[PATCH v4 00/12] ARM/arm64: dts: rcar: Add SYSC PM domains

Thu Apr 7 05:20:23 PDT 2016

	Hi Simon, Magnus,

This patch series adds the R-Car System Controller to the DTS files for
the various Renesas R-Car SoCs, and hooks up devices to their respective
PM domains.

This is a dependency for the enablement of DU and VSP on R-Car H3, as
on this SoC the VSPs are located in a PM Domain.

This series contains 2 parts:
  1. Patches 1-6 add device node for the System Controllers, and hook
     up CPU cores and L2 caches/SCUs to their respective PM Domains,
  2. Patches 7-12 hook up devices to the SYSC "always-on" PM Domain, for
     a more consistent device-power-area description in DT.

While part 1 is safe to apply, part 2 causes more deferred probing,
which exposes a few deficiencies in subsystems and drivers:

  1. The PHY subsystem doesn't support deferred probe, so Micrel
     KSZ8041RNLI (R-Car Gen2) or KSZ9031 (R-Car Gen3) falls back to
     polling:

	irq: no irq domain found for /interrupt-controller at e61c0000 !
	Micrel KSZ8041RNLI ee700000.etherne:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.etherne:01, irq=-1)

	irq: no irq domain found for /soc/gpio at e6052000 !
	Micrel KSZ9031 Gigabit PHY e6800000.etherne:00: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=e6800000.etherne:00, irq=-1)

  2. The Audio DMAC is now initialized after rcar_sound on R-Car Gen2
     and Gen3, so rcar_sound falls back to PIO:

	rcar_sound ec500000.sound: can't get dma channel
	rcar_sound ec500000.sound: ssi[0] fallback to PIO mode
	rcar_sound ec500000.sound: can't get dma channel
	rcar_sound ec500000.sound: ssi[1] fallback to PIO mode

  3. The System DMAC is now initialized after the SPI drivers on R-Car
     Gen2, hence they fall back to PIO:

	renesas_spi e6b10000.spi: dma_request_slave_channel_compat failed
	renesas_spi e6b10000.spi: DMA not available, using PIO

	spi_sh_msiof e6e20000.spi: dma_request_slave_channel_compat failed
	spi_sh_msiof e6e20000.spi: DMA not available, using PIO

  4. On r8a7790/lager, I see various i2c failures:

	adv7180 6-0020: chip found @ 0x20 (e6520000.i2c)
	adv7180: probe of 6-0020 failed with error -110

	i2c 7-0058: Masking da9063 interrupt sources
	i2c 7-0058: i2c error -110
	da9063 7-0058: Cannot read FAULT_LOG.
	da9063 7-0058: Cannot clear fault log
	da9063 7-0058: Cannot read chip model id.
	da9063: probe of 7-0058 failed with error -5
	i2c 7-0068: Masking da9210 interrupt sources
	i2c 7-0068: i2c error -110
	da9210 7-0068: Failed to write to mask reg: -110
	da9210: probe of 7-0068 failed with error -110

Hence for now I think it's best to just apply the first part, to allow
progress on R-Car H3, and postpone the second part until the issues are
sorted out.

Changes compared to v3:
  - Add power-domains properties to the sysc nodes, to refer to the
    SoC's Clock Domains,
  - Extract using the SYSC "always-on" PM Domain on R-Car H3 into its
    own patch,
  - Add patches to use the SYSC "always-on" PM Domain on R-Car H1 and
    R-Car Gen2,
  - Update for recently added can0, can1, pciec0, and pciec1 device
    nodes on R-Car H3.

Changes compared to v2:
  - Move power area hierarchy from DT to C (cfr. DT bindings for Renesas
    CPG/MSSR), and switch to "#power-domain-cells = <1>",
  - Drop fallback compatibility strings, as the bindings are
    SoC-specific,
  - Add an "always-on" power area on R-Car H3.

Changes compared to v1:
  - Add R-Car H3 (r8a7795) support,
  - Use "renesas,<type>-sysc" instead of "renesas,sysc-<type>",
  - Add fallback compatibility strings for R-Car Gen2 and Gen3.

Dependencies:
  - renesas-devel-20160406-v4.6-rc2,
  - "[PATCH v4 0/7] PM / Domains: Add DT bindings for the R-Car System
    Controller",
  - "[PATCH v4 00/11] soc: renesas: Add R-Car SYSC PM Domain Support".
Note that these are hard dependencies: adding SYSC PM Domains to DTS
files without driver support may cause breakage!

For your convenience, I've pushed this, incl. all dependencies, to the
topic/rcar-sysc-pd-v4 branch of
https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git

This has been tested on r8a7779/marzen, r8a7790/lager, r8a7791/koelsch,
r8a7794/alt, and r8a7795/salvator-x.

Thanks for applying part 1 (patches 1-6)!

Geert Uytterhoeven (12):
  ARM: dts: r8a7779: Add SYSC PM Domains
  ARM: dts: r8a7790: Add SYSC PM Domains
  ARM: dts: r8a7791: Add SYSC PM Domains
  ARM: dts: r8a7793: Add SYSC PM Domains
  ARM: dts: r8a7794: Add SYSC PM Domains
  arm64: dts: r8a7795: Add SYSC PM Domains
  ARM: dts: r8a7779: Use SYSC "always-on" PM Domain
  ARM: dts: r8a7790: Use SYSC "always-on" PM Domain
  ARM: dts: r8a7791: Use SYSC "always-on" PM Domain
  ARM: dts: r8a7793: Use SYSC "always-on" PM Domain
  ARM: dts: r8a7794: Use SYSC "always-on" PM Domain
  arm64: dts: r8a7795: Use SYSC "always-on" PM Domain

 arch/arm/boot/dts/r8a7779.dtsi           |  55 ++++++-----
 arch/arm/boot/dts/r8a7790.dtsi           | 156 ++++++++++++++++--------------
 arch/arm/boot/dts/r8a7791.dtsi           | 157 +++++++++++++++++--------------
 arch/arm/boot/dts/r8a7793.dtsi           | 106 +++++++++++----------
 arch/arm/boot/dts/r8a7794.dtsi           | 117 ++++++++++++-----------
 arch/arm64/boot/dts/renesas/r8a7795.dtsi | 124 +++++++++++++-----------
 6 files changed, 395 insertions(+), 320 deletions(-)

-- 
1.9.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds