENABLE, 0x0);
+
+	writel(val, data->regs + PLLDIG_REG_PLLFM);
+}
+
+static int plldig_is_enabled(struct clk_hw *hw)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+
+	return (readl(data->regs + PLLDIG_REG_PLLFM) &
+			      PLLDIG_SSCGBYP_ENABLE);
+}
+
+static unsigned long plldig_recalc_rate(struct clk_hw *hw,
+					unsigned long parent_rate)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	u32 val, rfdphi1;
+
+	val = readl(data->regs + PLLDIG_REG_PLLDV);
+
+	/* Check if PLL is bypassed */
+	if (val & PLLDIG_SSCGBYP_ENABLE)
+		return parent_rate;
+
+	rfdphi1 = FIELD_GET(PLLDIG_RFDPHI1_MASK, val);
+
+	/*
+	 * If RFDPHI1 has a value of 1 the VCO frequency is also divided by
+	 * one.
+	 */
+	if (!rfdphi1)
+		rfdphi1 = 1;
+
+	return DIV_ROUND_UP(data->vco_freq, rfdphi1);
+}
+
+static unsigned long plldig_calc_target_div(unsigned long vco_freq,
+					    unsigned long target_rate)
+{
+	unsigned long div;
+
+	div = DIV_ROUND_CLOSEST(vco_freq, target_rate);
+	div = max(1UL, div);
+	div = min(div, MAX_RFDPHI1);
+
+	return div;
+}
+
+static int plldig_determine_rate(struct clk_hw *hw,
+				 struct clk_rate_request *req)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	unsigned int div;
+
+	if (req->rate < PHI1_MIN_FREQ)
+		req->rate = PHI1_MIN_FREQ;
+	if (req->rate > PHI1_MAX_FREQ)
+		req->rate = PHI1_MAX_FREQ;
+
+	div = plldig_calc_target_div(data->vco_freq, req->rate);
+	req->rate = DIV_ROUND_UP(data->vco_freq, div);
+
+	return 0;
+}
+
+static int plldig_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	unsigned int val, cond;
+	unsigned int rfdphi1;
+
+	if (rate < PHI1_MIN_FREQ)
+		rate = PHI1_MIN_FREQ;
+	if (rate > PHI1_MAX_FREQ)
+		rate = PHI1_MAX_FREQ;
+
+	rfdphi1 = plldig_calc_target_div(data->vco_freq, rate);
+
+	/* update the divider value */
+	val = readl(data->regs + PLLDIG_REG_PLLDV);
+	val &= ~PLLDIG_RFDPHI1_MASK;
+	val |= FIELD_PREP(PLLDIG_RFDPHI1_MASK, rfdphi1);
+	writel(val, data->regs + PLLDIG_REG_PLLDV);
+
+	/* delay 200us make sure that old lock state is cleared */
+	udelay(200);
+
+	/* Wait until PLL is locked or timeout (maximum 1000 usecs) */
+	return readl_poll_timeout_atomic(data->regs + PLLDIG_REG_PLLSR, cond,
+					 cond & PLLDIG_LOCK_MASK, 0,
+					 USEC_PER_MSEC);
+}
+
+static const struct clk_ops plldig_clk_ops = {
+	.enable = plldig_enable,
+	.disable = plldig_disable,
+	.is_enabled = plldig_is_enabled,
+	.recalc_rate = plldig_recalc_rate,
+	.determine_rate = plldig_determine_rate,
+	.set_rate = plldig_set_rate,
+};
+
+static int plldig_init(struct clk_hw *hw)
+{
+	struct clk_plldig *data = to_clk_plldig(hw);
+	struct clk_hw *parent = clk_hw_get_parent(hw);
+	unsigned long parent_rate = clk_hw_get_rate(parent);
+	unsigned long val;
+	unsigned long long lltmp;
+	unsigned int mfd, fracdiv = 0;
+
+	if (!parent)
+		return -EINVAL;
+
+	if (data->vco_freq) {
+		mfd = data->vco_freq / parent_rate;
+		lltmp = data->vco_freq % parent_rate;
+		lltmp *= MFDEN;
+		do_div(lltmp, parent_rate);
+		fracdiv = lltmp;
+	} else {
+		mfd = PLLDIG_DEFAULT_MFD;
+		data->vco_freq = parent_rate * mfd;
+	}
+
+	val = FIELD_PREP(PLLDIG_MFD_MASK, mfd);
+	writel(val, data->regs + PLLDIG_REG_PLLDV);
+
+	if (fracdiv) {
+		val = FIELD_PREP(PLLDIG_FRAC_MASK, fracdiv);
+		/* Enable fractional divider */
+		val |= PLLDIG_FDEN;
+		/* Disable dither */
+		val |= FIELD_PREP(PLLDIG_DTH_MASK, PLLDIG_DTH_DISABLE);
+		writel(val, data->regs + PLLDIG_REG_PLLFD);
+	}
+
+	return 0;
+}
+
+static int plldig_clk_probe(struct platform_device *pdev)
+{
+	struct clk_plldig *data;
+	struct resource *mem;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->regs = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(data->regs))
+		return PTR_ERR(data->regs);
+
+	data->hw.init = CLK_HW_INIT_PARENTS_DATA("dpclk",
+						 parent_data,
+						 &plldig_clk_ops,
+						 0);
+
+	ret = devm_clk_hw_register(dev, &data->hw);
+	if (ret) {
+		dev_err(dev, "failed to register %s clock\n",
+						dev->of_node->name);
+		return ret;
+	}
+
+	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+					  &data->hw);
+	if (ret) {
+		dev_err(dev, "unable to add clk provider\n");
+		return ret;
+	}
+
+	/*
+	 * The frequency of the VCO cannot be changed during runtime.
+	 * Therefore, let the user specify a desired frequency.
+	 */
+	if (!of_property_read_u32(dev->of_node, "vco-frequency",
+				  &data->vco_freq)) {
+		if (data->vco_freq < PLLDIG_MIN_VCO_FREQ ||
+		    data->vco_freq > PLLDIG_MAX_VCO_FREQ)
+			return -EINVAL;
+	}
+
+	return plldig_init(&data->hw);
+}
+
+static const struct of_device_id plldig_clk_id[] = {
+	{ .compatible = "fsl,ls1028a-plldig"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, plldig_clk_id);
+
+static struct platform_driver plldig_clk_driver = {
+	.driver = {
+		.name = "plldig-clock",
+		.of_match_table = plldig_clk_id,
+	},
+	.probe = plldig_clk_probe,
+};
+module_platform_driver(plldig_clk_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Wen He <wen.he_1@nxp.com>");
+MODULE_DESCRIPTION("LS1028A Display output interface pixel clock driver");