On Tue, Feb 27, 2018 at 08:27:14PM -0600, Samuel Holland wrote:
> + /*
> + * The failure path should not disable the clock or assert the reset,
> + * because the PSCI implementation in firmware relies on this device
> + * being functional. Claiming the clock in this driver is required to
> + * prevent Linux from turning it off.
> + */
> + ret = clk_prepare_enable(clk);
> + if (ret) {
> + dev_err(dev, "Failed to enable bus clock: %d\n", ret);
> + return ret;
> + }You don't need it to be always on though. You only need it to be enabled when you access the registers (on both sides I guess?). So you could very well enable the clock in your registers accessors in Linux, and do the same in the ARISC firmware. That should work. Maxime -- Maxime Ripard, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering https://bootlin.com
signature.asc
Description: PGP signature
