Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Pull clk updates from Stephen Boyd:
 "The core framework has a handful of patches this time around, mostly
  due to the clk rate protection support added by Jerome Brunet.

  This feature will allow consumers to lock in a certain rate on the
  output of a clk so that things like audio playback don't hear pops
  when the clk frequency changes due to shared parent clks changing
  rates. Currently the clk API doesn't guarantee the rate of a clk stays
  at the rate you request after clk_set_rate() is called, so this new
  API will allow drivers to express that requirement.

  Beyond this, the core got some debugfs pretty printing patches and a
  couple minor non-critical fixes.

  Looking outside of the core framework diff we have some new driver
  additions and the removal of a legacy TI clk driver. Both of these hit
  high in the dirstat. Also, the removal of the asm-generic/clkdev.h
  file causes small one-liners in all the architecture Kbuild files.

  Overall, the driver diff seems to be the normal stuff that comes all
  the time to fix little problems here and there and to support new
  hardware.

  Summary:

  Core:
   - Clk rate protection
   - Symbolic clk flags in debugfs output
   - Clk registration enabled clks while doing bookkeeping updates

  New Drivers:
   - Spreadtrum SC9860
   - HiSilicon hi3660 stub
   - Qualcomm A53 PLL, SPMI clkdiv, and MSM8916 APCS
   - Amlogic Meson-AXG
   - ASPEED BMC

  Removed Drivers:
   - TI OMAP 3xxx legacy clk (non-DT) support
   - asm*/clkdev.h got removed (not really a driver)

  Updates:
   - Renesas FDP1-0 module clock on R-Car M3-W
   - Renesas LVDS module clock on R-Car V3M
   - Misc fixes to pr_err() prints
   - Qualcomm MSM8916 audio fixes
   - Qualcomm IPQ8074 rounded out support for more peripherals
   - Qualcomm Alpha PLL variants
   - Divider code was using container_of() on bad pointers
   - Allwinner DE2 clks on H3
   - Amlogic minor data fixes and dropping of CLK_IGNORE_UNUSED
   - Mediatek clk driver compile test support
   - AT91 PMC clk suspend/resume restoration support
   - PLL issues fixed on si5351
   - Broadcom IProc PLL calculation updates
   - DVFS support for Armada mvebu CPU clks
   - Allwinner fixed post-divider support
   - TI clkctrl fixes and support for newer SoCs"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (125 commits)
  clk: aspeed: Handle inverse polarity of USB port 1 clock gate
  clk: aspeed: Fix return value check in aspeed_cc_init()
  clk: aspeed: Add reset controller
  clk: aspeed: Register gated clocks
  clk: aspeed: Add platform driver and register PLLs
  clk: aspeed: Register core clocks
  clk: Add clock driver for ASPEED BMC SoCs
  clk: mediatek: adjust dependency of reset.c to avoid unexpectedly being built
  clk: fix reentrancy of clk_enable() on UP systems
  clk: meson-axg: fix potential NULL dereference in axg_clkc_probe()
  clk: Simplify debugfs registration
  clk: Fix debugfs_create_*() usage
  clk: Show symbolic clock flags in debugfs
  clk: renesas: r8a7796: Add FDP clock
  clk: Move __clk_{get,put}() into private clk.h API
  clk: sunxi: Use CLK_IS_CRITICAL flag for critical clks
  clk: Improve flags doc for of_clk_detect_critical()
  arch: Remove clkdev.h asm-generic from Kbuild
  clk: sunxi-ng: a83t: Add M divider to TCON1 clock
  clk: Prepare to remove asm-generic/clkdev.h
  ...

