linux-kernel - Re: [PATCH 3/5] fpga manager: xilinx-spi: remove unneeded, mistyped variables

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Date:   Thu, 18 Jun 2020 18:38:30 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Luca Ceresoli <luca@...aceresoli.net>
Cc:     linux-fpga@...r.kernel.org, Moritz Fischer <mdf@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Anatolij Gustschin <agust@...x.de>
Subject: Re: [PATCH 3/5] fpga manager: xilinx-spi: remove unneeded, mistyped
 variables

On Thu, Jun 11, 2020 at 11:11:42PM +0200, Luca Ceresoli wrote:
> Using variables does not add readability here: parameters passed
> to udelay*() are obviously in microseconds and their meaning is clear
> from the context.
> 
> The type is also wrong, udelay expects an unsigned long.
> 
> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
> ---
>  drivers/fpga/xilinx-spi.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c
> index 79106626c3f8..799ae04301be 100644
> --- a/drivers/fpga/xilinx-spi.c
> +++ b/drivers/fpga/xilinx-spi.c
> @@ -41,8 +41,6 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
>  				 const char *buf, size_t count)
>  {
>  	struct xilinx_spi_conf *conf = mgr->priv;
> -	const size_t prog_latency_7500us = 7500;
> -	const size_t prog_pulse_1us = 1;
>  
>  	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
>  		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
> @@ -51,7 +49,7 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
>  
>  	gpiod_set_value(conf->prog_b, 1);
>  
> -	udelay(prog_pulse_1us); /* min is 500 ns */
> +	udelay(1); /* min is 500 ns */
>  
>  	gpiod_set_value(conf->prog_b, 0);
>  
> @@ -61,7 +59,7 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
>  	}
>  
>  	/* program latency */
> -	usleep_range(prog_latency_7500us, prog_latency_7500us + 100);
> +	usleep_range(7500, 7600);
>  	return 0;
>  }
>  
> -- 
> 2.27.0
> 
Applied to for-next,

Thanks!