linux-kernel - Re: [PATCH 1/4] tty: serial: 8250_mtk: Use devm_clk

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Message-ID: <CABuKBeLEui7ufMZ1=wz2kss4Q8yuK2VYt=wDWam6ZkCfd1G+7Q@mail.gmail.com>
Date:	Fri, 24 Apr 2015 12:53:08 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-mediatek@...ts.infradead.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-serial@...r.kernel.org, Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 1/4] tty: serial: 8250_mtk: Use devm_clk_get

2015-04-24 12:31 GMT+02:00 Sascha Hauer <s.hauer@...gutronix.de>:
> On Fri, Apr 24, 2015 at 12:28:33PM +0200, Matthias Brugger wrote:
>> 2015-04-23 10:51 GMT+02:00 Sascha Hauer <s.hauer@...gutronix.de>:
>> > Just because of_clk_get() doesn't mean it should be used. Use devm_clk_get
>> > which is the correct function when a struct device * is available. Also
>> > since it's a devm function we can drop the calls to clk_put(). While at
>> > it also fix a wrong debug message.
>> >
>> > Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
>> > ---
>> >  drivers/tty/serial/8250/8250_mtk.c | 7 ++-----
>> >  1 file changed, 2 insertions(+), 5 deletions(-)
>> >
>> > diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
>> > index 7a11fac..c6901dc 100644
>> > --- a/drivers/tty/serial/8250/8250_mtk.c
>> > +++ b/drivers/tty/serial/8250/8250_mtk.c
>> > @@ -131,18 +131,16 @@ static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
>> >                            struct mtk8250_data *data)
>> >  {
>> >         int err;
>> > -       struct device_node *np = pdev->dev.of_node;
>> >
>> > -       data->uart_clk = of_clk_get(np, 0);
>> > +       data->uart_clk = devm_clk_get(&pdev->dev, NULL);
>> >         if (IS_ERR(data->uart_clk)) {
>> > -               dev_warn(&pdev->dev, "Can't get timer clock\n");
>> > +               dev_warn(&pdev->dev, "Can't get uart clock\n");
>> >                 return PTR_ERR(data->uart_clk);
>> >         }
>> >
>> >         err = clk_prepare_enable(data->uart_clk);
>> >         if (err) {
>> >                 dev_warn(&pdev->dev, "Can't prepare clock\n");
>> > -               clk_put(data->uart_clk);
>> >                 return err;
>> >         }
>> >         p->uartclk = clk_get_rate(data->uart_clk);
>> > @@ -216,7 +214,6 @@ static int mtk8250_remove(struct platform_device *pdev)
>> >         serial8250_unregister_port(data->line);
>> >         if (!IS_ERR(data->uart_clk)) {
>> >                 clk_disable_unprepare(data->uart_clk);
>> > -               clk_put(data->uart_clk);
>> >         }
>>
>> Please delete the braces.
>
> The if() is removed completly in the next patch anyway.

You are right. I propose to merge patch 2 and 3, so you get a clean code.
On the way, can you have a look on the commit message? For me it is
not clear what you want to say.

Cheers,
Matthias

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