1 files changed, 302 insertions, 0 deletions

diff --git a/drivers/clk/qcom/clk-spmi-pmic-div.c b/drivers/clk/qcom/clk-spmi-pmic-div.c
new file mode 100644
index 000000000000..8672ab84746f
--- /dev/null
+++ b/drivers/clk/qcom/clk-spmi-pmic-div.c
@@ -0,0 +1,302 @@
+/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define REG_DIV_CTL1			0x43
+#define DIV_CTL1_DIV_FACTOR_MASK	GENMASK(2, 0)
+
+#define REG_EN_CTL			0x46
+#define REG_EN_MASK			BIT(7)
+
+struct clkdiv {
+	struct regmap		*regmap;
+	u16			base;
+	spinlock_t		lock;
+
+	struct clk_hw		hw;
+	unsigned int		cxo_period_ns;
+};
+
+static inline struct clkdiv *to_clkdiv(struct clk_hw *hw)
+{
+	return container_of(hw, struct clkdiv, hw);
+}
+
+static inline unsigned int div_factor_to_div(unsigned int div_factor)
+{
+	if (!div_factor)
+		div_factor = 1;
+
+	return 1 << (div_factor - 1);
+}
+
+static inline unsigned int div_to_div_factor(unsigned int div)
+{
+	return min(ilog2(div) + 1, 7);
+}
+
+static bool is_spmi_pmic_clkdiv_enabled(struct clkdiv *clkdiv)
+{
+	unsigned int val = 0;
+
+	regmap_read(clkdiv->regmap, clkdiv->base + REG_EN_CTL, &val);
+
+	return val & REG_EN_MASK;
+}
+
+static int
+__spmi_pmic_clkdiv_set_enable_state(struct clkdiv *clkdiv, bool enable,
+				    unsigned int div_factor)
+{
+	int ret;
+	unsigned int ns = clkdiv->cxo_period_ns;
+	unsigned int div = div_factor_to_div(div_factor);
+
+	ret = regmap_update_bits(clkdiv->regmap, clkdiv->base + REG_EN_CTL,
+				 REG_EN_MASK, enable ? REG_EN_MASK : 0);
+	if (ret)
+		return ret;
+
+	if (enable)
+		ndelay((2 + 3 * div) * ns);
+	else
+		ndelay(3 * div * ns);
+
+	return 0;
+}
+
+static int spmi_pmic_clkdiv_set_enable_state(struct clkdiv *clkdiv, bool enable)
+{
+	unsigned int div_factor;
+
+	regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);
+	div_factor &= DIV_CTL1_DIV_FACTOR_MASK;
+
+	return __spmi_pmic_clkdiv_set_enable_state(clkdiv, enable, div_factor);
+}
+
+static int clk_spmi_pmic_div_enable(struct clk_hw *hw)
+{
+	struct clkdiv *clkdiv = to_clkdiv(hw);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&clkdiv->lock, flags);
+	ret = spmi_pmic_clkdiv_set_enable_state(clkdiv, true);
+	spin_unlock_irqrestore(&clkdiv->lock, flags);
+
+	return ret;
+}
+
+static void clk_spmi_pmic_div_disable(struct clk_hw *hw)
+{
+	struct clkdiv *clkdiv = to_clkdiv(hw);
+	unsigned long flags;
+
+	spin_lock_irqsave(&clkdiv->lock, flags);
+	spmi_pmic_clkdiv_set_enable_state(clkdiv, false);
+	spin_unlock_irqrestore(&clkdiv->lock, flags);
+}
+
+static long clk_spmi_pmic_div_round_rate(struct clk_hw *hw, unsigned long rate,
+					 unsigned long *parent_rate)
+{
+	unsigned int div, div_factor;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	div_factor = div_to_div_factor(div);
+	div = div_factor_to_div(div_factor);
+
+	return *parent_rate / div;
+}
+
+static unsigned long
+clk_spmi_pmic_div_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+	struct clkdiv *clkdiv = to_clkdiv(hw);
+	unsigned int div_factor;
+
+	regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);
+	div_factor &= DIV_CTL1_DIV_FACTOR_MASK;
+
+	return parent_rate / div_factor_to_div(div_factor);
+}
+
+static int clk_spmi_pmic_div_set_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long parent_rate)
+{
+	struct clkdiv *clkdiv = to_clkdiv(hw);
+	unsigned int div_factor = div_to_div_factor(parent_rate / rate);
+	unsigned long flags;
+	bool enabled;
+	int ret;
+
+	spin_lock_irqsave(&clkdiv->lock, flags);
+	enabled = is_spmi_pmic_clkdiv_enabled(clkdiv);
+	if (enabled) {
+		ret = spmi_pmic_clkdiv_set_enable_state(clkdiv, false);
+		if (ret)
+			goto unlock;
+	}
