Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / clk / sunxi / clk-sun8i-apb0.c

diff --git a/kernel/drivers/clk/sunxi/clk-sun8i-apb0.c b/kernel/drivers/clk/sunxi/clk-sun8i-apb0.c
new file mode 100644 (file)
index 0000000..155d002
--- /dev/null
+++ b/kernel/drivers/clk/sunxi/clk-sun8i-apb0.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2014 Chen-Yu Tsai
+ * Author: Chen-Yu Tsai <wens@csie.org>
+ *
+ * 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@free-electrons.com>
+ *
+ */
+
+#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);
+}
+
+static 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",
+               .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@csie.org>");
+MODULE_DESCRIPTION("Allwinner A23 APB0 clock Driver");
+MODULE_LICENSE("GPL v2");