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Date: Thu, 2 Mar 2017 19:06:36 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Arushi Singhal <arushisinghal19971997@...il.com>, lars@...afoo.de
Cc: Michael Hennerich <Michael.Hennerich@...log.com>,
Hartmut Knaack <knaack.h@....de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
devel@...verdev.osuosl.org, outreachy-kernel@...glegroups.com
Subject: Re: [PATCH] staging: iio: ad9832: Move header file content to source
file
On 01/03/17 18:37, Arushi Singhal wrote:
> The contents of the header file are used only by this single
> source file. Move content into .c and remove .h.
>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
> drivers/staging/iio/frequency/ad9832.c | 100 +++++++++++++++++++++++++-
> drivers/staging/iio/frequency/ad9832.h | 128 ---------------------------------
> 2 files changed, 99 insertions(+), 129 deletions(-)
> delete mode 100644 drivers/staging/iio/frequency/ad9832.h
>
> diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
> index a5b2f068168d..8302ec91b2d7 100644
> --- a/drivers/staging/iio/frequency/ad9832.c
> +++ b/drivers/staging/iio/frequency/ad9832.c
> @@ -20,7 +20,105 @@
> #include <linux/iio/sysfs.h>
> #include "dds.h"
>
> -#include "ad9832.h"
> +#define AD9832_FREQ0LL 0x0
> +#define AD9832_FREQ0HL 0x1
> +#define AD9832_FREQ0LM 0x2
> +#define AD9832_FREQ0HM 0x3
> +#define AD9832_FREQ1LL 0x4
> +#define AD9832_FREQ1HL 0x5
> +#define AD9832_FREQ1LM 0x6
> +#define AD9832_FREQ1HM 0x7
> +#define AD9832_PHASE0L 0x8
> +#define AD9832_PHASE0H 0x9
> +#define AD9832_PHASE1L 0xA
> +#define AD9832_PHASE1H 0xB
> +#define AD9832_PHASE2L 0xC
> +#define AD9832_PHASE2H 0xD
> +#define AD9832_PHASE3L 0xE
> +#define AD9832_PHASE3H 0xF
> +
> +#define AD9832_PHASE_SYM 0x10
> +#define AD9832_FREQ_SYM 0x11
> +#define AD9832_PINCTRL_EN 0x12
> +#define AD9832_OUTPUT_EN 0x13
> +
> +/* Command Control Bits */
> +
> +#define AD9832_CMD_PHA8BITSW 0x1
> +#define AD9832_CMD_PHA16BITSW 0x0
> +#define AD9832_CMD_FRE8BITSW 0x3
> +#define AD9832_CMD_FRE16BITSW 0x2
> +#define AD9832_CMD_FPSELECT 0x6
> +#define AD9832_CMD_SYNCSELSRC 0x8
> +#define AD9832_CMD_SLEEPRESCLR 0xC
> +
> +#define AD9832_FREQ BIT(11)
> +#define AD9832_PHASE(x) (((x) & 3) << 9)
> +#define AD9832_SYNC BIT(13)
> +#define AD9832_SELSRC BIT(12)
> +#define AD9832_SLEEP BIT(13)
> +#define AD9832_RESET BIT(12)
> +#define AD9832_CLR BIT(11)
> +#define CMD_SHIFT 12
> +#define ADD_SHIFT 8
> +#define AD9832_FREQ_BITS 32
> +#define AD9832_PHASE_BITS 12
> +#define RES_MASK(bits) ((1 << (bits)) - 1)
> +
> +/**
> + * struct ad9832_state - driver instance specific data
> + * @spi: spi_device
> + * @avdd: supply regulator for the analog section
> + * @dvdd: supply regulator for the digital section
> + * @mclk: external master clock
> + * @ctrl_fp: cached frequency/phase control word
> + * @ctrl_ss: cached sync/selsrc control word
> + * @ctrl_src: cached sleep/reset/clr word
> + * @xfer: default spi transfer
> + * @msg: default spi message
> + * @freq_xfer: tuning word spi transfer
> + * @freq_msg: tuning word spi message
> + * @phase_xfer: tuning word spi transfer
> + * @phase_msg: tuning word spi message
> + * @data: spi transmit buffer
> + * @phase_data: tuning word spi transmit buffer
> + * @freq_data: tuning word spi transmit buffer
> + */
> +
> +struct ad9832_state {
> + struct spi_device *spi;
> + struct regulator *avdd;
> + struct regulator *dvdd;
> + unsigned long mclk;
> + unsigned short ctrl_fp;
> + unsigned short ctrl_ss;
> + unsigned short ctrl_src;
> + struct spi_transfer xfer;
> + struct spi_message msg;
> + struct spi_transfer freq_xfer[4];
> + struct spi_message freq_msg;
> + struct spi_transfer phase_xfer[2];
> + struct spi_message phase_msg;
> + /*
> + * DMA (thus cache coherency maintenance) requires the
> + * transfer buffers to live in their own cache lines.
