linux-kernel - Re: [PATCH v3 00/13] ARM: at91: PMC driver rework

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Date:	Thu, 10 Dec 2015 18:06:52 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 00/13] ARM: at91: PMC driver rework

On Fri,  4 Dec 2015 18:03:35 +0100
Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:

> Hi,
> 
> This patch set is a cleanup that properly separate drivers needing to access the
> PMC (PM and USB) from the clock driver by exposing the PMC as a syscon.
> 
> This also allows to implement a fix for preempt-rt. Currently, at91 platform are
> crashing when using preempt-rt because the irq handler are transformed in
> threaded irq handler but at the time the pmc registers its clocks, it is not
> possible to creat threads, leading to a NULL pointer dereference in the kernel.
> 
> The new infrastructure uses polling until it is late enough to register threaded
> irqs.
> 
> Note that there is an ugly global spinlock for the peripheral and generated
> clocks. More infrastructure is needed in syscon to get rid of that one. We will
> be working on that.

To the whole series,

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> 
> Changes in v3:
>  - rebased on v4.4-rc1 and so included the sama5d2 and the generated clocks
>  - fixed comments from Wenyou
> 
> Alexandre Belloni (10):
>   clk: at91: clk-main: factorize irq handling
>   clk: at91: make IRQ optional and register them later
>   clk: at91: pmc: merge at91_pmc_init in atmel_pmc_probe
>   clk: at91: pmc: move pmc structures to C file
>   ARM: at91: pm: simply call at91_pm_init
>   ARM: at91: pm: find and remap the pmc
>   ARM: at91: pm: move idle functions to pm.c
>   ARM: at91: remove useless includes and function prototypes
>   usb: gadget: atmel: access the PMC using regmap
>   clk: at91: pmc: drop at91_pmc_base
> 
> Boris Brezillon (3):
>   clk: at91: make use of syscon to share PMC registers in several
>     drivers
>   clk: at91: make use of syscon/regmap internally
>   clk: at91: only disable available IRQs
> 
>  arch/arm/mach-at91/Kconfig              |   1 +
>  arch/arm/mach-at91/at91rm9200.c         |   2 -
>  arch/arm/mach-at91/at91sam9.c           |   2 -
>  arch/arm/mach-at91/generic.h            |  13 +-
>  arch/arm/mach-at91/pm.c                 |  70 +++++-
>  arch/arm/mach-at91/sama5.c              |   2 +-
>  drivers/clk/at91/clk-generated.c        |  95 ++++---
>  drivers/clk/at91/clk-h32mx.c            |  32 ++-
>  drivers/clk/at91/clk-main.c             | 430 ++++++++++++++++++--------------
>  drivers/clk/at91/clk-master.c           | 134 ++++++----
>  drivers/clk/at91/clk-peripheral.c       | 135 +++++-----
>  drivers/clk/at91/clk-pll.c              | 190 +++++++++-----
>  drivers/clk/at91/clk-plldiv.c           |  42 ++--
>  drivers/clk/at91/clk-programmable.c     |  92 ++++---
>  drivers/clk/at91/clk-slow.c             |  27 +-
>  drivers/clk/at91/clk-smd.c              |  54 ++--
>  drivers/clk/at91/clk-system.c           | 129 +++++++---
>  drivers/clk/at91/clk-usb.c              | 121 +++++----
>  drivers/clk/at91/clk-utmi.c             | 116 ++++++---
>  drivers/clk/at91/pmc.c                  | 314 +++++------------------
>  drivers/clk/at91/pmc.h                  |  96 +------
>  drivers/usb/gadget/udc/atmel_usba_udc.c |  20 +-
>  drivers/usb/gadget/udc/atmel_usba_udc.h |   2 +
>  include/linux/clk/at91_pmc.h            |  12 -
>  24 files changed, 1111 insertions(+), 1020 deletions(-)
> 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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