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In gpio_get(), _get_gpio_datain() and _get_gpio_dataout() get rid of un-necessary operation to compute gpio mask. The gpio offset passed to gpio_get() is sufficient to do that. Here is Russell's original comment: Can someone explain to me this: static int _get_gpio_datain(struct gpio_bank *bank, int gpio) { void __iomem *reg = bank->base + bank->regs->datain; return (__raw_readl(reg) & GPIO_BIT(bank, gpio)) != 0; } static int gpio_get(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip); void __iomem *reg = bank->base; int gpio = chip->base + offset; u32 mask = GPIO_BIT(bank, gpio); if (gpio_is_input(bank, mask)) return _get_gpio_datain(bank, gpio); else return _get_gpio_dataout(bank, gpio); } Given that bank->width on OMAP is either 32 or 16, and GPIO numbers for any GPIO chip are always aligned to 32 or 16, why does this code bother adding the chips base gpio number and then modulo the width? Surely this means if - for argument sake - you registered a GPIO chip with 8 lines followed by one with 16 lines, GPIO0..7 would be chip 0 bit 0..7, GPIO8..15 would be chip 1 bit 8..15, GPIO16..23 would be chip 1 bit 0..7. However, if you registered a GPIO chip with 16 lines first, it would mean GPIO0..15 would be chip 0 bit 0..15, and GPIO16..31 would be chip 1 bit 0..15. Surely this kind of behaviour is not intended? Is there a reason why the bitmask can't just be (1 << offset) where offset is passed into these functions as GPIO number - chip->base ? Reported-by: Russell King - ARM Linux <linux@arm.linux.org.uk> Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@ti.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com> |
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.. | ||
devres.c | ||
gpio-74x164.c | ||
gpio-ab8500.c | ||
gpio-adp5520.c | ||
gpio-adp5588.c | ||
gpio-bt8xx.c | ||
gpio-cs5535.c | ||
gpio-da9052.c | ||
gpio-davinci.c | ||
gpio-ep93xx.c | ||
gpio-generic.c | ||
gpio-it8761e.c | ||
gpio-janz-ttl.c | ||
gpio-ks8695.c | ||
gpio-langwell.c | ||
gpio-lpc32xx.c | ||
gpio-max730x.c | ||
gpio-max732x.c | ||
gpio-max7300.c | ||
gpio-max7301.c | ||
gpio-mc9s08dz60.c | ||
gpio-mc33880.c | ||
gpio-mcp23s08.c | ||
gpio-ml-ioh.c | ||
gpio-mpc8xxx.c | ||
gpio-mpc5200.c | ||
gpio-msm-v1.c | ||
gpio-msm-v2.c | ||
gpio-mxc.c | ||
gpio-mxs.c | ||
gpio-nomadik.c | ||
gpio-omap.c | ||
gpio-pca953x.c | ||
gpio-pcf857x.c | ||
gpio-pch.c | ||
gpio-pl061.c | ||
gpio-pxa.c | ||
gpio-rdc321x.c | ||
gpio-sa1100.c | ||
gpio-samsung.c | ||
gpio-sch.c | ||
gpio-sodaville.c | ||
gpio-stmpe.c | ||
gpio-sx150x.c | ||
gpio-tc3589x.c | ||
gpio-tegra.c | ||
gpio-timberdale.c | ||
gpio-tnetv107x.c | ||
gpio-tps65910.c | ||
gpio-tps65912.c | ||
gpio-twl4030.c | ||
gpio-ucb1400.c | ||
gpio-vr41xx.c | ||
gpio-vx855.c | ||
gpio-wm831x.c | ||
gpio-wm8350.c | ||
gpio-wm8994.c | ||
gpio-xilinx.c | ||
gpiolib.c | ||
Kconfig | ||
Makefile |