Merge tag 'clk-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Pull clk updates from Michael Turquette:
 "The bulk of the changes are updates and fixes to existing clk provider
  drivers, along with a pretty standard number of new drivers.  The core
  recieved a small number of updates as well.

  Core changes of note:
   - removed CLK_IS_ROOT flag

  New clk provider drivers:
   - Renesas r8a7796 clock pulse generator / module standby and
     software reset
   - Allwinner sun8i H3 clock controller unit
   - AmLogic meson8b clock controller (rewritten)
   - AmLogic gxbb clock controller
   - support for some new ICs was added by simple changes to static
     data tables for chips sharing the same family

  Driver updates of note:
   - the Allwinner sunxi clock driver infrastucture was rewritten to
     comform to the state of the art at drivers/clk/sunxi-ng.  The old
     implementation is still supported for backwards compatibility with
     the DT ABI"

* tag 'clk-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (162 commits)
  clk: Makefile: re-sort and clean up
  Revert "clk: gxbb: expose CLKID_MMC_PCLK"
  clk: samsung: Allow modular build of the Audio Subsystem CLKCON driver
  clk: samsung: make clk-s5pv210-audss explicitly non-modular
  clk: exynos5433: remove CLK_IGNORE_UNUSED flag from SPI clocks
  clk: oxnas: Add hardware dependencies
  clk: imx7d: do not set parent of ethernet time/ref clocks
  ARM: dt: sun8i: switch the H3 to the new CCU driver
  clk: sunxi-ng: h3: Fix Kconfig symbol typo
  clk: sunxi-ng: h3: Fix audio clock divider offset
  clk: sunxi-ng: Add H3 clocks
  clk: sunxi-ng: Add N-K-M-P factor clock
  clk: sunxi-ng: Add N-K-M Factor clock
  clk: sunxi-ng: Add N-M-factor clock support
  clk: sunxi-ng: Add N-K-factor clock support
  clk: sunxi-ng: Add M-P factor clock support
  clk: sunxi-ng: Add divider
  clk: sunxi-ng: Add phase clock support
  clk: sunxi-ng: Add mux clock support
  clk: sunxi-ng: Add gate clock support
  ...

1 files changed, 153 insertions, 0 deletions

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
new file mode 100644
index 000000000000..2071822b1e9c
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/rational.h>
+
+#include "ccu_gate.h"
+#include "ccu_nkm.h"
+
+struct _ccu_nkm {
+	unsigned long	n, max_n;
+	unsigned long	k, max_k;
+	unsigned long	m, max_m;
+};
+
+static void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
+			      struct _ccu_nkm *nkm)
+{
+	unsigned long best_rate = 0;
+	unsigned long best_n = 0, best_k = 0, best_m = 0;
+	unsigned long _n, _k, _m;
+
+	for (_k = 1; _k <= nkm->max_k; _k++) {
+		unsigned long tmp_rate;
+
+		rational_best_approximation(rate / _k, parent,
+					    nkm->max_n, nkm->max_m, &_n, &_m);
+
+		tmp_rate = parent * _n * _k / _m;
+
+		if (tmp_rate > rate)
+			continue;
+
+		if ((rate - tmp_rate) < (rate - best_rate)) {
+			best_rate = tmp_rate;
+			best_n = _n;
+			best_k = _k;
+			best_m = _m;
+		}
+	}
+
+	nkm->n = best_n;
+	nkm->k = best_k;
+	nkm->m = best_m;
+}
+
+static void ccu_nkm_disable(struct clk_hw *hw)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+	return ccu_gate_helper_disable(&nkm->common, nkm->enable);
+}
+
+static int ccu_nkm_enable(struct clk_hw *hw)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+	return ccu_gate_helper_enable(&nkm->common, nkm->enable);
+}
+
+static int ccu_nkm_is_enabled(struct clk_hw *hw)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+	return ccu_gate_helper_is_enabled(&nkm->common, nkm->enable);
+}
+
+static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw,
+					unsigned long parent_rate)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+	unsigned long n, m, k;
+	u32 reg;
+
+	reg = readl(nkm->common.base + nkm->common.reg);
+
+	n = reg >> nkm->n.shift;
+	n &= (1 << nkm->n.width) - 1;
+
+	k = reg >> nkm->k.shift;
+	k &= (1 << nkm->k.width) - 1;
+
+	m = reg >> nkm->m.shift;
+	m &= (1 << nkm->m.width) - 1;
+
+	return parent_rate * (n + 1) * (k + 1) / (m + 1);
+}
+
+static long ccu_nkm_round_rate(struct clk_hw *hw, unsigned long rate,
+			      unsigned long *parent_rate)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+	struct _ccu_nkm _nkm;
+
+	_nkm.max_n = 1 << nkm->n.width;
+	_nkm.max_k = 1 << nkm->k.width;
+	_nkm.max_m = 1 << nkm->m.width;
+
+	ccu_nkm_find_best(*parent_rate, rate, &_nkm);
+
+	return *parent_rate * _nkm.n * _nkm.k / _nkm.m;
+}
+
+static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
+			   unsigned long parent_rate)
+{
+	struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+	struct _ccu_nkm _nkm;
+	unsigned long flags;
+	u32 reg;
+
+	_nkm.max_n = 1 << nkm->n.width;
+	_nkm.max_k = 1 << nkm->k.width;
+	_nkm.max_m = 1 << nkm->m.width;
+
+	ccu_nkm_find_best(parent_rate, rate, &_nkm);
+
+	spin_lock_irqsave(nkm->common.lock, flags);
+
+	reg = readl(nkm->common.base + nkm->common.reg);
+	reg &= ~GENMASK(nkm->n.width + nkm->n.shift - 1, nkm->n.shift);
+	reg &= ~GENMASK(nkm->k.width + nkm->k.shift - 1, nkm->k.shift);
+	reg &= ~GENMASK(nkm->m.width + nkm->m.shift - 1, nkm->m.shift);
+
+	reg |= (_nkm.n - 1) << nkm->n.shift;
+	reg |= (_nkm.k - 1) << nkm->k.shift;
+	reg |= (_nkm.m - 1) << nkm->m.shift;
+
+	writel(reg, nkm->common.base + nkm->common.reg);
+
+	spin_unlock_irqrestore(nkm->common.lock, flags);
+
+	ccu_helper_wait_for_lock(&nkm->common, nkm->lock);
+
+	return 0;
+}
+
+const struct clk_ops ccu_nkm_ops = {
+	.disable	= ccu_nkm_disable,
+	.enable		= ccu_nkm_enable,
+	.is_enabled	= ccu_nkm_is_enabled,
+
+	.recalc_rate	= ccu_nkm_recalc_rate,
+	.round_rate	= ccu_nkm_round_rate,
+	.set_rate	= ccu_nkm_set_rate,
+};