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SubjectRe: [PATCH v4 0/9] add support for Sama5d2 audio PLLs and enable ClassD
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On 25/07/2017 at 09:37, Quentin Schulz wrote:
> This patch series adds support for the audio PLLs and enables ClassD that
> can be found in ATMEL Sama5d2 SoC.
>
> There are two audio PLLs (PMC and PAD) that shares the same parent (FRAC).
> FRAC can output between 620 and 700MHz and only multiply the rate of its
> parent. The two audio PLLs then divide the FRAC rate to best match the
> asked rate.
>
> I basically took an old patch series posted by Nicolas on December, 6th
> 2016[1][2][3] and the comments Boris did on the first version[4] Nicolas
> sent on July, 15th 2015.
>
> I also fixed the function used to compute the divisors, removed useless
> spinlocks and added a range to the audio frac PLL to stay within vendor's
> supported range. Clocks that are children of gclk (generated-clk) are now
> able to propagate rate to the audio PLL clocks when needed.
>
> However, there are multiple children clocks that could technically
> change the rate of audio_pll (via gck). With the rate locking introduced
> in Jerome Brunet's patch series[5], the first consumer to enable the clock
> will be the one definitely setting the rate of the clock. Without the rate
> locking, the last consumer to set the rate will be able to mess with the
> rate.
> Since audio IPs are most likely to request the same rate, we enforce
> that the only clks able to modify gck rate are those of audio IPs.
>
> To remain consistent, we deny other clocks to be children of audio_pll.

Quentin,

Thanks for having revived this series. Everything's okay on my side for
this v4. I think that my tag isn't missing from any patch of this
series. Now we surely need to define which path it must take...

Best regards,


> v4:
> - initialized the clk_init_data structure,
> - switched to of_clk_parent_fill instead of manually setting
> parent_names,
> - removed include of clkdev.h in favor of slab.h,
> - removed unnecessary second cast in operation,
> - used clamp instead of two conditions,
> - removed dependency on clock-output-names, the name is gotten from DT
> node,
> - merged all three drivers for audio PLLs (FRAC, PMC, PAD) into one,
>
> v3:
> - added a flag per generated clock to know which one is allowed to
> modify audio_pll rate,
> - set the flag in setup function depending on the compatible and the
> clock ID,
>
> v2:
> - split big patch containing dt-binding, pll drivers and classd
> modifications,
> - removed unused AUDIO_PLL_*FOUT* defines from clk-audio-pll-pmc,
> - added conditions for audio pll rate setting restriction for SSC and
> I2S,
> - renamed all mentions of ACLK to GCLK in classD driver,
>
> Thanks,
> Quentin
>
> [1] https://patchwork.kernel.org/patch/9462351/
> [2] https://patchwork.kernel.org/patch/9462347/
> [3] https://patchwork.kernel.org/patch/9462349/
> [4] https://www.spinics.net/lists/arm-kernel/msg436120.html
> [5] http://www.spinics.net/lists/linux-clk/msg17927.html
>
> Cyrille Pitchen (2):
> ARM: dts: at91: sama5d2: add classd nodes
> ARM: dts: at91: sama5d2_xplained: add pin muxing and enable classd
>
> Quentin Schulz (7):
> clk: at91: clk-generated: remove useless divisor loop
> dt-bindings: clk: at91: add audio plls to the compatible list
> clk: at91: add audio pll clock drivers
> clk: at91: clk-generated: create function to find best_diff
> clk: at91: clk-generated: make gclk determine audio_pll rate
> ASoC: atmel-classd: remove aclk clock from DT binding
> ASoC: atmel-classd: remove aclk clock
>
> Documentation/devicetree/bindings/clock/at91-clock.txt | 10 +-
> Documentation/devicetree/bindings/sound/atmel-classd.txt | 9 +-
> arch/arm/boot/dts/at91-sama5d2_xplained.dts | 16 +-
> arch/arm/boot/dts/sama5d2.dtsi | 39 +-
> arch/arm/mach-at91/Kconfig | 4 +-
> drivers/clk/at91/Makefile | 1 +-
> drivers/clk/at91/clk-audio-pll.c | 531 ++++++++-
> drivers/clk/at91/clk-generated.c | 101 +-
> include/linux/clk/at91_pmc.h | 25 +-
> sound/soc/atmel/atmel-classd.c | 47 +-
> 10 files changed, 724 insertions(+), 59 deletions(-)
> create mode 100644 drivers/clk/at91/clk-audio-pll.c
>
> base-commit: 047a0f692a9354d730dad30f25e1ebd8437b32b1
>


--
Nicolas Ferre

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