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

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Date:	Wed, 23 Jan 2013 10:57:46 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Josh Cartwright <joshc@....teric.us>
CC:	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: Add axi-clkgen driver

On 01/22/2013 07:08 PM, Josh Cartwright wrote:
> 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@...afoo.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@...afoo.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).

Nice catch, it's wrong indeed.

Thanks
- Lars

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