> + */
> + union {
> + __be16 freq_data[4]____cacheline_aligned;
> + __be16 phase_data[2];
> + __be16 data;
> + };
> +};
> +
This has come up a few times whilst people have been doing these patches.
Just because the stuff isn't used anywhere else doesn't necessarily mean it
isn't intended to be used elsewhere. In this particular case, platform data
would be provided by a board file (pre device tree method of providing
info to a driver when device is being instantiated). Thus when this driver
moves out of staging, this element will need to go in include/linux/platform_data/*
Superficially it looks like all the above register definitions are suitable for moving
into the C file, but I haven't absolutely checked they aren't used in as values in
this structure (naming makes it unlikely though!)
So, lets have a V2 with just those moved.
Otherwise, a nice little cleanup.
Jonathan
> +struct ad9832_platform_data {
> + unsigned long mclk;
> + unsigned long freq0;
> + unsigned long freq1;
> + unsigned short phase0;
> + unsigned short phase1;
> + unsigned short phase2;
> + unsigned short phase3;
> +};
>
> static unsigned long ad9832_calc_freqreg(unsigned long mclk, unsigned long fout)
> {
> diff --git a/drivers/staging/iio/frequency/ad9832.h b/drivers/staging/iio/frequency/ad9832.h
> deleted file mode 100644
> index 1b08b04482a4..000000000000
> --- a/drivers/staging/iio/frequency/ad9832.h
> +++ /dev/null
> @@ -1,128 +0,0 @@
> -/*
> - * AD9832 SPI DDS driver
> - *
> - * Copyright 2011 Analog Devices Inc.
> - *
> - * Licensed under the GPL-2 or later.
