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Date:   Wed, 17 May 2023 12:21:00 +0300
From:   Dmitry Rokosov <ddrokosov@sberdevices.ru>
To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>
CC:     George Stark <gnstark@sberdevices.ru>, <jic23@kernel.org>,
        <lars@metafoo.de>, <neil.armstrong@linaro.org>,
        <khilman@baylibre.com>, <jbrunet@baylibre.com>,
        <andy.shevchenko@gmail.com>, <nuno.sa@analog.com>,
        <linux-iio@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-amlogic@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <kernel@sberdevices.ru>
Subject: Re: [PATCH v1] meson saradc: fix clock divider mask length
Message-ID: <20230517092100.wgnfuzdhgotlvv22@CAB-WSD-L081021>
References: <20230515210545.2100161-1-gnstark@sberdevices.ru>
 <CAFBinCCc+t7Ks6fqz38cVrufPRFdxFgC9Qp+JhcM1KfD6pupTg@mail.gmail.com>
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Hello Martin,

On Tue, May 16, 2023 at 09:08:26PM +0200, Martin Blumenstingl wrote:
> Hi George,
> 
> thank you for this patch!
> 
> On Mon, May 15, 2023 at 11:06 PM George Stark <gnstark@sberdevices.ru> wrote:
> >
> > From: George Stark <GNStark@sberdevices.ru>
> >
> > According to datasheets of supported meson SOCs
> > length of ADC_CLK_DIV field is 6 bits long
> I have a question about this sentence which doesn't affect this patch
> - it's only about managing expectations:
> Which SoC are you referring to?
> This divider is only relevant on older SoCs that predate GXBB (S905).
> To my knowledge all SoCs from GXBB onwards place the divider in the
> main or AO clock controller, so this bitmask is irrelevant there.
> 

We are currently working with the A1 SoC family, specifically the A113L
variant. According to the datasheet for the A113L, the ADC_CLK_DIV can
be found in the SAR_ADC_REG3 register as a 6-bit value located within
bits 15 through 10.

> > Fixes: 3adbf3427330 ("iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs")
> > Signed-off-by: George Stark <GNStark@sberdevices.ru>
> Since my question above doesn't affect this patch:
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

-- 
Thank you,
Dmitry