From: Lee Jones <lee.jones@linaro.org>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
linux-kernel@vger.kernel.org, "Rob Herring" <robh+dt@kernel.org>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Alessandro Zummo" <a.zummo@towertech.it>,
"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
"Shawn Guo" <shawnguo@kernel.org>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Fabio Estevam" <festevam@gmail.com>,
"NXP Linux Team" <linux-imx@nxp.com>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Heiko Stuebner" <heiko.stuebner@theobroma-systems.com>,
"Stephan Gerhold" <stephan@gerhold.net>,
"Lubomir Rintel" <lkundrak@v3.sk>,
"Mark Brown" <broonie@kernel.org>, allen <allen.chen@ite.com.tw>,
"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
devicetree@vger.kernel.org, linux-pwm@vger.kernel.org,
linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"Heiko Stuebner" <heiko@sntech.de>,
"Josua Mayer" <josua.mayer@jm0.eu>,
"Andreas Kemnade" <andreas@kemnade.info>,
"Arnd Bergmann" <arnd@arndb.de>,
"Daniel Palmer" <daniel@0x0f.com>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>
Subject: Re: [PATCH v7 4/7] pwm: ntxec: Add driver for PWM function in Netronix EC
Date: Mon, 11 Jan 2021 16:42:28 +0000 [thread overview]
Message-ID: <20210111164228.GB3575260@dell> (raw)
In-Reply-To: <X/xKZI04ipiQCUjd@ulmo>
On Mon, 11 Jan 2021, Thierry Reding wrote:
> On Sat, Jan 09, 2021 at 07:02:17PM +0100, Jonathan Neuschäfer wrote:
> > The Netronix EC provides a PWM output which is used for the backlight
> > on some ebook readers. This patches adds a driver for the PWM output.
> >
> > The .get_state callback is not implemented, because the PWM state can't
> > be read back from the hardware.
> >
> > Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
> > ---
> > v7:
> > - no changes
> >
> > v6:
> > - https://lore.kernel.org/lkml/20201208011000.3060239-5-j.neuschaefer@gmx.net/
> > - Move period / duty cycle setting code to a function
> > - Rename pwmchip_to_priv to ntxec_pwm_from_chip
> > - Set period and duty cycle only before enabling the output
> > - Mention that duty=0, enable=1 is assumed not to happen
> > - Interleave writes to the period and duty cycle registers, to minimize the
> > window of time that an inconsistent state is configured
> >
> > v5:
> > - https://lore.kernel.org/lkml/20201201011513.1627028-5-j.neuschaefer@gmx.net/
> > - Avoid truncation of period and duty cycle to 32 bits
> > - Make ntxec_pwm_ops const
> > - Use regmap_multi_reg_write
> > - Add comment about get_state to ntxec_pwm_ops
> > - Add comments about non-atomicity of (period, duty cycle) update
> >
> > v4:
> > - https://lore.kernel.org/lkml/20201122222739.1455132-5-j.neuschaefer@gmx.net/
> > - Document hardware/driver limitations
> > - Only accept normal polarity
> > - Fix a typo ("zone" -> "zero")
> > - change MAX_PERIOD_NS to 0xffff * 125
> > - Clamp period to the maximum rather than returning an error
> > - Rename private struct pointer to priv
> > - Rearrage control flow in _probe to save a few lines and a temporary variable
> > - Add missing MODULE_ALIAS line
> > - Spell out ODM
> >
> > v3:
> > - https://lore.kernel.org/lkml/20200924192455.2484005-5-j.neuschaefer@gmx.net/
> > - Relicense as GPLv2 or later
> > - Add email address to copyright line
> > - Remove OF compatible string and don't include linux/of_device.h
> > - Fix bogus ?: in return line
> > - Don't use a comma after sentinels
> > - Avoid ret |= ... pattern
> > - Move 8-bit register conversion to ntxec.h
> >
> > v2:
> > - https://lore.kernel.org/lkml/20200905133230.1014581-6-j.neuschaefer@gmx.net/
> > - Various grammar and style improvements, as suggested by Uwe Kleine-König,
> > Lee Jones, and Alexandre Belloni
> > - Switch to regmap
> > - Prefix registers with NTXEC_REG_
> > - Add help text to the Kconfig option
> > - Use the .apply callback instead of the old API
> > - Add a #define for the time base (125ns)
> > - Don't change device state in .probe; this avoids multiple problems
> > - Rework division and overflow check logic to perform divisions in 32 bits
> > - Avoid setting duty cycle to zero, to work around a hardware quirk
> > ---
> > drivers/pwm/Kconfig | 8 ++
> > drivers/pwm/Makefile | 1 +
> > drivers/pwm/pwm-ntxec.c | 182 ++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 191 insertions(+)
> > create mode 100644 drivers/pwm/pwm-ntxec.c
>
> Lee, I assume you'll want to pick the whole set up into the MFD tree? If
> so:
Yes, I'll pick this up once we have all the Acks.
The Arm parts usually go in separately.
> Acked-by: Thierry Reding <thierry.reding@gmail.com>
Thanks.
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2021-01-11 16:43 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-09 18:02 [PATCH v7 0/7] Netronix embedded controller driver for Kobo and Tolino ebook readers Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 1/7] dt-bindings: Add vendor prefix for Netronix, Inc Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 2/7] dt-bindings: mfd: Add binding for Netronix embedded controller Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 3/7] mfd: Add base driver " Jonathan Neuschäfer
2021-01-12 19:36 ` Andreas Kemnade
2021-01-13 8:03 ` Lee Jones
2021-01-14 18:56 ` Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 4/7] pwm: ntxec: Add driver for PWM function in Netronix EC Jonathan Neuschäfer
2021-01-11 9:13 ` Uwe Kleine-König
2021-01-11 12:53 ` Thierry Reding
2021-01-11 16:42 ` Lee Jones [this message]
2021-01-12 19:39 ` Andreas Kemnade
2021-01-13 22:46 ` Andreas Kemnade
2021-01-14 22:31 ` Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 5/7] rtc: New driver for RTC in Netronix embedded controller Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 6/7] MAINTAINERS: Add entry for " Jonathan Neuschäfer
2021-01-09 18:02 ` [PATCH v7 7/7] ARM: dts: imx50-kobo-aura: Add " Jonathan Neuschäfer
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