This patch adds a driver for the THS clock which is present on the Allwinner H3.
Signed-off-by: Josef Gajdusek <a...@atx.name> --- Documentation/devicetree/bindings/clock/sunxi.txt | 1 + drivers/clk/sunxi/Makefile | 1 + drivers/clk/sunxi/clk-h3-ths.c | 98 +++++++++++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 drivers/clk/sunxi/clk-h3-ths.c diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index 23e7bce..6d63b35 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -73,6 +73,7 @@ Required properties: "allwinner,sun8i-h3-usb-clk" - for usb gates + resets on H3 "allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80 "allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80 + "allwinner,sun8i-h3-ths-clk" - for THS on H3 Required properties for all clocks: - reg : shall be the control register address for the clock. diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile index f520af6..1bf8e1c 100644 --- a/drivers/clk/sunxi/Makefile +++ b/drivers/clk/sunxi/Makefile @@ -8,6 +8,7 @@ obj-y += clk-a10-hosc.o obj-y += clk-a10-mod1.o obj-y += clk-a10-pll2.o obj-y += clk-a20-gmac.o +obj-y += clk-h3-ths.o obj-y += clk-mod0.o obj-y += clk-simple-gates.o obj-y += clk-sun8i-bus-gates.o diff --git a/drivers/clk/sunxi/clk-h3-ths.c b/drivers/clk/sunxi/clk-h3-ths.c new file mode 100644 index 0000000..663afc0 --- /dev/null +++ b/drivers/clk/sunxi/clk-h3-ths.c @@ -0,0 +1,98 @@ +/* + * Sunxi THS clock driver + * + * Copyright (C) 2015 Josef Gajdusek + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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_address.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#define SUN8I_H3_THS_CLK_ENABLE 31 +#define SUN8I_H3_THS_CLK_DIVIDER_SHIFT 0 +#define SUN8I_H3_THS_CLK_DIVIDER_WIDTH 2 + +static DEFINE_SPINLOCK(sun8i_h3_ths_clk_lock); + +static const struct clk_div_table sun8i_h3_ths_clk_table[] __initconst = { + { .val = 0, .div = 1 }, + { .val = 1, .div = 2 }, + { .val = 2, .div = 4 }, + { .val = 3, .div = 6 }, + { } /* sentinel */ +}; + +static void __init sun8i_h3_ths_clk_setup(struct device_node *node) +{ + struct clk *clk; + struct clk_gate *gate; + struct clk_divider *div; + const char *parent; + const char *clk_name = node->name; + void __iomem *reg; + int err; + + reg = of_io_request_and_map(node, 0, of_node_full_name(node)); + + if (IS_ERR(reg)) + return; + + gate = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!gate) + goto err_unmap; + + div = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!div) + goto err_gate_free; + + of_property_read_string(node, "clock-output-names", &clk_name); + parent = of_clk_get_parent_name(node, 0); + + gate->reg = reg; + gate->bit_idx = SUN8I_H3_THS_CLK_ENABLE; + gate->lock = &sun8i_h3_ths_clk_lock; + + div->reg = reg; + div->shift = SUN8I_H3_THS_CLK_DIVIDER_SHIFT; + div->width = SUN8I_H3_THS_CLK_DIVIDER_WIDTH; + div->table = sun8i_h3_ths_clk_table; + div->lock = &sun8i_h3_ths_clk_lock; + + clk = clk_register_composite(NULL, clk_name, &parent, 1, + NULL, NULL, + &div->hw, &clk_divider_ops, + &gate->hw, &clk_gate_ops, + CLK_SET_RATE_PARENT); + + if (IS_ERR(clk)) + goto err_div_free; + + err = of_clk_add_provider(node, of_clk_src_simple_get, clk); + if (err) + goto err_unregister_clk; + + return; + +err_unregister_clk: + clk_unregister(clk); +err_gate_free: + kfree(gate); +err_div_free: + kfree(div); +err_unmap: + iounmap(reg); +} + +CLK_OF_DECLARE(sun8i_h3_ths_clk, "allwinner,sun8i-h3-ths-clk", + sun8i_h3_ths_clk_setup); -- 2.4.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/