From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Armstrong Date: Mon, 28 Sep 2020 09:37:14 +0200 Subject: [PATCH] rng: meson: make core clock optional In-Reply-To: <20200925071920.9211-1-narmstrong@baylibre.com> References: <20200925071920.9211-1-narmstrong@baylibre.com> Message-ID: <1925383f-c77b-eefd-68fd-5364e1652c47@baylibre.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 > Reported-by: Scott K Logan > Fixes: bc40eb278b ("drivers/rng: add Amlogic hardware RNG driver") > Signed-off-by: Neil Armstrong > --- > 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