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1;BN1PR03MB172;7:zoTgTNWyeMgGspW340qffWmSyzD9WDBQV87rhY0LL9FBYj8UoRdkMaZBr80LqUHMjuvur+6/vvDN5wL7dv+F2iDSRQYfbc0Jes4OOZajsH/Vu+ipiniIFboKQ5TrxWajS8nClQIDtkY0458KJoKOJw3JXI94cC9k9UH2RVAUuEQxZdlgzNN93wqmYN+Z5rSpFENbNcbDKWjcx20DiQ9qBo9GDQsstBnXTM3YKq8/9AdaInRULHP94CGdPaC5n+rphVsvCLejzuOziM7maxUAt4JaQ1hX1oJzcY3Ky57L0/Sz/Q/asgo2xKV6Zx2JLTHpiGTr7BY75aLPf7n70xEeuw== X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2017 15:34:48.5441 (UTC) X-MS-Exchange-CrossTenant-Id: 5afe0b00-7697-4969-b663-5eab37d5f47e X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=5afe0b00-7697-4969-b663-5eab37d5f47e;Ip=[192.88.168.50];Helo=[tx30smr01.am.freescale.net] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN1PR03MB172 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2017-06-09 at 15:46 +0200, Lothar Waßmann wrote: > On Fri, 9 Jun 2017 13:58:15 +0300 Leonard Crestez wrote: > > On Thu, 2017-06-08 at 13:45 -0300, Fabio Estevam wrote: > > > On Thu, Jun 8, 2017 at 1:26 PM, Leonard Crestez  wrote: > > > > +                       tempmon: tempmon { > > > > +                               compatible = "fsl,imx6ul-tempmon", "fsl,imx6sx-tempmon"; > > > > +                               interrupts = ; > > > > +                               fsl,tempmon = <&anatop>; > > > > +                               fsl,tempmon-data = <&ocotp>; > > > > +                               clocks = <&clks IMX6UL_CLK_PLL3_USB_OTG>; > > > Does the IMX6UL_CLK_PLL3_USB_OTG clock really control tempmon? Please > > > double check. > > Yes, as far as I can tell the tempmon block uses the 480 Mhz PLL3 clock > > directly. This is similar to other imx6 SOCs. This PLL is used for > > stuff like USB but not only that. My understanding is the _USB_OTG > > suffix is descriptive, similar to PLL4_AUDIO and PLL6_ENET. Other non- > > usb components use PLL3 (like UART) but through other gates/dividers. > > > > Setting this to IMX6UL_CLK_DUMMY will cause temperature reads to fail. > > Even if PLL3 usually ends up being constantly enabled because of uarts > > this is not true at imx_thermal_probe time (or uarts can be disabled). > > > Since the driver is accessing the OCOTP registers it definitely needs > the IMX6UL_CLK_OCOTP too! > I don't think so. OCOTP reads fuse values into shadows registers on chip reset and values seem to be available even if it's specific OCOTP clock is off. I think that clock is only required for writes or shadow updates. In theory perhaps tempmon could be made to read ocotp through the imx- ocotp nvmem driver? It is not clear in what scenario this would actually be required. This discussion is not specific to 6ul/6ull. There are other reads from ocotp which don't enable it's clock, for example imx6q_opp_check_speed_grading. -- Regards, Leonard