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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jun 2023 23:52:12.5421 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2e16ff86-1265-4a58-82d0-08db661fe216 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT033.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7570 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Hi Geert, On Wed, May 31, 2023 at 15:09 Geert Uytterhoeven wrote: > On Wed, May 31, 2023 at 12:04 AM Brad Larson wrote: >> On Wed, May 24, 2023 at 13:52 Geert Uytterhoeven wrote: >> > On Tue, May 23, 2023 at 9:30 PM Brad Larson wrote: >> >> On 5/16/23 09:54, Michal Simek wrote: >> >> > On 5/15/23 20:16, Brad Larson wrote: ... >> >> >> + /* CLUSTER 0 */ >> >> >> + cpu0: cpu@0 { >> >> >> + device_type = "cpu"; >> >> >> + compatible = "arm,cortex-a72"; >> >> >> + reg = <0 0x0>; >> >> > >> >> > Do you really need 2/0 split here. The first cell is 0 anyway. >> >> >> >> Yes following 64-bit system definition >> > >> > You mean for the 64-bit main address space? >> > The CPU address space under /cpus is unrelated. >> >> Yes, the reg prop for this node is CPU/threads per dt spec. Checked the history and >> the Elba dt was derived from socionext for these nodes and this is how those device >> trees are configured along with over a dozen other devices. I changed to >> address-cells = <1> and dropped the leading zero from all cpu* reg<> and booting >> the system I'm observing no change. Looking in drivers/of I'm not seeing where >> cpu*/reg is read and used, any recommendation? > > drivers/of/cpu.c > > Looks like there are lots of DTS files that use #address-cells = <2> for > CPU nodes :-( > > git grep -w -A1 cpus -- "*dts*" | grep address-cells | grep "<2>" > > I would use <1> is the first cell is always zero... I'll do that. Tha variation across DTS is likely coming from ~5.10 devicetree/bindings/arm/cpus.txt - #address-cells ... # On ARM v8 64-bit systems value should be set to 2, that corresponds to the MPIDR_EL1 register size. If MPIDR_EL1[63:32] value is equal to 0 on all CPUs in the system, #address-cells can be set to 1, since MPIDR_EL1[63:32] bits are not used for CPUs identification. where the size of MPIDR_EL1 register is 2 for Elba cores. However the shorthand is allowed if MPIDR_EL1[63:32] bita are not used. Latest version: On ARM v8 64-bit systems this property is required and matches the MPIDR_EL1 register affinity bits. * If cpus node's #address-cells property is set to 2 The first reg cell bits [7:0] must be set to bits [39:32] of MPIDR_EL1. The second reg cell bits [23:0] must be set to bits [23:0] of MPIDR_EL1. * If cpus node's #address-cells property is set to 1 The reg cell bits [23:0] must be set to bits [23:0] of MPIDR_EL1. All other bits in the reg cells must be set to 0. 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