[PATCH] staging: kpc2000: kpc2000_spi: Use new structure for SPI transfer delays

[PATCH] staging: kpc2000: kpc2000_spi: Use new structure for SPI transfer delays

[Sergiu Cuciurean]

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_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@analog.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);
 	}
 
 	/* de-assert chip select to end the sequence */
-- 
2.17.1

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

[Dan Carpenter]

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@analog.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

[PATCH v2] staging: kpc2000: kpc2000_spi: Use new structure for SPI transfer delays

[Sergiu Cuciurean]

In a recent change to the SPI subsystem in commit <bebcfd272df6>
("spi: introduce `delay` field for `spi_transfer` +
spi_transfer_delay_exec()"), a new `delay` struct was added
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).

Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
---

Changelog v1->v2:
*Removed footnote from the commit description
*Convert the delay in nano seconds. In this way, the delay is executed no
matter what unit it is described by.

 drivers/staging/kpc2000/kpc2000_spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/kpc2000/kpc2000_spi.c b/drivers/staging/kpc2000/kpc2000_spi.c
index 1c360daa703d..44017d523da5 100644
--- a/drivers/staging/kpc2000/kpc2000_spi.c
+++ b/drivers/staging/kpc2000/kpc2000_spi.c
@@ -386,8 +386,8 @@ 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)
+			ndelay(spi_delay_to_ns(&transfer->delay, transfer));
 	}
 
 	/* de-assert chip select to end the sequence */
-- 
2.17.1