linux-kernel - Re: [PATCH v4 3/5] iio: pressure: bmp280: Fix alignment for DMA safety

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Message-ID: <CAHp75VfwhUEdpkRKNme_rVn=bxEgV+p+RK4G961oVnikB35vCA@mail.gmail.com>
Date:   Mon, 25 Jul 2022 23:08:47 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Angel Iglesias <ang.iglesiasg@...il.com>
Cc:     linux-iio <linux-iio@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Cercueil <paul@...pouillou.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/5] iio: pressure: bmp280: Fix alignment for DMA safety

On Sat, Jul 23, 2022 at 7:40 PM Angel Iglesias <ang.iglesiasg@...il.com> wrote:
>
> Adds a DMA-safe buffer to driver data struct to store raw data from sensor
>
> Updated calibration read functions to use DMA-safe buffers as well.
> In this case, as calibration data is only read at sensor initialization,
> the buffers are allocated with kmalloc and freed after being processed.

> Suggested-by: Jonathan Cameron <jic23@...nel.org>

Jonathan, maybe it's easier to fix in regmap once for all (something
like a new flag there dma_safe)? Also a side note: i2c doesn't need
that, since it has its own implementation.

P.S. Use sizeof() in regmap calls where it's appropriate.

-- 
With Best Regards,
Andy Shevchenko