linux-kernel - Re: [PATCH 4/4] clk: zynq: Use of_init_clk

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Message-ID: <20121219205330.GE1005@beefymiracle.amer.corp.natinst.com>
Date:	Wed, 19 Dec 2012 14:53:30 -0600
From:	Josh Cartwright <josh.cartwright@...com>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Michal Simek <michal.simek@...inx.com>
Cc:	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] clk: zynq: Use of_init_clk_data()

On Wed, Dec 19, 2012 at 12:30:21PM -0800, Stephen Boyd wrote:
> On 12/19/12 11:22, Soren Brinkmann wrote:
[..]
> >
> > A probably unique thing I do is, I set the status of uart0 to disabled. This way
> > I can reuse my rootfs which does not run getty on ttyPS1. And this worked fine
> > before.
> >
> 
> Thanks for testing. It seems that clocks are failing to register. Please
> try this patch.
> 
> --->8-----
> 
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 2be22a2..2734715 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -948,9 +948,9 @@ static int xuartps_probe(struct platform_device *pdev)
>         struct clk *clk;
> 
>         clk = of_clk_get(pdev->dev.of_node, 0);
> -       if (!clk) {
> -               dev_err(&pdev->dev, "no clock specified\n");
> -               return -ENODEV;
> +       if (IS_ERR(clk)) {
> +               dev_err(&pdev->dev, "failed to get clock\n");
> +               return PTR_ERR(clk);
>         }
> 
>         rc = clk_prepare_enable(clk);

Yes, indeed.

As a side note, this is introduced in my patch "serial: xilinx_uartps:
get clock rate info from dts", which is in xilinx/arm-next (and thus in
linux-next), but as far as I can tell, didn't ever make it into the
arm-soc tree.

Michal, did you have plans for pushing this through arm-soc?

Thanks,

  Josh
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