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Message-ID: <20181028145108.1079227f@archlinux>
Date: Sun, 28 Oct 2018 14:51:08 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Nishad Kamdar <nishadkamdar@...il.com>
Cc: Slawomir Stepien <sst@...zta.fm>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Hartmut Knaack <knaack.h@....de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/3] staging: iio: ad2s1210: Add device tree support.
On Sun, 28 Oct 2018 13:23:23 +0530
Nishad Kamdar <nishadkamdar@...il.com> wrote:
> Replace platform data with device tree support.
>
> Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
The whole gpio in or out thing makes less and less sense to
me and seems to contradict the datasheet.
If I'm not missing something I would just get rid of the option.
If I am missing something (not hard in the datasheet which, whilst
fairly clear, is a rather long ;)
Jonathan
> ---
> drivers/staging/iio/resolver/Kconfig | 1 +
> drivers/staging/iio/resolver/ad2s1210.c | 17 ++++++++---------
> drivers/staging/iio/resolver/ad2s1210.h | 17 -----------------
> 3 files changed, 9 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/staging/iio/resolver/Kconfig b/drivers/staging/iio/resolver/Kconfig
> index 6a469ee6101f..cc1202ff813d 100644
> --- a/drivers/staging/iio/resolver/Kconfig
> +++ b/drivers/staging/iio/resolver/Kconfig
> @@ -15,6 +15,7 @@ config AD2S90
>
> config AD2S1210
> tristate "Analog Devices ad2s1210 driver"
> + depends on OF
> depends on SPI
> depends on GPIOLIB || COMPILE_TEST
> help
> diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
> index 0234869e9d74..5ecdb5785132 100644
> --- a/drivers/staging/iio/resolver/ad2s1210.c
> +++ b/drivers/staging/iio/resolver/ad2s1210.c
> @@ -17,6 +17,7 @@
> #include <linux/delay.h>
> #include <linux/gpio/consumer.h>
> #include <linux/module.h>
> +#include <linux/of.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> @@ -76,7 +77,6 @@ struct ad2s1210_gpio {
> };
>
> struct ad2s1210_state {
> - const struct ad2s1210_platform_data *pdata;
> struct mutex lock;
> struct spi_device *sdev;
> struct gpio_desc *sample;
> @@ -84,6 +84,7 @@ struct ad2s1210_state {
> struct gpio_desc *a1;
> struct gpio_desc *res0;
> struct gpio_desc *res1;
> + bool gpioin;
> unsigned int fclkin;
> unsigned int fexcit;
> bool hysteresis;
> @@ -314,7 +315,7 @@ static ssize_t ad2s1210_store_control(struct device *dev,
> }
> st->resolution
> = ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
> - if (st->pdata->gpioin) {
> + if (st->gpioin) {
> data = ad2s1210_read_resolution_pin(st);
> if (data != st->resolution)
> dev_warn(dev, "ad2s1210: resolution settings not match\n");
> @@ -376,7 +377,7 @@ static ssize_t ad2s1210_store_resolution(struct device *dev,
> }
> st->resolution
> = ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
> - if (st->pdata->gpioin) {
> + if (st->gpioin) {
> data = ad2s1210_read_resolution_pin(st);
> if (data != st->resolution)
> dev_warn(dev, "ad2s1210: resolution settings not match\n");
> @@ -603,7 +604,7 @@ static int ad2s1210_initial(struct ad2s1210_state *st)
> int ret;
>
> mutex_lock(&st->lock);
> - if (st->pdata->gpioin)
> + if (st->gpioin)
> st->resolution = ad2s1210_read_resolution_pin(st);
> else
> ad2s1210_set_resolution_pin(st);
> @@ -644,7 +645,7 @@ static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
> int ret, i;
> struct spi_device *spi = st->sdev;
> struct ad2s1210_gpio *pin;
> - unsigned long flags = st->pdata->gpioin ? GPIOD_IN : GPIOD_OUT_LOW;
> + unsigned long flags = st->gpioin ? GPIOD_IN : GPIOD_OUT_LOW;
>
> struct ad2s1210_gpio gpios[] = {
> { .ptr = &st->sample, .name = "sample", .flags = GPIOD_IN },
> @@ -673,16 +674,14 @@ static int ad2s1210_probe(struct spi_device *spi)
> {
> struct iio_dev *indio_dev;
> struct ad2s1210_state *st;
> + struct device_node *np = spi->dev.of_node;
> int ret;
>
> - if (!spi->dev.platform_data)
> - return -EINVAL;
> -
> indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> if (!indio_dev)
> return -ENOMEM;
> st = iio_priv(indio_dev);
> - st->pdata = spi->dev.platform_data;
> + st->gpioin = of_property_read_bool(np, "gpioin");
Hmm. This bothered me in the earlier patch. How are we meant to configure
these pins... (and this time I actually loaded the datasheet)
A0 and A1 always seem to be control signals written to the device so
I don't really understand why we would ever want them to be 'inputs'
on our host.
RES0 and RES1 are also control signals. Clearly marked as logic inputs.
The only thing I can think here is there is an evaluation board out there
were we are not in control of these, some other controller is.
That is a pretty weird board if so, hence I would only support the version
where we use GPIO outputs from the host.
This will further simplify patch 1 and get rid fo the need for this
non standard bit of devicetree binding.
> ret = ad2s1210_setup_gpios(st);
> if (ret < 0)
> return ret;
> diff --git a/drivers/staging/iio/resolver/ad2s1210.h b/drivers/staging/iio/resolver/ad2s1210.h
> index 63d479b20a6c..e69de29bb2d1 100644
> --- a/drivers/staging/iio/resolver/ad2s1210.h
> +++ b/drivers/staging/iio/resolver/ad2s1210.h
> @@ -1,17 +0,0 @@
> -/*
> - * ad2s1210.h plaform data for the ADI Resolver to Digital Converters:
> - * AD2S1210
> - *
> - * Copyright (c) 2010-2010 Analog Devices Inc.
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - */
> -#ifndef _AD2S1210_H
> -#define _AD2S1210_H
> -
> -struct ad2s1210_platform_data {
> - bool gpioin;
> -};
> -#endif /* _AD2S1210_H */
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