linux-kernel - Re: [PATCH 2/2] spi: mediatek: add cs timing configuration support

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Message-ID: <20191119181930.GF3634@sirena.org.uk>
Date:   Tue, 19 Nov 2019 18:19:30 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Luhua Xu <luhua.xu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Allison Randal <allison@...utok.net>,
        Enrico Weigelt <info@...ux.net>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Leilk Liu <leilk.liu@...iatek.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] spi: mediatek: add cs timing configuration support

On Mon, Nov 18, 2019 at 12:57:17PM +0800, Luhua Xu wrote:
> Add configure SPI CS setup/hold/idle delays in terms
> of clk count support, and use one period of current
> spi speed as default if setup/hold/idle not indicated.

We have added a generic way to specify delays like this via the
set_cs_timing() operation and related fields in the spi_device struct
which operate in terms of spi_delay - Alexandru Ardelean added them
recently.  This supports both times and clock cycles as units so should
fit with what your hardware can do, the interface is new though so there
may be soem rough edges to worry about.

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