linux-kernel - Re: [PATCH v9 2/3] fpga manager: Add cyclone-ps-spi driver for Altera FPGAs

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Date:   Wed, 15 Feb 2017 16:26:41 +0100
From:   Anatolij Gustschin <agust@...x.de>
To:     Joshua Clayton <stillcompiling@...il.com>
Cc:     Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v9 2/3] fpga manager: Add cyclone-ps-spi driver for
 Altera FPGAs

Hi Joshua,

On Tue, 24 Jan 2017 14:19:33 -0800
Joshua Clayton stillcompiling@...il.com wrote:
...
>+static int cyclonespi_write(struct fpga_manager *mgr, const char *buf,
>+			    size_t count)
>+{
>+	struct cyclonespi_conf *conf = (struct cyclonespi_conf *)mgr->priv;
>+	const char *fw_data = buf;
>+	const char *fw_data_end = fw_data + count;
>+
>+	while (fw_data < fw_data_end) {
>+		int ret;
>+		size_t stride = min(fw_data_end - fw_data, SZ_4K);
>+
>+		rev_buf(fw_data, stride);

Can we make rev_buf() optional here? I've tested this driver with
Stratix-V FPGA using orion_spi driver. It works without swapping
the data.

Thanks,
Anatolij