| Message ID | 1515492109-753-6-git-send-email-vivek.gautam@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Tue, Jan 09, 2018 at 03:31:48PM +0530, Vivek Gautam wrote: > qcom,smmu-v2 is an arm,smmu-v2 implementation with specific > clock and power requirements. This smmu core is used with > multiple masters on msm8996, viz. mdss, video, etc. > Add bindings for the same. > > Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> > --- > > * Major change in this patch - > Changed compatible string from 'qcom,msm8996-smmu-v2' to > 'qcom,smmu-v2' to reflect the IP version rather than the > platform on which it is used. The bugs and how things are connected are all the same? I'd suggest you keep both strings. > The same IP is used across multiple platforms including msm8996, > and sdm845 etc. But for only 2 or so platforms a fallback is not really worth it. You'll probably be on SMMUv3 before too long... > > .../devicetree/bindings/iommu/arm,smmu.txt | 35 ++++++++++++++++++++++ > drivers/iommu/arm-smmu.c | 13 ++++++++ > 2 files changed, 48 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt > index 8a6ffce12af5..e4951288c87c 100644 > --- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt > +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt > @@ -17,6 +17,7 @@ conditions. > "arm,mmu-401" > "arm,mmu-500" > "cavium,smmu-v2" > + "qcom,smmu-v2" > > depending on the particular implementation and/or the > version of the architecture implemented. > @@ -71,6 +72,23 @@ conditions. > or using stream matching with #iommu-cells = <2>, and > may be ignored if present in such cases. > > +- clock-names: Should be "bus", and "iface" for "qcom,smmu-v2" > + implementation. > + > + "bus" clock for "qcom,smmu-v2" is required for downstream > + bus access and for the smmu ptw. > + > + "iface" clock is required to access smmu's registers through > + the TCU's programming interface. > + > +- clocks: Phandles for respective clocks described by clock-names. > + > +- power-domains: Phandles to SMMU's power domain specifier. This is > + required even if SMMU belongs to the master's power > + domain, as the SMMU will have to be enabled and > + accessed before master gets enabled and linked to its > + SMMU. > + > ** Deprecated properties: > > - mmu-masters (deprecated in favour of the generic "iommus" binding) : > @@ -137,3 +155,20 @@ conditions. > iommu-map = <0 &smmu3 0 0x400>; > ... > }; > + > + /* Qcom's arm,smmu-v2 implementation */ > + smmu4: iommu { > + compatible = "qcom,smmu-v2"; > + reg = <0xd00000 0x10000>; > + > + #global-interrupts = <1>; > + interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>, > + <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>, > + <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>; > + #iommu-cells = <1>; > + power-domains = <&mmcc MDSS_GDSC>; > + > + clocks = <&mmcc SMMU_MDP_AXI_CLK>, > + <&mmcc SMMU_MDP_AHB_CLK>; > + clock-names = "bus", "iface"; > + }; > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c > index 33bbcfedb896..2ade214c41bc 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -119,6 +119,7 @@ enum arm_smmu_implementation { > GENERIC_SMMU, > ARM_MMU500, > CAVIUM_SMMUV2, > + QCOM_SMMUV2, > }; > > struct arm_smmu_s2cr { > @@ -1971,6 +1972,17 @@ struct arm_smmu_match_data { > ARM_SMMU_MATCH_DATA(arm_mmu500, ARM_SMMU_V2, ARM_MMU500); > ARM_SMMU_MATCH_DATA(cavium_smmuv2, ARM_SMMU_V2, CAVIUM_SMMUV2); > > +static const char * const qcom_smmuv2_clks[] = { > + "bus", "iface", > +}; > + > +static const struct arm_smmu_match_data qcom_smmuv2 = { > + .version = ARM_SMMU_V2, > + .model = QCOM_SMMUV2, > + .clks = qcom_smmuv2_clks, > + .num_clks = ARRAY_SIZE(qcom_smmuv2_clks), > +}; > + > static const struct of_device_id arm_smmu_of_match[] = { > { .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 }, > { .compatible = "arm,smmu-v2", .data = &smmu_generic_v2 }, > @@ -1978,6 +1990,7 @@ struct arm_smmu_match_data { > { .compatible = "arm,mmu-401", .data = &arm_mmu401 }, > { .compatible = "arm,mmu-500", .data = &arm_mmu500 }, > { .compatible = "cavium,smmu-v2", .data = &cavium_smmuv2 }, > + { .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 }, > { }, > }; > MODULE_DEVICE_TABLE(of, arm_smmu_of_match); > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation >
