linux-kernel - Re: [PATCH] iio: imu: adis: use new `delay` structure for SPI transfer delays

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Date:   Sat, 7 Dec 2019 11:05:04 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: imu: adis: use new `delay` structure for SPI
 transfer delays

On Wed, 4 Dec 2019 10:09:04 +0200
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> In a recent change to the SPI subsystem [1], a new `delay` struct was added
> to replace the `delay_usecs`. This change replaces the current `delay_secs`
> with `delay` for this driver.
> 
> The `spi_transfer_delay_exec()` function [in the SPI framework] makes sure
> that both `delay_usecs` & `delay` are used (in this order to preserve
> backwards compatibility).
> 
> [1] commit bebcfd272df6485 ("spi: introduce `delay` field for
> `spi_transfer` + spi_transfer_delay_exec()")
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
I don't yet have that patch in my upstream so this will have to wait until
it gets there. Give me a poke if I seem to have forgotten about it.

Thanks,

Jonathan


> ---
>  drivers/iio/imu/adis.c | 27 ++++++++++++++++++---------
>  1 file changed, 18 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
> index 2cd2cc2316c6..95af67470668 100644
> --- a/drivers/iio/imu/adis.c
> +++ b/drivers/iio/imu/adis.c
> @@ -38,7 +38,8 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
> @@ -46,7 +47,8 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
> @@ -54,19 +56,22 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
>  			.tx_buf = adis->tx + 6,
>  			.bits_per_word = 8,
>  			.len = 2,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
>  			.tx_buf = adis->tx + 8,
>  			.bits_per_word = 8,
>  			.len = 2,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  		},
>  	};
>  
> @@ -138,7 +143,8 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->write_delay,
> +			.delay.value = adis->data->write_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
> @@ -146,7 +152,8 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->read_delay,
> +			.delay.value = adis->data->read_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
> @@ -155,14 +162,16 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
>  			.bits_per_word = 8,
>  			.len = 2,
>  			.cs_change = 1,
> -			.delay_usecs = adis->data->read_delay,
> +			.delay.value = adis->data->read_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  			.cs_change_delay.value = adis->data->cs_change_delay,
>  			.cs_change_delay.unit = SPI_DELAY_UNIT_USECS,
>  		}, {
>  			.rx_buf = adis->rx + 2,
>  			.bits_per_word = 8,
>  			.len = 2,
> -			.delay_usecs = adis->data->read_delay,
> +			.delay.value = adis->data->read_delay,
> +			.delay.unit = SPI_DELAY_UNIT_USECS,
>  		},
>  	};
>