linux-kernel - Re: [PATCH] gpio: gpio-pca953x, Add get

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Message-ID: <CAMpxmJUUp5whscqBX2CU9--4zrh_+LUQOwVt1yUpffJQdPftkw@mail.gmail.com>
Date:   Tue, 14 Apr 2020 16:18:50 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Paul Thomas <pthomas8589@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: gpio-pca953x, Add get_multiple function

pon., 6 kwi 2020 o 18:53 Paul Thomas <pthomas8589@...il.com> napisał(a):
>
> Implement a get_multiple function for gpio-pca953x. If a driver
> leaves get_multiple unimplemented then gpio_chip_get_multiple()
> in gpiolib.c takes care of it by calling chip->get() as needed.
> For i2c chips this is very inefficient. For example if you do an
> 8-bit read then instead of a single i2c transaction there are
> 8 transactions reading the same byte!
>
> This has been tested with max7312 chips on a 5.2 kernel.
>
> Signed-off-by: Paul Thomas <pthomas8589@...il.com>
> ---

Hi, this doesn't apply on top of current master. Can you rebase it on
top of v5.7-rc1 and resend?

Bart