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Subject: Re: [PATCH v6 00/19] Move PMC clocks into Tegra PMC driver
To:     Thierry Reding <thierry.reding@gmail.com>
CC:     <jonathanh@nvidia.com>, <broonie@kernel.org>,
        <lgirdwood@gmail.com>, <perex@perex.cz>, <tiwai@suse.com>,
        <digetx@gmail.com>, <mperttunen@nvidia.com>,
        <gregkh@linuxfoundation.org>, <sboyd@kernel.org>,
        <robh+dt@kernel.org>, <mark.rutland@arm.com>,
        <pdeschrijver@nvidia.com>, <pgaikwad@nvidia.com>,
        <spujar@nvidia.com>, <josephl@nvidia.com>,
        <daniel.lezcano@linaro.org>, <mmaddireddy@nvidia.com>,
        <markz@nvidia.com>, <devicetree@vger.kernel.org>,
        <linux-clk@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
References: <1578370458-3686-1-git-send-email-skomatineni@nvidia.com>
 <20200107122152.GD1964183@ulmo>
From:   Sowjanya Komatineni <skomatineni@nvidia.com>
Message-ID: <1f7d3c1e-115c-e08e-240b-c4df9e68543d@nvidia.com>
Date:   Tue, 7 Jan 2020 08:50:34 -0800
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On 1/7/20 4:21 AM, Thierry Reding wrote:
> On Mon, Jan 06, 2020 at 08:13:59PM -0800, Sowjanya Komatineni wrote:
>> This patch series moves Tegra PMC clocks from clock driver to pmc driver
>> along with the device trees changes and audio driver which uses one of
>> the pmc clock for audio mclk.
>>
>> Tegra PMC has clk_out_1, clk_out_2, clk_out_3 and blink controls which
>> are currently registered by Tegra clock driver using clk_regiser_mux and
>> clk_register_gate which performs direct Tegra PMC register access.
>>
>> When Tegra PMC is in secure mode, any access from non-secure world will
>> not go through.
>>
>> This patch series adds these Tegra PMC clocks and blink controls to Tegra
>> PMC driver with PMC as clock provider and removes them from Tegra clock
>> driver.
>>
>> PMC clock clk_out_1 is dedicated for audio mclk from Tegra30 thru Tegra210
>> and clock driver does inital parent configuration for it and enables them.
>> But this clock should be taken care by audio driver as there is no need
>> to have this clock pre enabled.
>>
>> So, this series also includes patch that updates ASoC driver to take
>> care of parent configuration for mclk if device tree don't specify
>> initial parent configuration using assigned-clock-parents and controls
>> audio mclk enable/disable during ASoC machine startup and shutdown.
>>
>> DTs are also updated to use clk_out_1 as audio mclk rather than extern1.
>>
>> This series also includes a patch for mclk fallback to extern1 when
>> retrieving mclk fails to have this backward compatible of new DT with
>> old kernels.
> Hi Sowjanya,
>
> this looks like it's almost ready to merge. Can you highlight if there
> are any build-time or runtime dependencies between the patches? The
> audio driver changes seem to be mostly isolated from the rest by the
> fallback implementation for legacy device trees.
>
> Is there anything that I need to keep in mind when applying these? And
> would it be fine for Mark to pick up the ASoC patches separately from
> the rest?
>
> Thierry

Yes, ASoC patches can be picked separately.

dependencies are b/w clock and pmc driver patches.

>
>> [v6]:	Changes between v5 and v6 are
>> 	- v5 feedback
>> 	- Added ASoC machine startup and shutdown callbacks to control audio
>> 	  mclk enable/disable and removed default mclk enable from clock driver.
>> 	- Updated tegra_asoc_utils_set_rate to disable mclk only during PLLA
>> 	  rate change and removed disabling PLLA as its already taken care by
>> 	  pll clock driver.
>> 	- Removed tegra_asoc_utils_set_rate call from utils_init as set_rate
>> 	  is set during machine hw_params and during utils_init mclk is
>> 	  already in disabled state and this causes warning during mclk disable
>> 	  in utils_set_rate.
>>
>> [v5]:	Changes between v4 and v5 are
>> 	- v4 feedback
>> 	- updated dt-binding pmc YAML schema with more description on power
>> 	  gate nodes and pad configuration state nodes.
>> 	- update tegra_asoc_utils_set_rate to disable audio mclk only if
>> 	  its in enable state.
>>
>> [v4]:	Changes between v3 and v4 are
>> 	- v3 Feedback
>> 	- Updated clocks clk_m_div2 and clk_m_div4 as osc_div2 and osc_div4.
>> 	  Tegra don't have clk_m_div2, clk_m_div4 and they should actually
>> 	  be osc_div2 and osc_div4 clocks from osc pads.
