On 09/10/2015 02:58 PM, Eric Anholt wrote: > This will give us the ability to set the pixel and HDMI state machine > clocks for the VC4 KMS driver, change the CPU frequency, and > potentially gate clocks in the future (once we also write a power > domain driver). It also gives the uart an explicit clock reference, > so that we don't need to change the physical addresses of the old > fixed clk_bcm2835.c clocks for Raspberry Pi 2 port. > > Two clocks get their frequencies updated as a result of this. One is > uart's apb_pclk, which was previously accidentally grabbing the fixed > uart0_pclk due to the apb_pclk not having clk_register_clkdev() > called. The uart doesn't seem to do anything with apb_pclk other than > make sure it's on, so that appears safe (also, as far as I can see, > the apb clock is actually the same as the VPU clock). The other is > EMMC, which according to the docs was supposed to be in the 50-100Mhz > range, but it turns out the firmware needed to change to running it at > the 250Mhz core clock speed to avoid a bug in clock domain crossing. > > Additionally, anything using BCM2835_CLOCK_VPU will now have a correct > clock rate if the user configures the boot-time core clock speed using > config.txt. Acked-by: Stephen Warren <swarren@xxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
