On Fri, 08 May 2015, Geert Uytterhoeven wrote: > On Thu, May 7, 2015 at 9:01 AM, Lee Jones <lee.jones@xxxxxxxxxx> wrote: > >> I have a follow up question regarding interrupt. I see many I2C bus drivers > >> request interrupt with flag = 0. Why not using IRQF_SHARED? > > > > Probably because that particular IRQ is only used by the I2C > > Controller. I'm not exactly sure that you're getting at? Why do you > > think it should be shared? You should only flag it as shared if it > > is. > > However, that's something the driver can't know. > Sharing interrupts is an integration property. The same IP core may share its > interrupt on one SoC, and not on another. I guess that would depend on the IP. If this is part of an MFD, you'd know if you only hand a single interrupt line coming into the chip or not. If the IP can be moved around (copy & pasted) into different chips, then yes, that might change. How does one share an interrupt with other drivers if all them don't know the IRQ is shared thought? -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
