On 2014年11月28日 17:33, Arnd Bergmann wrote:
On Friday 28 November 2014 14:29:47 Zhou Wang wrote:Set ARCH_NR_GPIO for Hisilicon Soc Hip04, which has 4 GPIO controllers with 32 GPIOs each. Signed-off-by: Zhou Wang <wangzhou.bry@xxxxxxxxx> --- arch/arm/Kconfig | 1 + arch/arm/configs/hisi_defconfig | 3 +++ 2 files changed, 4 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 89c4b5c..26aae1e 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1509,6 +1509,7 @@ config ARCH_NR_GPIO default 352 if ARCH_VT8500 default 288 if ARCH_ROCKCHIP default 264 if MACH_H4700 + default 128 if ARCH_HIP04 default 0 help Maximum number of GPIOs in the system.If I remember correctly, you don't actually need to set this if all gpio clients are using the new gpio descriptor interfaces instead of gpio numbers. Would that work for you? You'd have to know which devices
Hi Arnd, If I don't set this, it will use the default ARCH_NR_GPIO(512), then the range of GPIO number will be 384~511 which is very strange to users, because Hip04 based machines can only support 128 GPIOs. Best Regards, Zhou Wang
can be connected to the gpio controller for all hip04 based machines, but I think this is a short list of boards. Linus, one question for you: Does the ARCH_NR_GPIO actually work as designed? I see that e.g. OMAP4 defines 192 GPIO lines but does not have an ARCH_NR_GPIO setting. In an OMAP4-only kernel you would get the default value (512) from include/asm-generic/gpio.h, and in a multiplatform kernel you get at least 512 if any of the (ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 || ARCH_SHMOBILE || ARCH_TEGRA) are set, so that is still good. However if one builds a kernel that just enables OMAP4 and HIP04, I suspect it can't work on OMAP4 for any gpio line above 128, which seems to be a fundamental multiplatform problem. Do we neet to increase the default to 512 for all ARCH_MULTIPLATFORM configurations and just leave ARCH_SHMOBILE, ARCH_TEGRA and MACH_H4700 here as special cases? Arnd
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