[alsa-devel] [PATCH v3] clk: x86: Add Atom PMC platform clocks

[Stephen Boyd]

On 09/09, Irina Tirdea wrote:
> The BayTrail and CherryTrail platforms provide platform clocks
> through their Power Management Controller (PMC).
> 
> The SoC supports up to 6 clocks (PMC_PLT_CLK[5:0]) with a
> frequency of either 19.2 MHz (PLL) or 25 MHz (XTAL) for BayTrail
> an a frequency of 19.2 MHz (XTAL) for CherryTrail. These clocks
> are available for general system use, where appropriate, and each
> have Control & Frequency register fields associated with them.
> 
> For example, the usage for platform clocks suggested in the datasheet
> is the following:
>   PLT_CLK[2:0] - Camera
>   PLT_CLK[3] - Audio Codec
>   PLT_CLK[4] -
>   PLT_CLK[5] - COMMs
> 
> Signed-off-by: Irina Tirdea <irina.tirdea at intel.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> ---
> 
> Notes:
>     Submitting this patch through the clock tree as requested by
>     Mark Brown. This patch specifically enables the audio MCLK
>     required by Baytrail CR devices (support already merged in
>     Mark's tree)
> 
> Changes from v2:
>  - move clk platform data structures to a separate include file
>  - store clk_hw pointer for the fixed rate clocks
> 
> Changes from v1:
>  - register the clk device as child of pmc device
>  - pass iomem pointer from pmc driver to clk driver to avoid using
> pmc_atom_read()/write() and use readl/writel API instead
>  - use devm_clk_hw_register/clkdev_hw_create instead of
> clk_register/clkdev_create
> 
>  arch/x86/Kconfig                          |   1 +
>  arch/x86/include/asm/pmc_atom.h           |   3 +
>  arch/x86/platform/atom/pmc_atom.c         |  78 +++++-

Will there be problems if this merges through clk tree? If so we
could take the clk driver part and the platform data include part
could be duplicated into both trees. Or clk tree could be pulled
into x86?

The patch looks fine to me.

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