The A23 has an almost identical PRCM clock tree. The difference in
the APB0 clock is the smallest divisor is 1, instead of 2.
This patch adds a separate sun8i-a23-apb0-clk driver to support it.
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
Documentation/devicetree/bindings/clock/sunxi.txt | 1 +
drivers/clk/sunxi/Makefile | 4 +-
drivers/clk/sunxi/clk-sun8i-apb0.c | 68 +++++++++++++++++++++++
3 files changed, 72 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/sunxi/clk-sun8i-apb0.c
diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 18030ce..68dbd3d 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -28,6 +28,7 @@ Required properties:
"allwinner,sun8i-a23-ahb1-gates-clk" - for the AHB1 gates on A23
"allwinner,sun4i-a10-apb0-clk" - for the APB0 clock
"allwinner,sun6i-a31-apb0-clk" - for the APB0 clock on A31
+ "allwinner,sun8i-a23-apb0-clk" - for the APB0 clock on A23
"allwinner,sun4i-a10-apb0-gates-clk" - for the APB0 gates on A10
"allwinner,sun5i-a13-apb0-gates-clk" - for the APB0 gates on A13
"allwinner,sun5i-a10s-apb0-gates-clk" - for the APB0 gates on A10s
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index 762fd64..6850cba 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -6,4 +6,6 @@ obj-y += clk-sunxi.o clk-factors.o
obj-y += clk-a10-hosc.o
obj-y += clk-a20-gmac.o
-obj-$(CONFIG_MFD_SUN6I_PRCM) += clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o
+obj-$(CONFIG_MFD_SUN6I_PRCM) += \
+ clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o \
+ clk-sun8i-apb0.o
diff --git a/drivers/clk/sunxi/clk-sun8i-apb0.c b/drivers/clk/sunxi/clk-sun8i-apb0.c
new file mode 100644
index 0000000..196a499
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun8i-apb0.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2014 Chen-Yu Tsai
+ * Author: Chen-Yu Tsai <wens@xxxxxxxx>
+ *
+ * Allwinner A23 APB0 clock driver
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Based on clk-sun6i-apb0.c
+ * Allwinner A31 APB0 clock driver
+ *
+ * Copyright (C) 2014 Free Electrons
+ * Author: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const char *clk_name = np->name;
+ const char *clk_parent;
+ struct resource *r;
+ void __iomem *reg;
+ struct clk *clk;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ reg = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(reg))
+ return PTR_ERR(reg);
+
+ clk_parent = of_clk_get_parent_name(np, 0);
+ if (!clk_parent)
+ return -EINVAL;
+
+ of_property_read_string(np, "clock-output-names", &clk_name);
+
+ /* The A23 APB0 clock is a standard 2 bit wide divider clock */
+ clk = clk_register_divider(&pdev->dev, clk_name, clk_parent, 0, reg,
+ 0, 2, CLK_DIVIDER_POWER_OF_TWO, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ return of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
+ { .compatible = "allwinner,sun8i-a23-apb0-clk" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver sun8i_a23_apb0_clk_driver = {
+ .driver = {
+ .name = "sun8i-a23-apb0-clk",
+ .owner = THIS_MODULE,
+ .of_match_table = sun8i_a23_apb0_clk_dt_ids,
+ },
+ .probe = sun8i_a23_apb0_clk_probe,
+};
+module_platform_driver(sun8i_a23_apb0_clk_driver);
+
+MODULE_AUTHOR("Chen-Yu Tsai <wens@xxxxxxxx>");
+MODULE_DESCRIPTION("Allwinner A23 APB0 clock Driver");
+MODULE_LICENSE("GPL v2");
--
2.0.1
--
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