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Date:   Fri, 29 Jul 2022 14:41:44 +0200
From:   Daniel =?iso-8859-1?Q?Gl=F6ckner?= <dg@emlix.com>
To:     Ivan Bornyakov <i.bornyakov@metrotek.ru>
Cc:     mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com,
        trix@redhat.com, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, linux-fpga@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        system@metrotek.ru
Subject: Re: [PATCH v5 1/2] fpga: ecp5-spi: add Lattice ECP5 FPGA manager
Message-ID: <20220729124143.GA31715@homes.emlix.com>
References: <20220719112335.9528-1-i.bornyakov@metrotek.ru>
 <20220719112335.9528-2-i.bornyakov@metrotek.ru>
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Hi,

On Tue, Jul 19, 2022 at 02:23:34PM +0300, Ivan Bornyakov wrote:
> +	struct spi_transfer lsc_xfers[] = {
> +		{
> +			.tx_buf = lsc_init_addr,
> +			.len = sizeof(lsc_init_addr),
> +			.cs_change = 1,
> +		}, {
> +			.tx_buf = lsc_bitstream_burst,
> +			.len = sizeof(lsc_bitstream_burst),
> +			.cs_change = 1,
> +		},
> +	};

cs_change in the last transfer of a message will not prevent transfers
with other spi devices on the bus from taking place. You want to use
spi_bus_lock and friends in addition.

Best regards,

  Daniel