On Tue, Jan 20, 2015 at 8:57 PM, Heikki Krogerus
<heikki.krogerus@xxxxxxxxxxxxxxx> wrote:
> When requesting clock in the platform driver, leaving
> chip->clk value as NULL if -ENOENT is returned, and
> continue. With other errors returning failure. It makes the
> driver usable on platforms that do not provide the clock.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/dma/dw/platform.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
> index 32ea1ac..b183bc0 100644
> --- a/drivers/dma/dw/platform.c
> +++ b/drivers/dma/dw/platform.c
> @@ -180,8 +180,12 @@ static int dw_probe(struct platform_device *pdev)
> chip->dev = dev;
>
> chip->clk = devm_clk_get(chip->dev, "hclk");
> - if (IS_ERR(chip->clk))
> - return PTR_ERR(chip->clk);
> + if (IS_ERR(chip->clk)) {
> + if (PTR_ERR(chip->clk) == -ENOENT)
> + chip->clk = NULL;
This is wrong and reasons are mentioned in this thread:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-March/088437.html
You don't need to set it to NULL, if CONFIG_HAVE_CLK isn't set
the dummy routines would take care of it.
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