Re: [PATCHv7] drivers/amba: add reset control to amba bus probe

From: Linus Walleij
Date: Tue Sep 03 2019 - 11:08:14 EST

On Tue, Sep 3, 2019 at 4:20 PM Dinh Nguyen <dinguyen@xxxxxxxxxx> 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@xxxxxxxxxx>
> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
> Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>

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

Please put this patch into Russell's patch tracker.

Linus Walleij