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Message-ID: <01066e66-5d97-ab40-b4a6-99e962b47073@kernel.org>
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
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