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arm: omap3: am35x: Convert emac to hwmod & disable hlt when open

Kevin Hilman linux-arm-kernel linux-omap 2 versions – New

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#Subject and filesSizeRepliesApplied
2/2arm: omap3: am35x: Disable hlt when using Davinci EMAC+0 -00 replies

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Cover letter [PATCH v2 0/2] arm: omap3: am35x: Convert emac to hwmod & disable hlt when open
Quoted 10 lines · Mark A. Greer

From: "Mark A. Greer" <[email protected]>

These patches convert the davinci emac support for the am35x SoC to use hwmod and add enable_hlt()/disable_hlt() calls to the pm_runtime hooks for that driver.

I have converted the davinci_emac driver to use pm_runtime but I can't formally submit it yet since it requires some changes on the mach-davinci side that haven't happened yet. I will send it as an RFC in a reply to this thread.

I haven't seen any patches for the davinci runtime PM support, so I thought I would do a quick patch to show how easy it is to use some generic PM core code to manage clocks in runtime PM.

The patch below implments this on davinci but has only been boot tested on my ancient dm6446 EVM. Combined with Mark's RFC patch to convert davinci_emac to runtime PM, it was working fine on dm6446 to enable the emac clocks.

Kevin

Quoted 1 line

From 7a90e650ad8542b7f85076b58703e94bdc058562 Mon Sep 17 00:00:00 2001

From: Kevin Hilman <[email protected]>
Date: Thu, 31 May 2012 09:59:53 -0700
Subject: [PATCH] ARM: davinci: add runtime PM support for clock management

Add runtime PM core support to davinci by using the pm_clk infrastructure of the PM core.

When runtime PM is enabled, the davinci runtime PM implementation will use the pm_clk layer to enable/disable clocks on demand. When runtime PM is disabled, the pm_clk core will automatically enable clocks when the driver is bound and disable clocks when the driver is unbound.

Cc Mark A. Greer <[email protected]>
Cc Sekhar Nori <nsekhar at ti.com
Signed-off-by Kevin Hilman <[email protected]>

---
Applies on v3.4

 arch/arm/mach-davinci/Makefile    |    1 +
 arch/arm/mach-davinci/pm_domain.c |   70 +++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 arch/arm/mach-davinci/pm_domain.c
arch/arm/mach-davinci/Makefile +1 -0
index 2db78bd..2227eff 100644
@@ -39,3 +39,4 @@ obj-$(CONFIG_MACH_OMAPL138_HAWKBOARD)	+= board-omapl138-hawk.o
 obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o
 obj-$(CONFIG_CPU_IDLE)			+= cpuidle.o
 obj-$(CONFIG_SUSPEND)			+= pm.o sleep.o
+obj-$(CONFIG_HAVE_CLK)			+= pm_domain.o
arch/arm/mach-davinci/pm_domain.c new file +70 -0

70 lines not on this page · raw message

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