From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Mike Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>, Chen-Yu Tsai <wens@csie.org>
Cc: linux-clk@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
Andre Przywara <andre.przywara@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Vishnu Patekar <vishnupatekar0510@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Boris Brezillon <boris.brezillon@free-electrons.com>,
Jean-Francois Moine <moinejf@free.fr>,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
Maxime Ripard <maxime.ripard@free-electrons.com>
Subject: [PATCH v2 04/15] clk: sunxi-ng: Add fixed factor clock support
Date: Tue, 7 Jun 2016 22:41:43 +0200 [thread overview]
Message-ID: <20160607204154.31967-5-maxime.ripard@free-electrons.com> (raw)
In-Reply-To: <20160607204154.31967-1-maxime.ripard@free-electrons.com>
Some clocks in the Allwinner SoCs clock units are direct, fixed,
multipliers or dividers from their parent.
Add support for such clocks.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/clk/sunxi-ng/Makefile | 2 ++
drivers/clk/sunxi-ng/ccu_fixed_factor.c | 50 +++++++++++++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_fixed_factor.h | 50 +++++++++++++++++++++++++++++++++
3 files changed, 102 insertions(+)
create mode 100644 drivers/clk/sunxi-ng/ccu_fixed_factor.c
create mode 100644 drivers/clk/sunxi-ng/ccu_fixed_factor.h
diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index 4585443b3771..c59cf2ea509b 100644
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -2,3 +2,5 @@ obj-y += ccu_common.o
obj-y += ccu_reset.o
obj-y += ccu_frac.o
+
+obj-y += ccu_fixed_factor.o
diff --git a/drivers/clk/sunxi-ng/ccu_fixed_factor.c b/drivers/clk/sunxi-ng/ccu_fixed_factor.c
new file mode 100644
index 000000000000..0498dc5340ea
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_fixed_factor.c
@@ -0,0 +1,50 @@
+/*
+ * 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 "ccu_fixed_factor.h"
+
+static unsigned long ccu_fixed_factor_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ccu_fixed_factor *fix = hw_to_ccu_fixed_factor(hw);
+
+ return parent_rate / fix->div * fix->mult;
+}
+
+static long ccu_fixed_factor_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct ccu_fixed_factor *fix = hw_to_ccu_fixed_factor(hw);
+
+ if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
+ unsigned long best_parent;
+
+ best_parent = (rate / fix->mult) * fix->div;
+ *parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
+ best_parent);
+ }
+
+ return *parent_rate / fix->div * fix->mult;
+}
+
+static int ccu_fixed_factor_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ return 0;
+}
+
+const struct clk_ops ccu_fixed_factor_ops = {
+ .recalc_rate = ccu_fixed_factor_recalc_rate,
+ .round_rate = ccu_fixed_factor_round_rate,
+ .set_rate = ccu_fixed_factor_set_rate,
+};
diff --git a/drivers/clk/sunxi-ng/ccu_fixed_factor.h b/drivers/clk/sunxi-ng/ccu_fixed_factor.h
new file mode 100644
index 000000000000..4e53dbc9d10b
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_fixed_factor.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016 Maxime Ripard. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef _CCU_FIXED_FACTOR_H_
+#define _CCU_FIXED_FACTOR_H_
+
+#include <linux/clk-provider.h>
+
+#include "ccu_common.h"
+
+struct ccu_fixed_factor {
+ u16 div;
+ u16 mult;
+
+ struct ccu_common common;
+};
+
+#define SUNXI_CCU_FIXED_FACTOR(_struct, _name, _parent, \
+ _div, _mult, _flags) \
+ struct ccu_fixed_factor _struct = { \
+ .div = _div, \
+ .mult = _mult, \
+ .common = { \
+ .hw.init = SUNXI_HW_INIT(_name, \
+ _parent, \
+ &ccu_fixed_factor_ops, \
+ _flags), \
+ }, \
+ }
+
+static inline struct ccu_fixed_factor *hw_to_ccu_fixed_factor(struct clk_hw *hw)
+{
+ struct ccu_common *common = hw_to_ccu_common(hw);
+
+ return container_of(common, struct ccu_fixed_factor, common);
+}
+
+extern const struct clk_ops ccu_fixed_factor_ops;
+
+#endif /* _CCU_FIXED_FACTOR_H_ */
--
2.8.3
next prev parent reply other threads:[~2016-06-07 20:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 20:41 [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 01/15] dt-bindings: sunxi: Add CCU binding documentation Maxime Ripard
2016-06-08 1:37 ` Chen-Yu Tsai
2016-06-07 20:41 ` [PATCH v2 02/15] clk: sunxi-ng: Add common infrastructure Maxime Ripard
2016-06-09 7:39 ` Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 03/15] clk: sunxi-ng: Add fractional lib Maxime Ripard
2016-06-07 20:41 ` Maxime Ripard [this message]
2016-06-21 1:15 ` [PATCH v2 04/15] clk: sunxi-ng: Add fixed factor clock support Stephen Boyd
2016-06-21 9:24 ` Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 05/15] clk: sunxi-ng: Add gate " Maxime Ripard
2016-06-09 7:39 ` Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 06/15] clk: sunxi-ng: Add mux " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 07/15] clk: sunxi-ng: Add phase " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 08/15] clk: sunxi-ng: Add divider Maxime Ripard
2016-06-09 7:40 ` Jean-Francois Moine
2016-06-11 8:27 ` Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 09/15] clk: sunxi-ng: Add M-P factor clock support Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 10/15] clk: sunxi-ng: Add N-K-factor " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 11/15] clk: sunxi-ng: Add N-M-factor " Maxime Ripard
2016-06-09 7:41 ` Jean-Francois Moine
2016-06-27 20:29 ` Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 12/15] clk: sunxi-ng: Add N-K-M Factor clock Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 13/15] clk: sunxi-ng: Add N-K-M-P factor clock Maxime Ripard
2016-06-21 1:42 ` Stephen Boyd
2016-06-07 20:41 ` [PATCH v2 14/15] clk: sunxi-ng: Add H3 clocks Maxime Ripard
2016-06-09 7:42 ` Jean-Francois Moine
2016-06-25 0:28 ` Michael Turquette
2016-06-26 12:34 ` Maxime Ripard
[not found] ` <146707521689.89261.8354851392822550901@resonance>
2016-06-28 8:32 ` Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 15/15] ARM: dt: sun8i: switch the H3 to the new CCU driver Maxime Ripard
2016-06-21 1:48 ` [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support Stephen Boyd
2016-06-26 16:24 ` Maxime Ripard
2016-06-21 9:40 ` Jean-Francois Moine
2016-06-21 14:47 ` Maxime Ripard
2016-06-21 18:29 ` Jean-Francois Moine
2016-06-27 20:46 ` Maxime Ripard
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