On Tuesday 30 October 2012 12:44 AM, Stephen Warren wrote:
> On 10/29/2012 11:18 AM, Laxman Dewangan wrote:
>> Tegra20/Tegra30 supports the spi interface through its SLINK
>> controller. Add spi driver for SLINK controller.
>> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
>> +config SPI_TEGRA20_SLINK
>> + tristate "Nvidia Tegra20/Tegra30 SLINK Controller"
>> + depends on ARCH_TEGRA&& TEGRA20_APB_DMA
> I think it depends on DMAENGINE, not the specific driver now, doesn't it?
Taking example from the mfd, we depends on particular driver, not from
the core driver.
I like to have this depends on Tegra20_apb_dma.
>> + x = 0;
>> + for (i = 0; nbytes&& (i< tspi->bytes_per_word);
>> + i++, nbytes--)
>> + x |= ((*tx_buf++)<< i*8);
>> + tegra_slink_writel(tspi, x, SLINK_TX_FIFO);
>> + }
>> + }
> The if and the else there are basically identical now. Can't the else
> branch simply be replaced by the if branch? At most I think the
> difference comes down to max_n_32bit v.s. fifo_words_left calculations
> being slight different; everything else is the same.
>
> I suppose this isn't a big deal though; we could clean it up later if
> necessary.
>
I like to clean it later.
>> + val |= SLINK_PACKED;
>> + tegra_slink_writel(tspi, val, SLINK_DMA_CTL);
>> + udelay(1);
>> + wmb();
> Why the udelay() and wmb()?
udelay() is suggetsed by ASIC.
wmb() is lying in our downstream code and hence it is there but I dont
think it is require now. I will remove it.
>> +static int tegra_slink_runtime_resume(struct device *dev)
>> +{
>> + struct spi_master *master = dev_get_drvdata(dev);
>> + struct tegra_slink_data *tspi = spi_master_get_devdata(master);
>> +
>> + return tegra_slink_clk_prepare(tspi);
>> +}
> Why not move the body of tegra_slink_clk_{un,prepare} inside those
> functions, since they're only called from those functions?
>
Fine, I will do this,
>> +MODULE_ALIAS("platform:tegra_slink-slink");
> I think that's a typo.
Yes, I will correct it.
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