linux-kernel - Re: [RESEND PATCH v5 2/6] mfd: stm32-timers: add support for dmas

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Date:   Mon, 4 Jun 2018 07:10:04 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     alexandre.torgue@...com, thierry.reding@...il.com,
        benjamin.gaignard@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, linux@...linux.org.uk,
        mcoquelin.stm32@...il.com, benjamin.gaignard@...com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [RESEND PATCH v5 2/6] mfd: stm32-timers: add support for dmas

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@...com>
> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...aro.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@...aro.org>

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