linux-kernel - Re: [PATCH] staging: kpc2000: kpc2000_spi: Use new structure for SPI transfer delays

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Message-ID: <20200302074542.GB4140@kadam>
Date:   Mon, 2 Mar 2020 10:45:42 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sergiu Cuciurean <sergiu.cuciurean@...log.com>
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        gregkh@...uxfoundation.org, simon@...anor.nu, chandra627@...il.com,
        fabian.krueger@....de, gneukum1@...il.com,
        michael.scheiderer@....de
Subject: Re: [PATCH] staging: kpc2000: kpc2000_spi: Use new structure for SPI
 transfer delays

On Thu, Feb 27, 2020 at 04:46:43PM +0200, Sergiu Cuciurean wrote:
> In a recent change to the SPI subsystem [1], a new `delay` struct was added

Don't do [1] footnote, just say "SPI subsystem in commit bebcfd272df6
("spi: introduce `delay` field for `spi_transfer` + spi_transfer_delay_exec()")
You can use footnotes for URLs if you want (not required).

> to replace the `delay_usecs`. This change replaces the current
> `delay_usecs` 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 bebcfd272df6 ("spi: introduce `delay` field for
> `spi_transfer` + spi_transfer_delay_exec()")
> 
> Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> ---
>  drivers/staging/kpc2000/kpc2000_spi.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/kpc2000/kpc2000_spi.c b/drivers/staging/kpc2000/kpc2000_spi.c
> index 1c360daa703d..cc9b147fd437 100644
> --- a/drivers/staging/kpc2000/kpc2000_spi.c
> +++ b/drivers/staging/kpc2000/kpc2000_spi.c
> @@ -386,8 +386,9 @@ kp_spi_transfer_one_message(struct spi_master *master, struct spi_message *m)
>  			}
>  		}
>  
> -		if (transfer->delay_usecs)
> -			udelay(transfer->delay_usecs);
> +		if (transfer->delay.value &&
> +		    (transfer->delay.unit == SPI_DELAY_UNIT_USECS))
> +			udelay(transfer->delay.value);

What if the units are in USEC now?  We should probably not just ignore
it right?

regards,
dan carpenter