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| Started by | Stephen Warren <swarren@wwwdotorg.org> |
|---|---|
| First post | 2015-10-09 04:10 +0200 |
| Last post | 2015-10-09 04:10 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH v7] clk: bcm2835: Add support for programming the audio domain clocks Stephen Warren <swarren@wwwdotorg.org> - 2015-10-09 04:10 +0200
| From | Stephen Warren <swarren@wwwdotorg.org> |
|---|---|
| Date | 2015-10-09 04:10 +0200 |
| Subject | Re: [PATCH v7] clk: bcm2835: Add support for programming the audio domain clocks |
| Message-ID | <qhvi9-4YJ-1@gated-at.bofh.it> |
On 10/08/2015 07:37 PM, Eric Anholt wrote: > This adds support for enabling, disabling, and setting the rate of the > audio domain clocks. It will be necessary for setting the pixel clock > for HDMI in the VC4 driver and let us write a cpufreq driver. It will > also improve compatibility with user changes to the firmware's > config.txt, since our previous fixed clocks are unaware of it. > > The firmware also has support for configuring the clocks through the > mailbox channel, but the pixel clock setup by the firmware doesn't > work, and it's Raspberry Pi specific anyway. The only conflicts we > should have with the firmware would be if we made firmware calls that > result in clock management (like opening firmware V3D or ISP access, > which we don't support in upstream), or on hardware over-thermal or > under-voltage (when the firmware would rewrite PLLB to take the ARM > out of overclock). If that happens, our cached .recalc_rate() results > would be incorrect, but that's no worse than our current state where > we used fixed clocks. > > The existing fixed clocks in the code are left in place to provide > backwards compatibility with old device tree files. Acked-by: Stephen Warren <swarren@wwwdotorg.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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