+
+	ret = regmap_update_bits(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1,
+				 DIV_CTL1_DIV_FACTOR_MASK, div_factor);
+	if (ret)
+		goto unlock;
+
+	if (enabled)
+		ret = __spmi_pmic_clkdiv_set_enable_state(clkdiv, true,
+							  div_factor);
+
+unlock:
+	spin_unlock_irqrestore(&clkdiv->lock, flags);
+
+	return ret;
+}
+
+static const struct clk_ops clk_spmi_pmic_div_ops = {
+	.enable = clk_spmi_pmic_div_enable,
+	.disable = clk_spmi_pmic_div_disable,
+	.set_rate = clk_spmi_pmic_div_set_rate,
+	.recalc_rate = clk_spmi_pmic_div_recalc_rate,
+	.round_rate = clk_spmi_pmic_div_round_rate,
+};
+
+struct spmi_pmic_div_clk_cc {
+	int		nclks;
+	struct clkdiv	clks[];
+};
+
+static struct clk_hw *
+spmi_pmic_div_clk_hw_get(struct of_phandle_args *clkspec, void *data)
+{
+	struct spmi_pmic_div_clk_cc *cc = data;
+	int idx = clkspec->args[0] - 1; /* Start at 1 instead of 0 */
+
+	if (idx < 0 || idx >= cc->nclks) {
+		pr_err("%s: index value %u is invalid; allowed range [1, %d]\n",
+		       __func__, clkspec->args[0], cc->nclks);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return &cc->clks[idx].hw;
+}
+
+static int spmi_pmic_clkdiv_probe(struct platform_device *pdev)
+{
+	struct spmi_pmic_div_clk_cc *cc;
+	struct clk_init_data init = {};
+	struct clkdiv *clkdiv;
+	struct clk *cxo;
+	struct regmap *regmap;
+	struct device *dev = &pdev->dev;
+	struct device_node *of_node = dev->of_node;
+	const char *parent_name;
+	int nclks, i, ret, cxo_hz;
+	char name[20];
+	u32 start;
+
+	ret = of_property_read_u32(of_node, "reg", &start);
+	if (ret < 0) {
+		dev_err(dev, "reg property reading failed\n");
+		return ret;
+	}
+
+	regmap = dev_get_regmap(dev->parent, NULL);
+	if (!regmap) {
+		dev_err(dev, "Couldn't get parent's regmap\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(of_node, "qcom,num-clkdivs", &nclks);
+	if (ret < 0) {
+		dev_err(dev, "qcom,num-clkdivs property reading failed, ret=%d\n",
+			ret);
+		return ret;
+	}
+
+	if (!nclks)
+		return -EINVAL;
+
+	cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*cc->clks) * nclks,
+			  GFP_KERNEL);
+	if (!cc)
+		return -ENOMEM;
+	cc->nclks = nclks;
+
+	cxo = clk_get(dev, "xo");
+	if (IS_ERR(cxo)) {
+		ret = PTR_ERR(cxo);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "failed to get xo clock\n");
+		return ret;
+	}
+	cxo_hz = clk_get_rate(cxo);
+	clk_put(cxo);
+
+	parent_name = of_clk_get_parent_name(of_node, 0);
+	if (!parent_name) {
+		dev_err(dev, "missing parent clock\n");
+		return -ENODEV;
+	}
+
+	init.name = name;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+	init.ops = &clk_spmi_pmic_div_ops;
+
+	for (i = 0, clkdiv = cc->clks; i < nclks; i++) {
+		snprintf(name, sizeof(name), "div_clk%d", i + 1);
+
+		spin_lock_init(&clkdiv[i].lock);
+		clkdiv[i].base = start + i * 0x100;
+		clkdiv[i].regmap = regmap;
+		clkdiv[i].cxo_period_ns = NSEC_PER_SEC / cxo_hz;
+		clkdiv[i].hw.init = &init;
+
+		ret = devm_clk_hw_register(dev, &clkdiv[i].hw);
+		if (ret)
+			return ret;
+	}
+
+	return devm_of_clk_add_hw_provider(dev, spmi_pmic_div_clk_hw_get, cc);
+}
+
+static const struct of_device_id spmi_pmic_clkdiv_match_table[] = {
+	{ .compatible = "qcom,spmi-clkdiv" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spmi_pmic_clkdiv_match_table);
+
+static struct platform_driver spmi_pmic_clkdiv_driver = {
+	.driver		= {
+		.name	= "qcom,spmi-pmic-clkdiv",
+		.of_match_table = spmi_pmic_clkdiv_match_table,
+	},
+	.probe		= spmi_pmic_clkdiv_probe,
+};
+module_platform_driver(spmi_pmic_clkdiv_driver);
+
+MODULE_DESCRIPTION("QCOM SPMI PMIC clkdiv driver");
+MODULE_LICENSE("GPL v2");