From: Grant Likely <grant.likely@secretlab.ca>
To: Erik Gilling <konkers@android.com>
Cc: linux-tegra@vger.kernel.org,
spi-devel-general@lists.sourceforge.net,
Thierry Reding <thierry.reding@avionic-design.de>,
Russell King <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4] spi: add spi_tegra driver
Date: Thu, 2 Sep 2010 08:22:49 -0600 [thread overview]
Message-ID: <AANLkTimonLa1mUVSHR=QnR48HPtAZ5BW3BsVsg7MWALy@mail.gmail.com> (raw)
In-Reply-To: <1283379393-14831-1-git-send-email-konkers@android.com>
On Wed, Sep 1, 2010 at 4:16 PM, Erik Gilling <konkers@android.com> wrote:
> v2 changes:
> from Thierry Reding:
> * add "select TEGRA_SYSTEM_DMA" to Kconfig
> from Grant Likely:
> * add oneline description to header
> * inline references to DRIVER_NAME
> * inline references to BUSY_TIMEOUT
> * open coded bytes_per_word()
> * spi_readl/writel -> spi_tegra_readl/writel
> * move transfer validation to spi_tegra_transfer
> * don't request_mem_region iomem as platform bus does that for us
> * __exit -> __devexit
>
> v3 changes:
> from Russell King:
> * put request_mem_region back int
> from Grant Likely:
> * remove #undef DEBUG
> * add SLINK_ to register bit defines
> * remove unused bytes_per_word
> * make spi_tegra_readl/writel static linine
> * various refactoring for clarity
> * mark err if BSY bit is not cleared after 1000 retries
> * move spinlock to protect setting of RDY bit
> * subsys_initcall -> module_init
>
> v3 changes:
> from Grant Likely:
> * update spi_tegra to use PTR_ERRless dma API
>
> Signed-off-by: Erik Gilling <konkers@android.com>
> Cc: Thierry Reding <thierry.reding@avionic-design.de>
> Cc: Grant Likely <grant.likely@secretlab.ca>
> Cc: Russell King <linux@arm.linux.org.uk>
Hi Erik,
Go ahead and add my Acked-by line and merge this via the tegra tree to
avoid ordering issues. I also have a few more minor comments below.
g.
> + /* FIXME: should probably control CS manually so that we can be sure
> + * it does not go low between transfer and to support delay_usecs
> + * correctly.
> + */
Yes, you'll probably want to revisit this. A lot of SPI hardware
doesn't understand that the actual transfer may be longer that the
data it immediately knows about. Also, it is common to use GPIOs as
chip selects.
> +static void spi_tegra_cleanup(struct spi_device *spi)
> +{
> + dev_dbg(&spi->dev, "cleanup\n");
> +}
Remove the empty hook
> +static int __init spi_tegra_probe(struct platform_device *pdev)
> +{
> + struct spi_master *master;
> + struct spi_tegra_data *tspi;
> + struct resource *r;
> + int ret;
> +
> + master = spi_alloc_master(&pdev->dev, sizeof *tspi);
> + if (master == NULL) {
> + dev_err(&pdev->dev, "master allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + /* the spi->mode bits understood by this driver: */
> + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
> +
> + if (pdev->id != -1)
> + master->bus_num = pdev->id;
even if pdev->id is -1, you probably want to set master->bus_num to is
so that a spi bus number can be dynamically assigned.
next prev parent reply other threads:[~2010-09-02 14:22 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-30 0:37 [PATCH] spi: add spi_tegra driver Colin Cross
2010-07-30 7:54 ` Thierry Reding
[not found] ` <20100730075443.GA17814-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2010-08-02 18:48 ` Erik Gilling
2010-08-01 6:21 ` Grant Likely
[not found] ` <AANLkTimUm_wj+gyxTa=X+845kLj1sZ9GF+jsmsBwxnLN-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-12 0:31 ` Erik Gilling
2010-08-12 15:24 ` Russell King - ARM Linux
[not found] ` <20100812152424.GB31982-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2010-08-12 18:44 ` Erik Gilling
[not found] ` <1280450224-25118-1-git-send-email-ccross-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2010-08-12 0:47 ` [PATCH v2] " Erik Gilling
[not found] ` <1281574023-25160-1-git-send-email-konkers-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org>
2010-08-12 19:54 ` Grant Likely
[not found] ` <AANLkTim4nL+Re=qc55CGS+ksq+ACtGe=vqOeGQ3HbQWM-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-25 21:22 ` Erik Gilling
[not found] ` <AANLkTincgapUK5ncs_t3ax=1Kt_56GdR_RVwRqdCm5ge-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-27 19:26 ` Erik Gilling
[not found] ` <AANLkTin4HxVLt=4VH-NQWhB-p_2EpX_yoTcwEOTJP3m_-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-27 20:13 ` Grant Likely
2010-08-25 21:23 ` [PATCH v3] " Erik Gilling
2010-09-01 22:16 ` [PATCH v4] " Erik Gilling
2010-09-01 22:18 ` Erik Gilling
2010-09-02 14:22 ` Grant Likely [this message]
[not found] ` <AANLkTimonLa1mUVSHR=QnR48HPtAZ5BW3BsVsg7MWALy-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-10 6:31 ` Grant Likely
[not found] ` <AANLkTini_PA3J+R4gEP4DzFpcAxHhdmDbcXxOtj2h81O-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-11 21:01 ` Erik Gilling
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