2018-02-12 22:00 GMT+01:00 Russell King - ARM Linux <li...@armlinux.org.uk>:
> On Mon, Feb 12, 2018 at 02:51:57PM -0600, David Lechner wrote:
>> On 02/12/2018 08:24 AM, Bartosz Golaszewski wrote:
>> >From: Bartosz Golaszewski <bgolaszew...@baylibre.com>
>> >
>> >The way this function is implemented caused some confusion when
>> >converting the TI DaVinci platform to using the common clock framework.
>> >
>> >Current kernel supports booting DaVinci boards both in device tree as
>> >well as legacy, board-file mode. In the latter, we always end up
>> >calling clk_get_sys() as of_node is NULL and __of_clk_get_by_name()
>> >returns -ENOENT.
>> >
>> >It was not obvious at first glance how clk_get(dev, NULL) will work in
>> >board-file mode since we always call __of_clk_get_by_name(). Let's make
>> >it clearer by checking if of_node is NULL and skipping right to
>> >clk_get_sys().
>> >
>> >Cc: Sekhar Nori <nsek...@ti.com>
>> >Cc: Kevin Hilman <khil...@baylibre.com>
>> >Cc: David Lechner <da...@lechnology.com>
>> >Signed-off-by: Bartosz Golaszewski <bgolaszew...@baylibre.com>
>> >---
>> > drivers/clk/clkdev.c | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> >diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
>> >index 7513411140b6..f394e8964909 100644
>> >--- a/drivers/clk/clkdev.c
>> >+++ b/drivers/clk/clkdev.c
>> >@@ -199,7 +199,7 @@ struct clk *clk_get(struct device *dev, const char
>> >*con_id)
>> > const char *dev_id = dev ? dev_name(dev) : NULL;
>> > struct clk *clk;
>> >- if (dev) {
>> >+ if (dev && dev->of_node) {
>> > clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
>> > if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
>> > return clk;
>> >
>>
>> Shouldn't you be sending this to the linux-clk mailing list and cc'ing
>> the clock maintainers?
>
> No, I'm the maintainer for clkdev, as per MAINTAINERS.
>
>> FWIW, it seems pretty clear to me that if we are using a board file
>> then we should expect clk_get_sys() to be called because there is
>> no device tree.
>
> clk_get() pre-dates DT, and using it has no bearing on whether DT is
> in use or not. The above change looks correct to me - if the
> struct device is not a DT device, then we shouldn't be trying to look
> up the clock in DT.
>
> --
> RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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Hi Russell,
can you pick this patch up for 4.17?
Thanks in advance,
Bartosz
