From b21e20b255a02393727c93b1927a381ce3008fa4 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 19 Jan 2016 13:55:28 +0900 Subject: [PATCH] clk: add fixed rate clock driver This commit intends to implement "fixed-clock" as in Linux. (drivers/clk/clk-fixed-rate.c in Linux) If you need a very simple clock to just provide fixed clock rate like a crystal oscillator, you do not have to write a new driver. This driver can support it. Signed-off-by: Masahiro Yamada Acked-by: Simon Glass --- drivers/clk/Makefile | 2 +- drivers/clk/clk_fixed_rate.c | 57 ++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/clk_fixed_rate.c diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4a6a4a8d72..8aa81f49f4 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -5,7 +5,7 @@ # SPDX-License-Identifier: GPL-2.0+ # -obj-$(CONFIG_CLK) += clk-uclass.o +obj-$(CONFIG_CLK) += clk-uclass.o clk_fixed_rate.o obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o obj-$(CONFIG_SANDBOX) += clk_sandbox.o diff --git a/drivers/clk/clk_fixed_rate.c b/drivers/clk/clk_fixed_rate.c new file mode 100644 index 0000000000..8beda9cb55 --- /dev/null +++ b/drivers/clk/clk_fixed_rate.c @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2016 Masahiro Yamada + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +struct clk_fixed_rate { + unsigned long fixed_rate; +}; + +#define to_clk_fixed_rate(dev) ((struct clk_fixed_rate *)dev_get_platdata(dev)) + +static ulong clk_fixed_rate_get_rate(struct udevice *dev) +{ + return to_clk_fixed_rate(dev)->fixed_rate; +} + +static ulong clk_fixed_rate_get_periph_rate(struct udevice *dev, int periph) +{ + return clk_fixed_rate_get_rate(dev); +} + +const struct clk_ops clk_fixed_rate_ops = { + .get_rate = clk_fixed_rate_get_rate, + .get_periph_rate = clk_fixed_rate_get_periph_rate, +}; + +static int clk_fixed_rate_ofdata_to_platdata(struct udevice *dev) +{ + to_clk_fixed_rate(dev)->fixed_rate = + fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "clock-frequency", 0); + + return 0; +} + +static const struct udevice_id clk_fixed_rate_match[] = { + { + .compatible = "fixed-clock", + }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(clk_fixed_rate) = { + .name = "fixed_rate_clock", + .id = UCLASS_CLK, + .of_match = clk_fixed_rate_match, + .ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct clk_fixed_rate), + .ops = &clk_fixed_rate_ops, +}; -- 2.39.5