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Date:   Mon, 4 Jun 2018 07:10:04 +0100
From:   Lee Jones <lee.jones@linaro.org>
To:     Fabrice Gasnier <fabrice.gasnier@st.com>
Cc:     alexandre.torgue@st.com, thierry.reding@gmail.com,
        benjamin.gaignard@linaro.org, robh+dt@kernel.org,
        mark.rutland@arm.com, linux@armlinux.org.uk,
        mcoquelin.stm32@gmail.com, benjamin.gaignard@st.com,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org
Subject: Re: [RESEND PATCH v5 2/6] mfd: stm32-timers: add support for dmas
Message-ID: <20180604061004.GA25455@dell>
References: <1526456161-27865-1-git-send-email-fabrice.gasnier@st.com>
 <1526456161-27865-3-git-send-email-fabrice.gasnier@st.com>
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On Wed, 16 May 2018, Fabrice Gasnier wrote:

> STM32 Timers can support up to 7 DMA requests:
> - 4 channels, update, compare and trigger.
> Optionally request part, or all DMAs from stm32-timers MFD core.
> 
> Also add routine to implement burst reads using DMA from timer registers.
> This is exported. So, it can be used by child drivers, PWM capture
> for instance (but not limited to).
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
> ---
> Changes in v5:
> - fix warning on dma_mapping_error() that doesn't return an error code.
> - move stm32_timers_dma struct to header file as discussed with Lee.
>   This allows to remove alloc for this struct in stm32_timers_dma_probe.
> 
> Changes in v4:
> - Lee's comments: Add kerneldoc header, better format comments.
> 
> Changes in v3:
> - Basically Lee's comments:
> - rather create a struct stm32_timers_dma, and place a reference to it
>   in existing ddata (instead of adding priv struct).
> - rather use a struct device in exported routine prototype, and use
>   standard helpers instead of ddata. Get rid of to_stm32_timers_priv().
> - simplify error handling in probe (remove a goto)
> - comment on devm_of_platform_*populate() usage.
> 
> Changes in v2:
> - Abstract DMA handling from child driver: move it to MFD core
> - Add comments on optional dma support
> ---
>  drivers/mfd/stm32-timers.c       | 201 ++++++++++++++++++++++++++++++++++++++-
>  include/linux/mfd/stm32-timers.h |  46 +++++++++
>  2 files changed, 245 insertions(+), 2 deletions(-)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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