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rng: meson: make core clock optional
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.glpk@gmx.de> Reported-by: Scott K Logan <logans@cottsay.net> Fixes: bc40eb278b ("drivers/rng: add Amlogic hardware RNG driver") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Scott K Logan <logans@cottsay.net> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
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@ -90,8 +90,9 @@ static int meson_rng_ofdata_to_platdata(struct udevice *dev)
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if (!pdata->base)
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return -ENODEV;
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/* Get optional "core" clock */
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err = clk_get_by_name(dev, "core", &pdata->clk);
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if (err)
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if (err && err != -ENODATA)
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return err;
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return 0;
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