clk: sunxi: Add PLL3 clock
The A10 SoCs and relatives have a PLL controller to drive the PLL3 and
PLL7, clocked from a 3MHz oscillator, that drives the display related
clocks (GPU, display engine, TCON, etc.)
Add a driver for it.
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/clk/sunxi/clk-sun4i-pll3.c b/drivers/clk/sunxi/clk-sun4i-pll3.c
new file mode 100644
index 0000000..f66267e
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun4i-pll3.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2015 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.
+ *
+ * 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.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define SUN4I_A10_PLL3_GATE_BIT 31
+#define SUN4I_A10_PLL3_DIV_WIDTH 7
+#define SUN4I_A10_PLL3_DIV_SHIFT 0
+
+static DEFINE_SPINLOCK(sun4i_a10_pll3_lock);
+
+static void __init sun4i_a10_pll3_setup(struct device_node *node)
+{
+ const char *clk_name = node->name, *parent;
+ struct clk_multiplier *mult;
+ struct clk_gate *gate;
+ struct resource res;
+ void __iomem *reg;
+ struct clk *clk;
+ int ret;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+ parent = of_clk_get_parent_name(node, 0);
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(reg)) {
+ pr_err("%s: Could not map the clock registers\n", clk_name);
+ return;
+ }
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto err_unmap;
+
+ gate->reg = reg;
+ gate->bit_idx = SUN4I_A10_PLL3_GATE_BIT;
+ gate->lock = &sun4i_a10_pll3_lock;
+
+ mult = kzalloc(sizeof(*mult), GFP_KERNEL);
+ if (!mult)
+ goto err_free_gate;
+
+ mult->reg = reg;
+ mult->shift = SUN4I_A10_PLL3_DIV_SHIFT;
+ mult->width = SUN4I_A10_PLL3_DIV_WIDTH;
+ mult->lock = &sun4i_a10_pll3_lock;
+
+ clk = clk_register_composite(NULL, clk_name,
+ &parent, 1,
+ NULL, NULL,
+ &mult->hw, &clk_multiplier_ops,
+ &gate->hw, &clk_gate_ops,
+ 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: Couldn't register the clock\n", clk_name);
+ goto err_free_mult;
+ }
+
+ ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ if (ret) {
+ pr_err("%s: Couldn't register DT provider\n",
+ clk_name);
+ goto err_clk_unregister;
+ }
+
+ return;
+
+err_clk_unregister:
+ clk_unregister_composite(clk);
+err_free_mult:
+ kfree(mult);
+err_free_gate:
+ kfree(gate);
+err_unmap:
+ iounmap(reg);
+ of_address_to_resource(node, 0, &res);
+ release_mem_region(res.start, resource_size(&res));
+}
+
+CLK_OF_DECLARE(sun4i_a10_pll3, "allwinner,sun4i-a10-pll3-clk",
+ sun4i_a10_pll3_setup);