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Message-ID: <20200930130737.GH2804081@piout.net>
Date: Wed, 30 Sep 2020 15:07:37 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc: linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, jic23@...nel.org,
nicolas.ferre@...rochip.com, ludovic.desroches@...rochip.com
Subject: Re: [PATCH v3 4/4] iio: adc: at91_adc: remove platform data and move
defs in driver file
On 30/09/2020 15:52:16+0300, Alexandru Ardelean wrote:
> The AT91 ADC driver no longer uses the 'at91_add_device_adc' platform data
> type. This is no longer used (at least in mainline drivers).
s/drivers/boards/
>
> This change removes the platform-data initialization from the driver, since
> it is mostly dead code now.
It is definitively dead code, it has been a while that board file
support has been removed for the platforms with this ADC.
>
> Some definitions [from the platform data at91_adc.h include] have been to
> be moved in the driver, since they are needed in the driver.
s/to be//
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
> drivers/iio/adc/at91_adc.c | 51 ++++++++++----------------
> include/linux/platform_data/at91_adc.h | 49 -------------------------
> 2 files changed, 20 insertions(+), 80 deletions(-)
> delete mode 100644 include/linux/platform_data/at91_adc.h
>
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> index 473bffe84fbd..d0e56b1b5949 100644
> --- a/drivers/iio/adc/at91_adc.c
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -22,8 +22,6 @@
> #include <linux/slab.h>
> #include <linux/wait.h>
>
> -#include <linux/platform_data/at91_adc.h>
> -
> #include <linux/iio/iio.h>
> #include <linux/iio/buffer.h>
> #include <linux/iio/trigger.h>
> @@ -153,6 +151,25 @@
> #define TOUCH_SHTIM 0xa
> #define TOUCH_SCTIM_US 10 /* 10us for the Touchscreen Switches Closure Time */
>
> +enum atmel_adc_ts_type {
> + ATMEL_ADC_TOUCHSCREEN_NONE = 0,
> + ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
> + ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
> +};
> +
> +/**
> + * struct at91_adc_trigger - description of triggers
> + * @name: name of the trigger advertised to the user
> + * @value: value to set in the ADC's trigger setup register
> + to enable the trigger
> + * @is_external: Does the trigger rely on an external pin?
> + */
> +struct at91_adc_trigger {
> + const char *name;
> + u8 value;
> + bool is_external;
> +};
> +
> /**
> * struct at91_adc_reg_desc - Various informations relative to registers
> * @channel_base: Base offset for the channel data registers
> @@ -957,30 +974,6 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
> return ret;
> }
>
> -static int at91_adc_probe_pdata(struct at91_adc_state *st,
> - struct platform_device *pdev)
> -{
> - struct at91_adc_data *pdata = pdev->dev.platform_data;
> -
> - if (!pdata)
> - return -EINVAL;
> -
> - st->caps = (struct at91_adc_caps *)
> - platform_get_device_id(pdev)->driver_data;
> -
> - st->use_external = pdata->use_external_triggers;
> - st->vref_mv = pdata->vref;
> - st->channels_mask = pdata->channels_used;
> - st->num_channels = st->caps->num_channels;
> - st->startup_time = pdata->startup_time;
> - st->trigger_number = pdata->trigger_number;
> - st->trigger_list = pdata->trigger_list;
> - st->registers = &st->caps->registers;
> - st->touchscreen_type = pdata->touchscreen_type;
> -
> - return 0;
> -}
> -
> static const struct iio_info at91_adc_info = {
> .read_raw = &at91_adc_read_raw,
> };
> @@ -1157,11 +1150,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>
> st = iio_priv(idev);
>
> - if (pdev->dev.of_node)
> - ret = at91_adc_probe_dt(idev, pdev);
> - else
> - ret = at91_adc_probe_pdata(st, pdev);
> -
> + ret = at91_adc_probe_dt(idev, pdev);
> if (ret) {
> dev_err(&pdev->dev, "No platform data available.\n");
> return -EINVAL;
You can simply do:
if (ret)
return ret;
The debug message is not relevant anymore.
You can also remove:
if (!node)
return -EINVAL;
from at91_adc_probe_dt, there is no way the driver will probe without a
DT node.
> diff --git a/include/linux/platform_data/at91_adc.h b/include/linux/platform_data/at91_adc.h
> deleted file mode 100644
> index f20eaeb827ce..000000000000
> --- a/include/linux/platform_data/at91_adc.h
> +++ /dev/null
> @@ -1,49 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-or-later */
> -/*
> - * Copyright (C) 2011 Free Electrons
> - */
> -
> -#ifndef _AT91_ADC_H_
> -#define _AT91_ADC_H_
> -
> -enum atmel_adc_ts_type {
> - ATMEL_ADC_TOUCHSCREEN_NONE = 0,
> - ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
> - ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
> -};
> -
> -/**
> - * struct at91_adc_trigger - description of triggers
> - * @name: name of the trigger advertised to the user
> - * @value: value to set in the ADC's trigger setup register
> - to enable the trigger
> - * @is_external: Does the trigger rely on an external pin?
> - */
> -struct at91_adc_trigger {
> - const char *name;
> - u8 value;
> - bool is_external;
> -};
> -
> -/**
> - * struct at91_adc_data - platform data for ADC driver
> - * @channels_used: channels in use on the board as a bitmask
> - * @startup_time: startup time of the ADC in microseconds
> - * @trigger_list: Triggers available in the ADC
> - * @trigger_number: Number of triggers available in the ADC
> - * @use_external_triggers: does the board has external triggers availables
> - * @vref: Reference voltage for the ADC in millivolts
> - * @touchscreen_type: If a touchscreen is connected, its type (4 or 5 wires)
> - */
> -struct at91_adc_data {
> - unsigned long channels_used;
> - u8 startup_time;
> - struct at91_adc_trigger *trigger_list;
> - u8 trigger_number;
> - bool use_external_triggers;
> - u16 vref;
> - enum atmel_adc_ts_type touchscreen_type;
> -};
> -
> -extern void __init at91_add_device_adc(struct at91_adc_data *data);
> -#endif
> --
> 2.17.1
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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