On Fri, Jul 14, 2017 at 05:11:09PM +0300, Leonard Crestez wrote: > On imx6sx accessing OCOTP directly is wrong because the ocotp clock > needs to be enabled first. Use the nvmem-cells binding instead. > > This requirement does not apply to older imx6qdl chips because there the > ocotp access clock (clk_ipg_s) is always enabled. > > This is visible by comparing the "System Clocks, Gating, and Override" > tables (OCOTP rows) in the 6DQ and 6SX manuals: > http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6SXRM.pdf > http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6DQRM.pdf > > This happens to work right now because the ocotp clock might be enabled > for some other reason. In particular the it might be enabled from the > bootloader and it only gets disabled late during boot in > clk_disable_unused, after imx-thermal has completed probing. > > If imx-thermal is compiled as a module then the system can hang on > probe. > > Reported-by: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Leonard Crestez <leonard.crestez@xxxxxxx> I cannot apply dts changes until the driver part gets landed on mainline. Please remind me when dts patches can be applied. Shawn > --- > arch/arm/boot/dts/imx6sx.dtsi | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi > index f16b9df..580af30 100644 > --- a/arch/arm/boot/dts/imx6sx.dtsi > +++ b/arch/arm/boot/dts/imx6sx.dtsi > @@ -675,7 +675,8 @@ > compatible = "fsl,imx6sx-tempmon", "fsl,imx6q-tempmon"; > interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>; > fsl,tempmon = <&anatop>; > - fsl,tempmon-data = <&ocotp>; > + nvmem-cells = <&tempmon_calib>, <&tempmon_temp_grade>; > + nvmem-cell-names = "calib", "temp_grade"; > clocks = <&clks IMX6SX_CLK_PLL3_USB_OTG>; > }; > > @@ -993,9 +994,19 @@ > }; > > ocotp: ocotp@021bc000 { > + #address-cells = <1>; > + #size-cells = <1>; > compatible = "fsl,imx6sx-ocotp", "syscon"; > reg = <0x021bc000 0x4000>; > clocks = <&clks IMX6SX_CLK_OCOTP>; > + > + tempmon_calib: calib@38 { > + reg = <0x38 4>; > + }; > + > + tempmon_temp_grade: temp-grade@20 { > + reg = <0x20 4>; > + }; > }; > > sai1: sai@021d4000 { > -- > 2.7.4 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
