linux-kernel - Re: [PATCH v2 2/7] clk: bcm283x: add driver interfacing with Raspberry Pi's firmware

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Date:   Fri, 07 Jun 2019 11:42:34 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Stefan Wahren <wahrenst@....net>, stefan.wahren@...e.com,
        linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, f.fainelli@...il.com,
        ptesarik@...e.com, sboyd@...nel.org, viresh.kumar@...aro.org,
        mturquette@...libre.com, linux-pm@...r.kernel.org,
        rjw@...ysocki.net, eric@...olt.net,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        mbrugger@...e.de, ssuloev@...altech.com
Subject: Re: [PATCH v2 2/7] clk: bcm283x: add driver interfacing with
 Raspberry Pi's firmware

On Fri, 2019-06-07 at 11:26 +0200, Stefan Wahren wrote:
> Hi Nicolas,
> 
> Am 06.06.19 um 16:22 schrieb Nicolas Saenz Julienne:
> > Raspberry Pi's firmware offers an interface though which update it's
> > clock's frequencies. This is specially useful in order to change the CPU
> > clock (pllb_arm) which is 'owned' by the firmware and we're unable to
> > scale using the register interface provided by clk-bcm2835.
> > 
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > Acked-by: Eric Anholt <eric@...olt.net>
> > 
> > ---
> > 
> > Changes since v1:
> >   - Use BIT()
> >   - Add Kconfig entry, with compile test
> >   - remove prepare/unprepare
> >   - Fix uninitialized init.name in pllb registration
> >   - Add MODULE_ALIAS()
> >   - Use determine_rate() instead of round_rate()
> >   - Add small introduction explaining need for driver
> > 
> >  drivers/clk/bcm/Kconfig           |   7 +
> >  drivers/clk/bcm/Makefile          |   1 +
> >  drivers/clk/bcm/clk-raspberrypi.c | 302 ++++++++++++++++++++++++++++++
> >  3 files changed, 310 insertions(+)
> >  create mode 100644 drivers/clk/bcm/clk-raspberrypi.c
> > 
> > diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> > index 29ee7b776cd4..a4a2775d65e1 100644
> > --- a/drivers/clk/bcm/Kconfig
> > +++ b/drivers/clk/bcm/Kconfig
> > @@ -64,3 +64,10 @@ config CLK_BCM_SR
> >  	default ARCH_BCM_IPROC
> >  	help
> >  	  Enable common clock framework support for the Broadcom Stingray SoC
> > +
> > +config CLK_RASPBERRYPI
> > +	tristate "Raspberry Pi firmware based clock support"
> > +	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST &&
> > !RASPBERRYPI_FIRMWARE)
> > +	help
> > +	  Enable common clock framework support for Raspberry Pi's firmware
> > +	  dependent clocks
> > diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> > index 002661d39128..eb7159099d82 100644
> > --- a/drivers/clk/bcm/Makefile
> > +++ b/drivers/clk/bcm/Makefile
> > @@ -7,6 +7,7 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
> >  obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o
> > clk-iproc-asiu.o
> >  obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
> >  obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835-aux.o
> > +obj-$(CONFIG_CLK_RASPBERRYPI)	+= clk-raspberrypi.o
> >  obj-$(CONFIG_ARCH_BCM_53573)	+= clk-bcm53573-ilp.o
> >  obj-$(CONFIG_CLK_BCM_CYGNUS)	+= clk-cygnus.o
> >  obj-$(CONFIG_CLK_BCM_HR2)	+= clk-hr2.o
> 
> not your fault but you better rebase your next version on linux-next
> because Florian's latest patches ("clk: bcm: Make BCM2835 clock drivers
> selectable") collide with this patch.
> 
> Checkpatch gives the following output about this patch:
> 
> WARNING: 'harware' may be misspelled - perhaps 'hardware'?
> 
> #58: FILE: drivers/clk/bcm/clk-raspberrypi.c:5:
> + * Even though clk-bcm2835 provides an interface to the harware
> registers for
> 
> ERROR: code indent should use tabs where possible
> #197: FILE: drivers/clk/bcm/clk-raspberrypi.c:144:
> +^I^I^I^I           struct clk_rate_request *req)$

Noted, thanks.

As this seems fairly calm, should I send v3 or wait little more?


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