>> 	- Fixed PMC clock parents to use osc, osc_div2, osc_div4.
>> 	- Register each PMC clock as single clock rather than separate
>> 	  mux and gate clocks.
>> 	- Update ASoC utils to use resource managed APIs rather than
>> 	  using clk_get and clk_put.
>> 	- Updated device tree and ASoC driver to use clk_out_1 instead of
>> 	  clk_out_1_mux as PMC clocks are registered as single clock.
>> 	- Update clock driver init_table to not enable audio related clocks
>> 	  as ASoC utils will do audio clock enables.
>>
>> [v3]:	Changes between v2 and v3 are
>> 	- Removes set parent of clk_out_1_mux to extern1 and enabling
>> 	  extern1 from the clock driver.
>> 	- Doesn't enable clk_out_1 and blink by default in pmc driver
>> 	- Updates ASoC driver to take care of audio mclk parent
>> 	  configuration incase if device tree don't specify assigned
>> 	  clock parent properties and enables mclk using both clk_out_1
>> 	  and extern1.
>> 	- updates all device trees using extern1 as mclk in sound node
>> 	  to use clk_out_1 from pmc.
>> 	- patch for YAML format pmc dt-binding
>> 	- Includes v2 feedback
>>
>> [v2]:	Changes between v1 and v2 are
>> 	- v2 includes patches for adding clk_out_1, clk_out_2, clk_out_3,
>> 	  blink controls to Tegra PMC driver and removing clk-tegra-pmc.
>> 	- feedback related to pmc clocks in Tegra PMC driver from v1
>> 	- Removed patches for WB0 PLLM overrides and PLLE IDDQ PMC programming
>> 	  by the clock driver using helper functions from Tegra PMC.
>>
>>   	  Note:
>> 	  To use helper functions from PMC driver, PMC early init need to
>> 	  happen prior to using helper functions and these helper functions are
>> 	  for PLLM Override and PLLE IDDQ programming in PMC during PLLM/PLLE
>> 	  clock registration which happen in clock_init prior to Tegra PMC
>> 	  probe.
>> 	  Moving PLLM/PLLE clocks registration to happen after Tegra PMC
>> 	  impacts other clocks EMC, MC and corresponding tegra_emc_init and
>> 	  tegra_mc_init.
>> 	  This implementation of configuring PMC registers thru helper
>> 	  functions in clock driver needs proper changes across PMC, Clock,
>> 	  EMC and MC inits to have it work across all Tegra platforms.
>>
>> 	  Currently PLLM Override is not enabled in the bootloader so proper
>> 	  patches for this fix will be taken care separately.
>>
>> [v1]:	v1 includes patches for below fixes.
>> 	- adding clk_out_1, clk_out_2, clk_out_3, blink controls to Tegra PMC
>> 	  driver and removing clk-tegra-pmc.
>> 	- updated clock provider from tegra_car to pmc in the device tree
>> 	  tegra210-smaug.dts that uses clk_out_2.
>> 	- Added helper functions in PMC driver for WB0 PLLM overrides and PLLE
>> 	  IDDQ programming to use by clock driver and updated clock driver to
>> 	  use these helper functions and removed direct PMC access from clock
>> 	  driver and all pmc base address references in clock driver.
>>
>>
>>
>>
>> Sowjanya Komatineni (19):
>>    dt-bindings: clock: tegra: Change CLK_M_DIV to OSC_DIV clocks
>>    clk: tegra: Change CLK_M_DIV clocks to OSC_DIV clocks
>>    clk: tegra: Fix Tegra PMC clock out parents
>>    dt-bindings: tegra: Convert Tegra PMC bindings to YAML
>>    dt-bindings: soc: tegra-pmc: Add Tegra PMC clock bindings
>>    soc: tegra: Add Tegra PMC clocks registration into PMC driver
>>    dt-bindings: soc: tegra-pmc: Add id for Tegra PMC 32KHz blink clock
>>    soc: tegra: Add support for 32KHz blink clock
>>    clk: tegra: Remove tegra_pmc_clk_init along with clk ids
>>    dt-bindings: clock: tegra: Remove pmc clock ids from clock dt-bindings
>>    ASoC: tegra: Use device managed resource APIs to get the clock
>>    ASoC: tegra: Add audio mclk configuration
>>    ASoC: tegra: Add fallback implementation for audio mclk
>>    clk: tegra: Remove audio related clock enables from init_table
>>    ARM: dts: tegra: Add clock-cells property to pmc
