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Date: Thu, 15 May 2014 19:32:30 +0200
From: Tomasz Figa <t.figa@...sung.com>
To: linux-samsung-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Mike Turquette <mturquette@...aro.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Tushar Behera <tushar.behera@...aro.org>,
Pankaj Dubey <pankaj.dubey@...sung.com>,
Rahul Sharma <rahul.sharma@...sung.com>,
Mark Brown <broonie@...nel.org>,
Tomasz Figa <tomasz.figa@...il.com>,
Tomasz Figa <t.figa@...sung.com>
Subject: [PATCH RFC 3/4] clk: samsung: Add driver to control CLKOUT line on
Exynos SoCs
This patch introduces a driver that handles configuration of CLKOUT pin
of Exynos SoCs that can be used to output certain clocks from inside of
the SoC to a dedicated output pin.
Signed-off-by: Tomasz Figa <t.figa@...sung.com>
---
.../devicetree/bindings/arm/samsung/pmu.txt | 18 ++++
drivers/clk/samsung/Makefile | 1 +
drivers/clk/samsung/exynos-clkout.c | 107 +++++++++++++++++++++
3 files changed, 126 insertions(+)
create mode 100644 drivers/clk/samsung/exynos-clkout.c
diff --git a/Documentation/devicetree/bindings/arm/samsung/pmu.txt b/Documentation/devicetree/bindings/arm/samsung/pmu.txt
index b562634..67c7272 100644
--- a/Documentation/devicetree/bindings/arm/samsung/pmu.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/pmu.txt
@@ -11,8 +11,26 @@ Properties:
- reg : offset and length of the register set.
+ - #clock-cells : must be zero.
+
+ - clock-names : list of clock names for particular CLKOUT mux inputs in
+ following format:
+ "clkoutN", where N is a decimal number corresponding to
+ CLKOUT mux control bits value for given input, e.g.
+ "clkout0", "clkout7", "clkout15".
+
+ - clocks : list of phandles and specifiers to all input clocks listed in
+ clock-names property.
+
Example :
pmu_system_controller: system-controller@...40000 {
compatible = "samsung,exynos5250-pmu", "syscon";
reg = <0x10040000 0x5000>;
+ #clock-cells = <0>;
+ clock-names = "clkout0", "clkout1", "clkout2", "clkout3",
+ "clkout4", "clkout8", "clkout9";
+ clocks = <&clock CLK_OUT_DMC>, <&clock CLK_OUT_TOP>,
+ <&clock CLK_OUT_LEFTBUS>, <&clock CLK_OUT_RIGHTBUS>,
+ <&clock CLK_OUT_CPU>, <&clock CLK_XXTI>,
+ <&clock CLK_XUSBXTI>;
};
diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile
index 2cb62f8..3c40362 100644
--- a/drivers/clk/samsung/Makefile
+++ b/drivers/clk/samsung/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SOC_EXYNOS5250) += clk-exynos5250.o
obj-$(CONFIG_SOC_EXYNOS5420) += clk-exynos5420.o
obj-$(CONFIG_SOC_EXYNOS5440) += clk-exynos5440.o
obj-$(CONFIG_ARCH_EXYNOS) += clk-exynos-audss.o
+obj-$(CONFIG_ARCH_EXYNOS) += exynos-clkout.o
obj-$(CONFIG_S3C2410_COMMON_CLK)+= clk-s3c2410.o
obj-$(CONFIG_S3C2410_COMMON_DCLK)+= clk-s3c2410-dclk.o
obj-$(CONFIG_S3C2412_COMMON_CLK)+= clk-s3c2412.o
diff --git a/drivers/clk/samsung/exynos-clkout.c b/drivers/clk/samsung/exynos-clkout.c
new file mode 100644
index 0000000..461f1c3
--- /dev/null
+++ b/drivers/clk/samsung/exynos-clkout.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Author: Tomasz Figa <t.figa@...sung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Clock driver for Exynos clock output
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/syscore_ops.h>
+
+#define EXYNOS_CLKOUT_PARENTS 32
+
+#define EXYNOS_PMU_DEBUG_REG 0xa00
+#define EXYNOS_CLKOUT_DISABLE_SHIFT 0
+#define EXYNOS_CLKOUT_MUX_SHIFT 8
+#define EXYNOS_CLKOUT_MUX_MASK 0x1f
+
+static DEFINE_SPINLOCK(clkout_lock);
+
+static void __init exynos_clkout_init(struct device_node *node)
+{
+ const char *parent_names[EXYNOS_CLKOUT_PARENTS];
+ struct clk *parents[EXYNOS_CLKOUT_PARENTS];
+ struct clk_gate *gate;
+ struct clk_mux *mux;
+ int parent_count;
+ struct clk *clk;
+ void *reg;
+ int i;
+
+ /* allocate mux and gate clock structs */
+ mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
+ if (!mux)
+ return;
+
+ gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
+ if (!gate)
+ goto free_mux;
+
+ parent_count = 0;
+ for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i) {
+ char name[] = "clkoutXX";
+
+ snprintf(name, sizeof(name), "clkout%d", i);
+ parents[i] = of_clk_get_by_name(node, name);
+ if (IS_ERR(parents[i])) {
+ parent_names[i] = "none";
+ continue;
+ }
+
+ parent_names[i] = __clk_get_name(parents[i]);
+ parent_count = i + 1;
+ }
+
+ if (!parent_count)
+ goto free_gate;
+
+ reg = of_iomap(node, 0);
+ if (!reg)
+ goto clks_put;
+
+ gate->reg = reg + EXYNOS_PMU_DEBUG_REG;
+ gate->bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT;
+ gate->flags = CLK_GATE_SET_TO_DISABLE;
+ gate->lock = &clkout_lock;
+
+ mux->reg = reg + EXYNOS_PMU_DEBUG_REG;
+ mux->mask = EXYNOS_CLKOUT_MUX_MASK;
+ mux->shift = EXYNOS_CLKOUT_MUX_SHIFT;
+ mux->lock = &clkout_lock;
+
+ clk = clk_register_composite(NULL, "clkout", parent_names,
+ parent_count, &mux->hw,
+ &clk_mux_ops, NULL, NULL, &gate->hw,
+ &clk_gate_ops, 0);
+ if (IS_ERR(clk))
+ goto err_unmap;
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ return;
+
+err_unmap:
+ iounmap(reg);
+clks_put:
+ for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i)
+ if (!IS_ERR(parents[i]))
+ clk_put(parents[i]);
+free_gate:
+ kfree(gate);
+free_mux:
+ kfree(mux);
+
+ pr_err("%s: failed to register clkout clock\n", __func__);
+}
+CLK_OF_DECLARE(exynos4210_clkout, "samsung,exynos4210-pmu", exynos_clkout_init);
+CLK_OF_DECLARE(exynos4412_clkout, "samsung,exynos4x12-pmu", exynos_clkout_init);
+CLK_OF_DECLARE(exynos5250_clkout, "samsung,exynos5250-pmu", exynos_clkout_init);
+CLK_OF_DECLARE(exynos5420_clkout, "samsung,exynos5420-pmu", exynos_clkout_init);
--
1.9.2
--
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