| Message ID | 20250410090251.1103979-6-primoz.fiser@norik.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Update PHYTEC i.MX93 DTS | expand |
On Thu, Apr 10, 2025 at 11:02:43AM +0200, Primoz Fiser wrote: > Add property 'no-1-8-v' by default to usdhc1 (eMMC) node. Bootloader > will take care of deleting the property in case SOM supports HS400 mode > (1.8V IO voltage feature flag has to be set in the EEPROM). what means of EEPROM here? Generally eMMC worked fixed voltage, why need 'no-1-8-v' here, even no HS400 support. Frank > > Signed-off-by: Primoz Fiser <primoz.fiser@norik.com> > --- > arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > index 3d84eed33074..d6589d26c875 100644 > --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > @@ -172,6 +172,7 @@ &usdhc1 { > pinctrl-2 = <&pinctrl_usdhc1_200mhz>; > bus-width = <8>; > non-removable; > + no-1-8-v; > status = "okay"; > }; > > -- > 2.34.1 >
Hi Frank, On 10. 04. 25 17:01, Frank Li wrote: > On Thu, Apr 10, 2025 at 11:02:43AM +0200, Primoz Fiser wrote: >> Add property 'no-1-8-v' by default to usdhc1 (eMMC) node. Bootloader >> will take care of deleting the property in case SOM supports HS400 mode >> (1.8V IO voltage feature flag has to be set in the EEPROM). > > what means of EEPROM here? > > Generally eMMC worked fixed voltage, why need 'no-1-8-v' here, even no > HS400 support. The phyCORE-i.MX93 SoM comes in two variants, one with 3.3V VDD_IO and the other one with 1.8V VDD_IO voltage set. The 3.3V variant can only support DDR52 mode, while 1.8V variant will support HS400ES eMMC mode. The information about VDD_IO option is encoded in the SoM's EEPROM. We read EEPROM in the bootloader and clear "no-1-8-v" flag in case of 1.8V SOM variant is detected. In case of EEPROM error (erased or read error) the fall-back option has to support both SoM variants, hence the "no-1-8-v" flag has to be set by default. BR, Primoz > > Frank >> >> Signed-off-by: Primoz Fiser <primoz.fiser@norik.com> >> --- >> arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi >> index 3d84eed33074..d6589d26c875 100644 >> --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi >> +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi >> @@ -172,6 +172,7 @@ &usdhc1 { >> pinctrl-2 = <&pinctrl_usdhc1_200mhz>; >> bus-width = <8>; >> non-removable; >> + no-1-8-v; >> status = "okay"; >> }; >> >> -- >> 2.34.1 >>
On Fri, Apr 11, 2025 at 08:51:18AM +0200, Primoz Fiser wrote: > Hi Frank, > > On 10. 04. 25 17:01, Frank Li wrote: > > On Thu, Apr 10, 2025 at 11:02:43AM +0200, Primoz Fiser wrote: > >> Add property 'no-1-8-v' by default to usdhc1 (eMMC) node. Bootloader > >> will take care of deleting the property in case SOM supports HS400 mode > >> (1.8V IO voltage feature flag has to be set in the EEPROM). > > > > what means of EEPROM here? > > > > Generally eMMC worked fixed voltage, why need 'no-1-8-v' here, even no > > HS400 support. > > The phyCORE-i.MX93 SoM comes in two variants, one with 3.3V VDD_IO and > the other one with 1.8V VDD_IO voltage set. > > The 3.3V variant can only support DDR52 mode, while 1.8V variant will > support HS400ES eMMC mode. > > The information about VDD_IO option is encoded in the SoM's EEPROM. We > read EEPROM in the bootloader and clear "no-1-8-v" flag in case of 1.8V > SOM variant is detected. > > In case of EEPROM error (erased or read error) the fall-back option has > to support both SoM variants, hence the "no-1-8-v" flag has to be set by > default. Thanks, can add such detail information at commit message. Frank > > BR, > Primoz > > > > > > > Frank > >> > >> Signed-off-by: Primoz Fiser <primoz.fiser@norik.com> > >> --- > >> arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 1 + > >> 1 file changed, 1 insertion(+) > >> > >> diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > >> index 3d84eed33074..d6589d26c875 100644 > >> --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > >> +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi > >> @@ -172,6 +172,7 @@ &usdhc1 { > >> pinctrl-2 = <&pinctrl_usdhc1_200mhz>; > >> bus-width = <8>; > >> non-removable; > >> + no-1-8-v; > >> status = "okay"; > >> }; > >> > >> -- > >> 2.34.1 > >> > > -- > Primoz Fiser > phone: +386-41-390-545 > email: primoz.fiser@norik.com > -- > Norik systems d.o.o. > Your embedded software partner > Slovenia, EU > phone: +386-41-540-545 > email: info@norik.com
diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi index 3d84eed33074..d6589d26c875 100644 --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi @@ -172,6 +172,7 @@ &usdhc1 { pinctrl-2 = <&pinctrl_usdhc1_200mhz>; bus-width = <8>; non-removable; + no-1-8-v; status = "okay"; };
Add property 'no-1-8-v' by default to usdhc1 (eMMC) node. Bootloader will take care of deleting the property in case SOM supports HS400 mode (1.8V IO voltage feature flag has to be set in the EEPROM). Signed-off-by: Primoz Fiser <primoz.fiser@norik.com> --- arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 1 + 1 file changed, 1 insertion(+)