On 25/09/2020 09:19, Neil Armstrong wrote:
> This fixes HWRNG support on Amlogic GXL, GXM, G12A, G12B & SM1
> based boards dues to the lack of the core clock in the device tree.
>
> It was reported breaking EFI boot in the Linux EFI stub, because the
> EFI_RNG_PROTOCOL didn't check for the RNG device presence before
> installing itself.
>
> The Linux amlogic,meson-rng.yaml doesn't mandate the core clock,
> this the clock should be ignores if not present.
>
> Nevertheless, the clock should be present and this should be fixed
> on the Linux meson-gxl.dtsi & meson-g12-common.dtsi then synced
> with U-Boot.
>
> The change has been tested on a Khadas VIM3, which uses the common
> meson-g12-common.dtsi like the Odroid-C4 & Odroid-N2 in Scott's
> report, along with the RNG cmd.
>
> Cc: Heinrich Schuchardt <xypron.g...@gmx.de>
> Reported-by: Scott K Logan <log...@cottsay.net>
> Fixes: bc40eb278b ("drivers/rng: add Amlogic hardware RNG driver")
> Signed-off-by: Neil Armstrong <narmstr...@baylibre.com>
> ---
> drivers/rng/meson-rng.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/rng/meson-rng.c b/drivers/rng/meson-rng.c
> index 4b81a62353..57a5a702a2 100644
> --- a/drivers/rng/meson-rng.c
> +++ b/drivers/rng/meson-rng.c
> @@ -90,8 +90,9 @@ static int meson_rng_ofdata_to_platdata(struct udevice *dev)
> if (!pdata->base)
> return -ENODEV;
>
> + /* Get optional "core" clock */
> err = clk_get_by_name(dev, "core", &pdata->clk);
> - if (err)
> + if (err && err != -ENODATA)
> return err;
>
> return 0;
>
Applied to u-boot-amlogic
Neil
