linux-kernel - [PATCH 1/2] clk: sunxi: Add support for A80 APBS clock

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Message-Id: <1454337769-4130-2-git-send-email-wens@csie.org>
Date:	Mon,  1 Feb 2016 22:42:48 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Chen-Yu Tsai <wens@...e.org>, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [PATCH 1/2] clk: sunxi: Add support for A80 APBS clock

A80's APBS clock is not the same as the APB0 clock on A23. The A80's
is a zero-based divider, while the A23's is a power-of-two divider.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 Documentation/devicetree/bindings/clock/sunxi.txt |  1 +
 drivers/clk/sunxi/Makefile                        |  2 +-
 drivers/clk/sunxi/clk-sun9i-apbs.c                | 64 +++++++++++++++++++++++
 3 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/sunxi/clk-sun9i-apbs.c

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index e59f57b24777..fad81157798c 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -58,6 +58,7 @@ Required properties:
 	"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
 	"allwinner,sun8i-a23-apb2-gates-clk" - for the APB2 gates on A23
 	"allwinner,sun8i-h3-bus-gates-clk" - for the bus gates on H3
+	"allwinner,sun9i-a80-apbs-clk" - for the APBS clock on A80
 	"allwinner,sun9i-a80-apbs-gates-clk" - for the APBS gates on A80
 	"allwinner,sun4i-a10-dram-gates-clk" - for the DRAM gates on A10
 	"allwinner,sun5i-a13-mbus-clk" - for the MBUS clock on A13
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index 3fd7901d48e4..df433b3f789d 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -17,7 +17,7 @@ obj-y += clk-sun9i-core.o
 obj-y += clk-sun9i-mmc.o
 obj-y += clk-usb.o
 
-obj-$(CONFIG_MACH_SUN9I) += clk-sun8i-apb0.o
+obj-$(CONFIG_MACH_SUN9I) += clk-sun9i-apbs.o
 obj-$(CONFIG_MACH_SUN9I) += clk-sun9i-cpus.o
 
 obj-$(CONFIG_MFD_SUN6I_PRCM) += \
diff --git a/drivers/clk/sunxi/clk-sun9i-apbs.c b/drivers/clk/sunxi/clk-sun9i-apbs.c
new file mode 100644
index 000000000000..aacb92873621
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun9i-apbs.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2016 Chen-Yu Tsai
+ * Author: Chen-Yu Tsai <wens@...e.org>
+ *
+ * Allwinner A80 APBS clock driver
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Based on clk-sun6i-apbs.c
+ * Allwinner A31 APB0 clock driver
+ *
+ * Copyright (C) 2014 Free Electrons
+ * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+static void sun9i_apbs_setup(struct device_node *node)
+{
+	const char *name = node->name;
+	const char *parent;
+	struct resource res;
+	struct clk *clk;
+	void __iomem *reg;
+	int ret;
+
+	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+	if (IS_ERR(reg)) {
+		pr_err("Could not get registers for a80-apbs-clk\n");
+		return;
+	}
+
+	parent = of_clk_get_parent_name(node, 0);
+	if (!parent)
+		return;
+
+	of_property_read_string(node, "clock-output-names", &name);
+
+	/* The A80 APBS clock is a standard 2 bit wide divider clock */
+	clk = clk_register_divider(NULL, name, parent, 0, reg, 0, 2, 0, NULL);
+	if (IS_ERR(clk)) {
+		pr_err("failed to register a80-apbs-clk: %ld\n", PTR_ERR(clk));
+		goto err_unmap;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (ret)
+		goto err_unregister;
+
+	return;
+
+err_unregister:
+	clk_unregister_divider(clk);
+err_unmap:
+	iounmap(reg);
+	of_address_to_resource(node, 0, &res);
+	release_mem_region(res.start, resource_size(&res));
+}
+CLK_OF_DECLARE(sun9i_apbs, "allwinner,sun9i-a80-apbs-clk", sun9i_apbs_setup);
-- 
2.7.0