linux-kernel - Re: [PATCH V5 2/5] tty: serial: meson: Move request the register region.

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Date:   Mon, 10 Jan 2022 12:58:19 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Yu Tu <yu.tu@...ogic.com>, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH V5 2/5] tty: serial: meson: Move request the register
 region.

Hi,

On 10. 01. 22, 11:42, Yu Tu wrote:
> This simplifies resetting the UART controller during probe
> and will make it easier to integrate the common clock code
> which will require the registers at probe time as well.

And you are *also* switching devm_request_mem_region+devm_ioremap into 
devm_ioremap_resource without even noting it here. It should've been 
done in a separate patch.

And no, do not resend a new version in the next few days. Having v5 in 
20 days is a bit too much. Give maintainers and reviewers some more 
space to express themselves.
> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
> ---
>   drivers/tty/serial/meson_uart.c | 24 ++++++------------------
>   1 file changed, 6 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 45e00d928253..7570958d010c 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -395,24 +395,11 @@ static int meson_uart_verify_port(struct uart_port *port,
>   
>   static void meson_uart_release_port(struct uart_port *port)
>   {
> -	devm_iounmap(port->dev, port->membase);
> -	port->membase = NULL;
> -	devm_release_mem_region(port->dev, port->mapbase, port->mapsize);
> +	/* nothing to do */
>   }
>   
>   static int meson_uart_request_port(struct uart_port *port)
>   {
> -	if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,
> -				     dev_name(port->dev))) {
> -		dev_err(port->dev, "Memory region busy\n");
> -		return -EBUSY;
> -	}
> -
> -	port->membase = devm_ioremap(port->dev, port->mapbase,
> -					     port->mapsize);
> -	if (!port->membase)
> -		return -ENOMEM;
> -
>   	return 0;
>   }
>   
> @@ -733,6 +720,10 @@ static int meson_uart_probe(struct platform_device *pdev)
>   	if (!port)
>   		return -ENOMEM;
>   
> +	port->membase = devm_ioremap_resource(&pdev->dev, res_mem);
> +	if (IS_ERR(port->membase))
> +		return PTR_ERR(port->membase);
> +
>   	ret = meson_uart_probe_clocks(pdev, port);
>   	if (ret)
>   		return ret;
> @@ -754,10 +745,7 @@ static int meson_uart_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, port);
>   
>   	/* reset port before registering (and possibly registering console) */
> -	if (meson_uart_request_port(port) >= 0) {
> -		meson_uart_reset(port);
> -		meson_uart_release_port(port);
> -	}
> +	meson_uart_reset(port);
>   
>   	ret = uart_add_one_port(&meson_uart_driver, port);
>   	if (ret)

thanks,
-- 
js
suse labs