Re: [PATCH] clk: Add axi-clkgen driver

Josh Cartwright
2013-01-22T18:03:43Z

On Wed, Jan 09, 2013 at 07:12:00PM +0100, Lars-Peter Clausen wrote:
> This driver adds support for the AXI clkgen pcore to the common clock framework.
> The AXI clkgen pcore is a AXI front-end to the MMCM_ADV frequency synthesizer
> commonly found in Xilinx FPGAs.
>
> The AXI clkgen pcore is used in Analog Devices' reference designs targeting
> Xilinx FPGAs.
>
> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
> ---
> .../devicetree/bindings/clock/axi-clkgen.txt | 22 ++
> drivers/clk/Kconfig | 8 +
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-axi-clkgen.c | 326 +++++++++++++++++++++
> 4 files changed, 357 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/clock/axi-clkgen.txt
> create mode 100644 drivers/clk/clk-axi-clkgen.c
>
[..]
> diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
> new file mode 100644
> index 0000000..e9db225
> --- /dev/null
> +++ b/drivers/clk/clk-axi-clkgen.c
> @@ -0,0 +1,326 @@
> +/*
> + * AXI clkgen driver
> + *
> + * Copyright 2012-2013 Analog Device Inc.
> + * Author: Lars-Peter Clausen <lars@metafoo.de>
> + *
> + * Licensed under the GPL-2.
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +
> +#define AXI_CLKGEN_REG_UPDATE_ENABLE 0x04
> +#define AXI_CLKGEN_REG_CLK_OUT1 0x08
> +#define AXI_CLKGEN_REG_CLK_OUT2 0x0c
> +#define AXI_CLKGEN_REG_CLK_DIV 0x10
> +#define AXI_CLKGEN_REG_CLK_FB1 0x14
> +#define AXI_CLKGEN_REG_CLK_FB2 0x18
> +#define AXI_CLKGEN_REG_LOCK1 0x1c
> +#define AXI_CLKGEN_REG_LOCK2 0x20
> +#define AXI_CLKGEN_REG_LOCK3 0x24
> +#define AXI_CLKGEN_REG_FILTER1 0x28
> +#define AXI_CLKGEN_REG_FILTER2 0x2c
> +
> +struct axi_clkgen {
> + void __iomem *base;
> + struct clk_hw clk_hw;
> +};
> +
> +static uint32_t axi_clkgen_lookup_filter(unsigned int m)
> +{
> + switch (m) {
> + case 0:
> + return 0x01001990;
> + case 1:
> + return 0x01001190;
> + case 2:
> + return 0x01009890;
> + case 3:
> + return 0x01001890;
> + case 4:
> + return 0x01008890;
> + case 5 ... 8:
> + return 0x01009090;
> + case 9 ... 11:
> + return 0x0100890;

Just checking to ensure this ^ entry is correct, since it looks
different then the others (it may very well be).

Josh