linux-kernel - Re: [PATCH 29/30] dt-bindings: spi: dw: Add Baikal-T1 SPI Controllers

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Date:   Tue, 29 Sep 2020 11:58:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Lars Povlsen <lars.povlsen@...rochip.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        "wuxu . wu" <wuxu.wu@...wei.com>, Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Serge Semin <fancer.lancer@...il.com>,
        devicetree@...r.kernel.org,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        linux-spi@...r.kernel.org, Feng Tang <feng.tang@...el.com>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 29/30] dt-bindings: spi: dw: Add Baikal-T1 SPI Controllers

On Sun, 20 Sep 2020 14:29:13 +0300, Serge Semin wrote:
> These controllers are based on the DW APB SSI IP-core and embedded into
> the SoC, so two of them are equipped with IRQ, DMA, 64 words FIFOs and 4
> native CS, while another one as being utilized by the Baikal-T1 System
> Boot Controller has got a very limited resources: no IRQ, no DMA, only a
> single native chip-select and just 8 bytes Tx/Rx FIFOs available. That's
> why we have to mark the IRQ to be optional for the later interface.
> 
> The SPI controller embedded into the Baikal-T1 System Boot Controller can
> be also used to directly access an external SPI flash by means of a
> dedicated FSM. The corresponding MMIO region availability is switchable by
> the embedded multiplexor, which phandle can be specified in the dts node.
> 
> * We added a new example to test out the non-standard Baikal-T1 System
> Boot SPI Controller DT binding.
> 
> Co-developed-by: Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>
> Signed-off-by: Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  .../bindings/spi/snps,dw-apb-ssi.yaml         | 33 +++++++++++++++++--
>  1 file changed, 31 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>