On Wed 03 Sep 05:49 PDT 2014, Kumar Gala wrote: > > On Sep 2, 2014, at 3:04 PM, Bjorn Andersson <Bjorn.Andersson@xxxxxxxxxxxxxx> wrote: > > > Changes since v2: > > - MODULE_DEVICE_TABLE > > - Changed prefix to qcom > > - Cleaned up includes > > - Rely on reg and num-locks to figure out stride, instead of of_match data > > I know Jeff prefers this method of computing stride, but I’m not a fan as > there isn’t a reason one could adjust qcom,num-locks in the dt for some > reason and leave regs alone. > All the current platform it's 32 consecutive mutexes with either 4 or 128 byte stride, so encoding it as data either way works fine. The hardware you're trying to describe with your dt is the addresses that spans your mutex registers and how many there are. So from the HW/dts pov I don't see why you would like to do this. Then looking in the caf code, there is a limit of max 8 mutexes. So apparently there is some sort of usecase, I just don't know what or if it's valid from a dt pov. Going to that future awesome SoCs where it's still called tcsr-mutex, but with a stride of 4096 bytes makes me wonder; is that really a consecutive 128kb with nothing else in-between that we can ioremap? I.e. can we really reuse this driver straight off for that SoC? > > diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt > > +- compatible: > > + Usage: required > > + Value type: <string> > > + Definition: must be one of: > > + "qcom,sfpb-mutex", > > + "qcom,tcsr-mutex” > > I dont get the purpose of having different compatible strings if there is no > difference in the code between them. > The semantics are the same, but there are no mutex registers in the tcsr block in e.g 8960, so the name is just missleading. I assume that's why you didn't follow caf and used the compatible "sfpb" in the first place? Regards, Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
