linux-kernel - Re: [PATCH v5 00/12] Support for AM33xx PWM Subsystem

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Date:	Wed, 28 Nov 2012 15:21:01 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	"Philip, Avinash" <avinashphilip@...com>
Cc:	paul@...an.com, tony@...mide.com, linux@....linux.org.uk,
	b-cousson@...com, hvaibhav@...com, anilkumar@...com,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, nsekhar@...com,
	gururaja.hebbar@...com, vaibhav.bedia@...com
Subject: Re: [PATCH v5 00/12] Support for AM33xx PWM Subsystem

On Tue, Nov 27, 2012 at 02:18:05PM +0530, Philip, Avinash wrote:
> In AM33xx PWM sub modules like ECAP, EHRPWM & EQEP are  integrated to
> PWM subsystem. All these submodules shares the resources (clock) & has
> a clock gating register in PWM Subsystem. This patch series creates a
> parent PWM Subsystem driver to handle access synchronization of shared
> resources & clock gating from PWM Subsystem configuration space.
> Also Device tree nodes populated to support parent child relation
> between PWMSS, ECAP & EHRPWM submodules.
> In addition EHRPWM module requires explicit clock gating from control
> module & is handled by patch #6 & 7.
> 
> As suggested by  Thierry for handling clock gating for PWM submodules
> should handle with a global function. This requires config space
> handling done independent from driver and is done at parent driver.
> 
> So the parent<->child relation adopted to handle
> 1. pm runtime synchronization
> 2. PWM subsystem common config space clock gating for PWM submodules.
> 
> Patches supports
> - Driver support for parent child relation handled patch #1
> - HWMOD data correction in EPWMSS at patch #2
> - Parent child in HWMOD relation handled at patch #3
> - Optional EHRPWM tb clock in patch #6
> - Support for TBCLK clock gating at patch #7.
> - Device tree binding support handled in patch #4,8 
> - Pinctrl support in patch #5 & 9.
> - DT node populated in patch #10 ,11 & 12.
> 
> This patch series based on omap_dt/for_3.8/dts_part2 and tested
> on am335x-evm & am335x-evmsk.
> 
> This patch series will come under 3 subsystem basically. But sent
> it in single patch series to have a clearer picture of why the
> OMAP subsystem changes required.
> 
> Patches come under PWM (1,4,5,7,8,9)
> Patches come under OMAP (2,3,6)
> Patches come under DT (10,11,12).
> 
> It depends on [1]
> 1. https://gitorious.org/linux-pwm/linux-pwm/commit/83af24027b3df1af5c5a9aa9adcdcfeb3429d3be
> pwm: Device tree support for PWM polarity
> 
> Changes since v3:
> 	- Rebased on top of omap_dt/for_3.8/dts_part2
> 	- Add pwm backlight for am335xevm_sk
> 	- Moved tipwmss.h to pwm-tipwmss.h
> 
> Philip, Avinash (12):
>   PWMSS: Add PWM Subsystem driver for parent<->child relationship
>   ARM: OMAP: AM33xx hwmod: Corrects PWM subsystem HWMOD entries
>   ARM: OMAP: AM33xx hwmod: Add parent-child relationship for PWM
>     subsystem
>   pwm: tiecap: Add device-tree binding
>   pwm: pwm-tiecap: pinctrl support
>   ARM: AM33XX: clk: Add clock node for EHRPWM TBCLK
>   pwm: pwm-tiehrpwm: Adding TBCLK gating support.
>   pwm: tiehrpwm: Add device-tree binding
>   pwm: pwm-tiehrpwm: pinctrl support
>   ARM: dts: AM33XX: Add PWMSS device tree nodes
>   ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evm
>   ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evmsk

Patches 1, 4, 5, 7, 8 and 9 applied, with a minor fixup to the subject
line of patch 1. Thanks.

Thierry

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