Hi Rob, On 01/12/2018 03:53 AM, Rob Herring wrote: > On Tue, Jan 09, 2018 at 03:31:48PM +0530, Vivek Gautam wrote: >> qcom,smmu-v2 is an arm,smmu-v2 implementation with specific >> clock and power requirements. This smmu core is used with >> multiple masters on msm8996, viz. mdss, video, etc. >> Add bindings for the same. >> >> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> >> --- >> >> * Major change in this patch - >> Changed compatible string from 'qcom,msm8996-smmu-v2' to >> 'qcom,smmu-v2' to reflect the IP version rather than the >> platform on which it is used. > The bugs and how things are connected are all the same? I'd suggest you > keep both strings. Sure, compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2"; > >> The same IP is used across multiple platforms including msm8996, >> and sdm845 etc. > But for only 2 or so platforms a fallback is not really worth it. You'll > probably be on SMMUv3 before too long... Right. There's msm8998 as well, but as you said keeping both strings will make more sense. Thanks. Best regards Vivek [snip]
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt index 8a6ffce12af5..e4951288c87c 100644 --- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt @@ -17,6 +17,7 @@ conditions. "arm,mmu-401" "arm,mmu-500" "cavium,smmu-v2" + "qcom,smmu-v2" depending on the particular implementation and/or the version of the architecture implemented. @@ -71,6 +72,23 @@ conditions. or using stream matching with #iommu-cells = <2>, and may be ignored if present in such cases. +- clock-names: Should be "bus", and "iface" for "qcom,smmu-v2" + implementation. + + "bus" clock for "qcom,smmu-v2" is required for downstream + bus access and for the smmu ptw. + + "iface" clock is required to access smmu's registers through + the TCU's programming interface. + +- clocks: Phandles for respective clocks described by clock-names. + +- power-domains: Phandles to SMMU's power domain specifier. This is + required even if SMMU belongs to the master's power + domain, as the SMMU will have to be enabled and + accessed before master gets enabled and linked to its + SMMU. + ** Deprecated properties: - mmu-masters (deprecated in favour of the generic "iommus" binding) : @@ -137,3 +155,20 @@ conditions. iommu-map = <0 &smmu3 0 0x400>; ... }; + + /* Qcom's arm,smmu-v2 implementation */ + smmu4: iommu { + compatible = "qcom,smmu-v2"; + reg = <0xd00000 0x10000>; + + #global-interrupts = <1>; + interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>; + #iommu-cells = <1>; + power-domains = <&mmcc MDSS_GDSC>; + + clocks = <&mmcc SMMU_MDP_AXI_CLK>, + <&mmcc SMMU_MDP_AHB_CLK>; + clock-names = "bus", "iface"; + }; diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 33bbcfedb896..2ade214c41bc 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -119,6 +119,7 @@ enum arm_smmu_implementation { GENERIC_SMMU, ARM_MMU500, CAVIUM_SMMUV2, + QCOM_SMMUV2, }; struct arm_smmu_s2cr { @@ -1971,6 +1972,17 @@ struct arm_smmu_match_data { ARM_SMMU_MATCH_DATA(arm_mmu500, ARM_SMMU_V2, ARM_MMU500); ARM_SMMU_MATCH_DATA(cavium_smmuv2, ARM_SMMU_V2, CAVIUM_SMMUV2); +static const char * const qcom_smmuv2_clks[] = { + "bus", "iface", +}; + +static const struct arm_smmu_match_data qcom_smmuv2 = { + .version = ARM_SMMU_V2, + .model = QCOM_SMMUV2, + .clks = qcom_smmuv2_clks, + .num_clks = ARRAY_SIZE(qcom_smmuv2_clks), +}; + static const struct of_device_id arm_smmu_of_match[] = { { .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 }, { .compatible = "arm,smmu-v2", .data = &smmu_generic_v2 }, @@ -1978,6 +1990,7 @@ struct arm_smmu_match_data { { .compatible = "arm,mmu-401", .data = &arm_mmu401 }, { .compatible = "arm,mmu-500", .data = &arm_mmu500 }, { .compatible = "cavium,smmu-v2", .data = &cavium_smmuv2 }, + { .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 }, { }, }; MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
qcom,smmu-v2 is an arm,smmu-v2 implementation with specific clock and power requirements. This smmu core is used with multiple masters on msm8996, viz. mdss, video, etc. Add bindings for the same. Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> --- * Major change in this patch - Changed compatible string from 'qcom,msm8996-smmu-v2' to 'qcom,smmu-v2' to reflect the IP version rather than the platform on which it is used. The same IP is used across multiple platforms including msm8996, and sdm845 etc. .../devicetree/bindings/iommu/arm,smmu.txt | 35 ++++++++++++++++++++++ drivers/iommu/arm-smmu.c | 13 ++++++++ 2 files changed, 48 insertions(+)