linux-kernel - Re: [PATCH v1] meson saradc: fix clock divider mask length

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Message-ID: <f0966e95-43c7-e6f6-8aeb-05f27691cec3@sberdevices.ru>
Date:   Wed, 17 May 2023 16:47:59 +0000
From:   Старк Георгий Николаевич <GNStark@...rdevices.ru>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
        "khilman@...libre.com" <khilman@...libre.com>,
        "jbrunet@...libre.com" <jbrunet@...libre.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "nuno.sa@...log.com" <nuno.sa@...log.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH v1] meson saradc: fix clock divider mask length

On 5/16/23 22:08, Martin Blumenstingl wrote:
> Hi George,
>
> thank you for this patch!
>
> On Mon, May 15, 2023 at 11:06 PM George Stark <gnstark@...rdevices.ru> wrote:
>> From: George Stark <GNStark@...rdevices.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.

Hello Martin

I've checked datasheets of all chips listed in meson_sar_adc_of_match array in meson_saradc.c and everywhere this field is 6 bits long. According to driver code and existing dts files this patch affects all supported chips except meson8.

Best regards
George


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