linux-kernel - Re: [PATCHv2] drivers: spi: Add qspi flash controller

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Message-ID: <51D2B220.1010501@ti.com>
Date:	Tue, 2 Jul 2013 16:27:36 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Sourav Poddar <sourav.poddar@...com>
CC:	<broonie@...nel.org>, <spi-devel-general@...ts.sourceforge.net>,
	<grant.likely@...aro.org>, <balbi@...com>, <rnayak@...com>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2] drivers: spi: Add qspi flash controller

On 7/2/2013 2:26 PM, Sourav Poddar wrote:
> The patch add basic support for the quad spi controller.
> 
> QSPI is a kind of spi module that allows single,
> dual and quad read access to external spi devices. The module
> has a memory mapped interface which provide direct interface
> for accessing data form external spi devices.
> 
> The patch will configure controller clocks, device control
> register and for defining low level transfer apis which
> will be used by the spi framework to transfer data to
> the slave spi device(flash in this case).
> 
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>
> ---
> This patch was sent as a part of a series[1];
> but this can go in as a standalone patch.
> [1]: https://lkml.org/lkml/2013/6/26/83
> 
> v1->v2:
> 1. Placed pm specific calls in prepare/unprepare apis.
> 2. Put a mask to support upto 32 bits word length.
> 3. Used "devm_ioremap_resource" variants.
> 4. Add dt binding doumentation.
>  Documentation/devicetree/bindings/spi/ti_qspi.txt |   22 ++
>  drivers/spi/Kconfig                               |    8 +
>  drivers/spi/Makefile                              |    1 +
>  drivers/spi/ti-qspi.c                             |  357 +++++++++++++++++++++
>  4 files changed, 388 insertions(+), 0 deletions(-)

>  create mode 100644 Documentation/devicetree/bindings/spi/ti_qspi.txt
>  create mode 100644 drivers/spi/ti-qspi.c

Please cc devicetree-discuss list when adding new bindings.

> +static int dra7xxx_qspi_probe(struct platform_device *pdev)
> +{
> +	struct  dra7xxx_qspi *qspi;
> +	struct spi_master *master;
> +	struct resource         *r;
> +	struct device_node *np = pdev->dev.of_node;
> +	u32 max_freq;
> +	int ret;
> +
> +	master = spi_alloc_master(&pdev->dev, sizeof(*qspi));
> +	if (!master)
> +		return -ENOMEM;
> +
> +	master->mode_bits = SPI_CPOL | SPI_CPHA;
> +
> +	master->num_chipselect = 1;
> +	master->bus_num = -1;
> +	master->setup = dra7xxx_qspi_setup;
> +	master->prepare_transfer_hardware = dra7xxx_qspi_prepare_xfer;
> +	master->transfer_one_message = dra7xxx_qspi_start_transfer_one;
> +	master->unprepare_transfer_hardware = dra7xxx_qspi_unprepare_xfer;
> +	master->dev.of_node = pdev->dev.of_node;
> +	master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1);
> +
> +	dev_set_drvdata(&pdev->dev, master);
> +
> +	qspi = spi_master_get_devdata(master);
> +	qspi->master = master;
> +	qspi->dev = &pdev->dev;
> +
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (r == NULL) {
> +		ret = -ENODEV;
> +		goto free_master;
> +	}
> +
> +	qspi->base = devm_ioremap_resource(&pdev->dev, r);

> +	if (!qspi->base) {
> +		dev_dbg(&pdev->dev, "can't ioremap MCSPI\n");
> +		ret = -ENOMEM;
> +		goto free_master;
> +	}

This should be

	if (IS_ERR(qspi->base)) {
		dev_dbg(&pdev->dev, "can't ioremap QSPI\n");
		ret = PTR_ERR(qspi->base);
		goto free_master;
	}

Thanks,
Sekhar
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