>>    arm64: tegra: Add clock-cells property to Tegra PMC node
>>    ARM: tegra: Update sound node clocks in device tree
>>    arm64: tegra: smaug: Change clk_out_2 provider to pmc
>>    ASoC: nau8825: change Tegra clk_out_2 provider from tegra_car to pmc
>>
>>   .../bindings/arm/tegra/nvidia,tegra20-pmc.txt      | 300 -----------------
>>   .../bindings/arm/tegra/nvidia,tegra20-pmc.yaml     | 354 +++++++++++++++++++++
>>   .../devicetree/bindings/sound/nau8825.txt          |   2 +-
>>   arch/arm/boot/dts/tegra114-dalmore.dts             |   8 +-
>>   arch/arm/boot/dts/tegra114.dtsi                    |   4 +-
>>   arch/arm/boot/dts/tegra124-apalis-v1.2.dtsi        |   8 +-
>>   arch/arm/boot/dts/tegra124-apalis.dtsi             |   8 +-
>>   arch/arm/boot/dts/tegra124-jetson-tk1.dts          |   8 +-
>>   arch/arm/boot/dts/tegra124-nyan.dtsi               |   8 +-
>>   arch/arm/boot/dts/tegra124-venice2.dts             |   8 +-
>>   arch/arm/boot/dts/tegra124.dtsi                    |   4 +-
>>   arch/arm/boot/dts/tegra20.dtsi                     |   4 +-
>>   arch/arm/boot/dts/tegra30-apalis-v1.1.dtsi         |   8 +-
>>   arch/arm/boot/dts/tegra30-apalis.dtsi              |   8 +-
>>   arch/arm/boot/dts/tegra30-beaver.dts               |   8 +-
>>   arch/arm/boot/dts/tegra30-cardhu.dtsi              |   8 +-
>>   arch/arm/boot/dts/tegra30-colibri.dtsi             |   8 +-
>>   arch/arm/boot/dts/tegra30.dtsi                     |   4 +-
>>   arch/arm64/boot/dts/nvidia/tegra132.dtsi           |   4 +-
>>   arch/arm64/boot/dts/nvidia/tegra210-smaug.dts      |   2 +-
>>   arch/arm64/boot/dts/nvidia/tegra210.dtsi           |   6 +-
>>   drivers/clk/tegra/Makefile                         |   1 -
>>   drivers/clk/tegra/clk-id.h                         |  11 +-
>>   drivers/clk/tegra/clk-tegra-fixed.c                |  32 +-
>>   drivers/clk/tegra/clk-tegra-pmc.c                  | 122 -------
>>   drivers/clk/tegra/clk-tegra114.c                   |  41 +--
>>   drivers/clk/tegra/clk-tegra124.c                   |  46 +--
>>   drivers/clk/tegra/clk-tegra20.c                    |   9 +-
>>   drivers/clk/tegra/clk-tegra210.c                   |  30 +-
>>   drivers/clk/tegra/clk-tegra30.c                    |  31 +-
>>   drivers/clk/tegra/clk.h                            |   1 -
>>   drivers/soc/tegra/pmc.c                            | 352 ++++++++++++++++++++
>>   include/dt-bindings/clock/tegra114-car.h           |  18 +-
>>   include/dt-bindings/clock/tegra124-car-common.h    |  18 +-
>>   include/dt-bindings/clock/tegra20-car.h            |   2 +-
>>   include/dt-bindings/clock/tegra210-car.h           |  18 +-
>>   include/dt-bindings/clock/tegra30-car.h            |  18 +-
>>   include/dt-bindings/soc/tegra-pmc.h                |  16 +
>>   sound/soc/tegra/tegra_alc5632.c                    |  28 +-
>>   sound/soc/tegra/tegra_asoc_utils.c                 | 125 ++++----
>>   sound/soc/tegra/tegra_asoc_utils.h                 |   3 +-
>>   sound/soc/tegra/tegra_max98090.c                   |  43 ++-
>>   sound/soc/tegra/tegra_rt5640.c                     |  43 ++-
>>   sound/soc/tegra/tegra_rt5677.c                     |  28 +-
>>   sound/soc/tegra/tegra_sgtl5000.c                   |  28 +-
>>   sound/soc/tegra/tegra_wm8753.c                     |  43 ++-
>>   sound/soc/tegra/tegra_wm8903.c                     |  43 ++-
>>   sound/soc/tegra/tegra_wm9712.c                     |   8 +-
>>   sound/soc/tegra/trimslice.c                        |  39 ++-
>>   49 files changed, 1192 insertions(+), 777 deletions(-)
>>   delete mode 100644 Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
>>   create mode 100644 Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.yaml
>>   delete mode 100644 drivers/clk/tegra/clk-tegra-pmc.c
>>   create mode 100644 include/dt-bindings/soc/tegra-pmc.h
>>
>> -- 
>> 2.7.4
>>