linux-kernel - Re: [PATCH] spi: Add FSI-attached SPI controller driver

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Message-ID: <20200130144609.GD6682@sirena.org.uk>
Date:   Thu, 30 Jan 2020 14:46:09 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        joel@....id.au, andrew@...id.au
Subject: Re: [PATCH] spi: Add FSI-attached SPI controller driver

On Wed, Jan 29, 2020 at 02:08:24PM -0600, Eddie James wrote:

Overall this looks good, some comments below but they're all fairly
minor.

> +++ b/drivers/spi/spi-fsi.c
> @@ -0,0 +1,547 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) IBM Corporation 2020
> + */

Please make the entire comment a C++ one so things look more
intentional.

> +
> +static int fsi_spi_data_in(u64 in, u8 *rx, int len)
> +{
> +	int i;
> +	int num_bytes = len > 8 ? 8 : len;

Please write normal conditional statements to improve legibility, the
ternery operator isn't really needed here.

> +static int fsi_spi_reset(struct fsi_spi *ctx)
> +{
> +	int rc;
> +
> +	dev_info(ctx->dev, "Resetting SPI controller.\n");

This should be lowered to dev_dbg() at most, it's not really adding
anything otherwise.

> +static int fsi_spi_remove(struct device *dev)
> +{
> +	return 0;
> +}

Remove empty functions, if they can safely be empty then it should be
possible to omit them.

> +static const struct fsi_device_id fsi_spi_ids[] = {
> +	{ FSI_ENGID_SPI, FSI_VERSION_ANY },
> +	{ }
> +};

This needs a MODULE_DEVICE_TABLE annotation.

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