From: Mark Brown <broonie@kernel.org>
To: Keiji Hayashibara <hayashibara.keiji@socionext.com>
Cc: robh+dt@kernel.org, mark.rutland@arm.com,
yamada.masahiro@socionext.com, linux-spi@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
masami.hiramatsu@linaro.org, jaswinder.singh@linaro.org,
linux-kernel@vger.kernel.org,
Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Subject: Re: [PATCH 2/2] spi: add SPI controller driver for UniPhier SoC
Date: Thu, 19 Jul 2018 17:51:50 +0100 [thread overview]
Message-ID: <20180719165150.GI27938@sirena.org.uk> (raw)
In-Reply-To: <1531983117-9443-3-git-send-email-hayashibara.keiji@socionext.com>
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On Thu, Jul 19, 2018 at 03:51:57PM +0900, Keiji Hayashibara wrote:
This all looks good, just a small number of fairly minor things - mostly
style points.
> @@ -0,0 +1,532 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * spi-uniphier.c - Socionext UniPhier SPI controller driver
> + *
> + * Copyright 2012 Panasonic Corporation
> + * Copyright 2016-2018 Socionext Inc.
> + */
Please make the entire comment a C++ one, it makes things look a bit
more joined up/intentional.
> +#define BYTES_PER_WORD(x) \
> +({ \
> + int __x; \
> + __x = (x <= 8) ? 1 : \
> + (x <= 16) ? 2 : 4; \
> + __x; \
> +})
Could this be replaced with an inline function? The usage seems fine
but it's a bit big for a macro. The end result should be similar.
> +static irqreturn_t uniphier_spi_handler(int irq, void *dev_id)
> +{
> + struct uniphier_spi_priv *priv = dev_id;
> + u32 val, stat;
> +
> + stat = readl(priv->base + SSI_IS);
> + val = SSI_IC_TCIC | SSI_IC_RCIC | SSI_IC_RORIC;
> + writel(val, priv->base + SSI_IC);
> +
> + /* rx fifo overrun */
> + if (stat & SSI_IS_RORID) {
> + priv->error = -EIO;
> + goto done;
> + }
> +
> + /* rx complete */
> + if ((stat & SSI_IS_RCID) && (stat & SSI_IS_RXRS)) {
> + }
> +
> + return IRQ_HANDLED;
> +
> +done:
> + complete(&priv->xfer_done);
> + return IRQ_HANDLED;
This will unconditionally report IRQ_HANDLED even if none of the flags
were set by the hardware which will cause problems if something goes
wrong - the interrupt will continually be serviced and the interrupt
framework won't be able to mitigate or provide diagnostics. It's better
to return IRQ_NONE if nothing is detected from the hardware.
> +static const struct of_device_id uniphier_spi_match[] = {
> + { .compatible = "socionext,uniphier-scssi", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, uniphier_spi_match);
The binding document also listed socionext,uniphier-mcssi as a
compatible but this driver doesn't match that.
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next prev parent reply other threads:[~2018-07-19 16:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-19 6:51 [PATCH 0/2] add SPI controller driver for UniPhier SoCs Keiji Hayashibara
2018-07-19 6:51 ` [PATCH 1/2] dt-bindings: spi: add DT bindings for UniPhier SPI controller Keiji Hayashibara
2018-07-25 19:17 ` Rob Herring
2018-07-19 6:51 ` [PATCH 2/2] spi: add SPI controller driver for UniPhier SoC Keiji Hayashibara
2018-07-19 16:51 ` Mark Brown [this message]
2018-07-20 0:33 ` Keiji Hayashibara
2018-07-19 19:45 ` Trent Piepho
2018-07-20 2:20 ` Keiji Hayashibara
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