> - */
> -#ifndef IIO_DDS_AD9832_H_
> -#define IIO_DDS_AD9832_H_
> -
> -/* Registers */
> -
> -#define AD9832_FREQ0LL 0x0
> -#define AD9832_FREQ0HL 0x1
> -#define AD9832_FREQ0LM 0x2
> -#define AD9832_FREQ0HM 0x3
> -#define AD9832_FREQ1LL 0x4
> -#define AD9832_FREQ1HL 0x5
> -#define AD9832_FREQ1LM 0x6
> -#define AD9832_FREQ1HM 0x7
> -#define AD9832_PHASE0L 0x8
> -#define AD9832_PHASE0H 0x9
> -#define AD9832_PHASE1L 0xA
> -#define AD9832_PHASE1H 0xB
> -#define AD9832_PHASE2L 0xC
> -#define AD9832_PHASE2H 0xD
> -#define AD9832_PHASE3L 0xE
> -#define AD9832_PHASE3H 0xF
> -
> -#define AD9832_PHASE_SYM 0x10
> -#define AD9832_FREQ_SYM 0x11
> -#define AD9832_PINCTRL_EN 0x12
> -#define AD9832_OUTPUT_EN 0x13
> -
> -/* Command Control Bits */
> -
> -#define AD9832_CMD_PHA8BITSW 0x1
> -#define AD9832_CMD_PHA16BITSW 0x0
> -#define AD9832_CMD_FRE8BITSW 0x3
> -#define AD9832_CMD_FRE16BITSW 0x2
> -#define AD9832_CMD_FPSELECT 0x6
> -#define AD9832_CMD_SYNCSELSRC 0x8
> -#define AD9832_CMD_SLEEPRESCLR 0xC
> -
> -#define AD9832_FREQ BIT(11)
> -#define AD9832_PHASE(x) (((x) & 3) << 9)
> -#define AD9832_SYNC BIT(13)
> -#define AD9832_SELSRC BIT(12)
> -#define AD9832_SLEEP BIT(13)
> -#define AD9832_RESET BIT(12)
> -#define AD9832_CLR BIT(11)
> -#define CMD_SHIFT 12
> -#define ADD_SHIFT 8
> -#define AD9832_FREQ_BITS 32
> -#define AD9832_PHASE_BITS 12
> -#define RES_MASK(bits) ((1 << (bits)) - 1)
> -
> -/**
> - * struct ad9832_state - driver instance specific data
> - * @spi: spi_device
> - * @avdd: supply regulator for the analog section
> - * @dvdd: supply regulator for the digital section
> - * @mclk: external master clock
> - * @ctrl_fp: cached frequency/phase control word
> - * @ctrl_ss: cached sync/selsrc control word
> - * @ctrl_src: cached sleep/reset/clr word
> - * @xfer: default spi transfer
> - * @msg: default spi message
> - * @freq_xfer: tuning word spi transfer
> - * @freq_msg: tuning word spi message
> - * @phase_xfer: tuning word spi transfer
> - * @phase_msg: tuning word spi message
> - * @data: spi transmit buffer
> - * @phase_data: tuning word spi transmit buffer
> - * @freq_data: tuning word spi transmit buffer
> - */
> -
> -struct ad9832_state {
> - struct spi_device *spi;
> - struct regulator *avdd;
> - struct regulator *dvdd;
> - unsigned long mclk;
> - unsigned short ctrl_fp;
> - unsigned short ctrl_ss;
> - unsigned short ctrl_src;
> - struct spi_transfer xfer;
> - struct spi_message msg;
> - struct spi_transfer freq_xfer[4];
> - struct spi_message freq_msg;
> - struct spi_transfer phase_xfer[2];
> - struct spi_message phase_msg;
> - /*
> - * DMA (thus cache coherency maintenance) requires the
> - * transfer buffers to live in their own cache lines.
> - */
> - union {
> - __be16 freq_data[4]____cacheline_aligned;
> - __be16 phase_data[2];
> - __be16 data;
> - };
> -};
> -
> -/*
> - * TODO: struct ad9832_platform_data needs to go into include/linux/iio
> - */
> -
> -/**
> - * struct ad9832_platform_data - platform specific information
> - * @mclk: master clock in Hz
> - * @freq0: power up freq0 tuning word in Hz
> - * @freq1: power up freq1 tuning word in Hz
> - * @phase0: power up phase0 value [0..4095] correlates with 0..2PI
> - * @phase1: power up phase1 value [0..4095] correlates with 0..2PI
> - * @phase2: power up phase2 value [0..4095] correlates with 0..2PI
> - * @phase3: power up phase3 value [0..4095] correlates with 0..2PI
> - */
> -
> -struct ad9832_platform_data {
> - unsigned long mclk;
> - unsigned long freq0;
> - unsigned long freq1;
> - unsigned short phase0;
> - unsigned short phase1;
> - unsigned short phase2;
> - unsigned short phase3;
> -};
> -
> -#endif /* IIO_DDS_AD9832_H_ */
>
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