Hi Grant,
>> <...>
>> +#include <asm/mach-ath79/ath79_spi_platform.h>
>> +
>> +#define DRV_DESC "SPI controller driver for Atheros AR71XX/AR724X/AR91X"
>
> Used exactly once. Don't bother with a #define
Ok.
>> +#define DRV_NAME "ath79-spi"
>> +
>> +struct ath79_spi {
>> + struct spi_bitbang bitbang;
>> + u32 ioc_base;
>> + u32 reg_ctrl;
>> +
>> + void __iomem *base;
>> +
>> + struct platform_device *pdev;
>> +};
>> +
>> +static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned reg)
>> +{
>> + return __raw_readl(sp->base + reg);
>> +}
>> +
>> +static inline void ath79_spi_wr(struct ath79_spi *sp, unsigned reg, u32 val)
>> +{
>> + __raw_writel(val, sp->base + reg);
>> +}
>
> This is suspect. Why is __raw_{readl,writel} being used instead of
> ioread32/iowrite32? The __raw versions don't provide any kind of
> ordering barriers.
Mainly because the resulting code is smaller, and the performance is a bit
better with the use of the __raw versions. The controller is embedded into the
SoC and the registers are memory mapped, so i think it is safe to access them
with __raw_{readl,writel}. However I can change it if that is the preferred
method.
>> <...>
>> +static int ath79_spi_probe(struct platform_device *pdev)
>
> __devinit
I will add this.
>
>> +{
>> + struct spi_master *master;
>> + struct ath79_spi *sp;
>> + struct ath79_spi_platform_data *pdata;
>> + struct resource *r;
>> + int ret;
>> +
>> + master = spi_alloc_master(&pdev->dev, sizeof(*sp));
>> + if (master == NULL) {
>> + dev_err(&pdev->dev, "failed to allocate spi master\n");
>> + return -ENOMEM;
>> + }
>> +
>> + sp = spi_master_get_devdata(master);
>> + platform_set_drvdata(pdev, sp);
>> +
>> + pdata = pdev->dev.platform_data;
>> +
>> + master->setup = ath79_spi_setup;
>> + master->cleanup = ath79_spi_cleanup;
>> + if (pdata) {
>> + master->bus_num = pdata->bus_num;
>> + master->num_chipselect = pdata->num_chipselect;
>> + } else {
>> + master->bus_num = 0;
>
> Use -1 so that a bus number can be dynamically assigned
All right.
>> <...>
>> +static int ath79_spi_remove(struct platform_device *pdev)
>
> __devexit
>
>> +{
>> + struct ath79_spi *sp = platform_get_drvdata(pdev);
>> +
>> + spi_bitbang_stop(&sp->bitbang);
>> + iounmap(sp->base);
>> + platform_set_drvdata(pdev, NULL);
>> + spi_master_put(sp->bitbang.master);
>> +
>> + return 0;
>> +}
>> +
>> +static struct platform_driver ath79_spi_drv = {
>> + .probe = ath79_spi_probe,
>> + .remove = ath79_spi_remove,
>
> __devexit_p(ath79_spi_remove),
>
I will add these annotations as well.
Thank you,
Gabor
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