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Subject: Re: [PATCH 03/16] dt-bindings: spi: Add spi peripheral specific
 property
To:     Mark Brown <broonie@kernel.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Linux SPI List <linux-spi@vger.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>,
        anand.gore@broadcom.com, tomer.yacoby@broadcom.com,
        dan.beygelman@broadcom.com, joel.peshkin@broadcom.com,
        f.fainelli@gmail.com, jonas.gorski@gmail.com,
        kursad.oney@broadcom.com, dregan@mail.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230106200809.330769-1-william.zhang@broadcom.com>
 <20230106200809.330769-4-william.zhang@broadcom.com>
 <Y7iPS48viBg0QRok@sirena.org.uk>
 <3ff9a7fa-25dd-701c-078e-03e47bd3c08b@broadcom.com>
 <CAL_JsqJ7kr-6xs53NYJufem=wXnXVRnj3-1t1rG+W6g09kJ3ew@mail.gmail.com>
 <6720e3a4-dbbb-f490-98db-511a52b9a2ab@broadcom.com>
 <Y7xosoZMJEwRi1ok@sirena.org.uk>
From:   William Zhang <william.zhang@broadcom.com>
Message-ID: <f55ab390-a784-d598-8d0e-b78040fdbb73@broadcom.com>
Date:   Mon, 9 Jan 2023 12:18:09 -0800
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Hi Mark,

On 01/09/2023 11:19 AM, Mark Brown wrote:
> On Mon, Jan 09, 2023 at 12:06:13AM -0800, William Zhang wrote:
>>> On Fri, Jan 6, 2023 at 9:27 PM William Zhang <william.zhang@broadcom.com> wrote:
> 
>>> Keeping the clock on or not would affect all devices unless you have a
>>> per device clock you can gate, so making this a per device flag
>>> doesn't make sense.
> 
>> This applies only to each chip select. There is only one device under each
>> chip select.  So won't impact any other devices under other cs.
> 
> I don't understand how this would work - usually a SPI controller has a
> single set of clock, MOSI and MISO lines with the only per device thing
> being the chip select.  If the clock line is used by all devices then it
> must be kept on for all of them if it's to be kept on for one of them.
> 

This setting is set per spi message for particular chip select of the 
device when starting the message through bcm63xx_hsspi_set_clk function 
and restore to default(clock gating) when message is done through 
bcm63xx_hsspi_restore_clk_gate.

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