lkml.org 
[lkml]   [2019]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCHv7] drivers/amba: add reset control to amba bus probe
On Tue, Sep 3, 2019 at 4:20 PM Dinh Nguyen <dinguyen@kernel.org> wrote:

> The primecell controller on some SoCs, i.e. SoCFPGA, is held in reset by
> default. Until recently, the DMA controller was brought out of reset by the
> bootloader(i.e. U-Boot). But a recent change in U-Boot, the peripherals
> that are not used are held in reset and are left to Linux to bring them
> out of reset.
>
> Add a mechanism for getting the reset property and de-assert the primecell
> module from reset if found. This is a not a hard fail if the reset properti
> is not present in the device tree node, so the driver will continue to
> probe.
>
> Because there are different variants of the controller that may have
> multiple reset signals, the code will find all reset(s) specified and
> de-assert them.
>
> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Please put this patch into Russell's patch tracker.

Yours,
Linus Walleij

\
 
 \ /
  Last update: 2019-09-03 17:36    [W:0.065 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site