| Message ID | 20240930213008.159647-4-andreas@kemnade.info (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | ARM: dts: omap: omap4-epson-embt2ws: misc gpio definitions | expand |
On 01/10/2024 00:30, Andreas Kemnade wrote: > Set them to the state seen in a running system, initialized > by vendor u-boot or kernel. Add line names where they are defined in the > vendor kernel. > gpio15 resets something in the display, otherwise meaning of the > gpios is not known. > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info> > --- > .../boot/dts/ti/omap/omap4-epson-embt2ws.dts | 84 +++++++++++++++++++ > 1 file changed, 84 insertions(+) > > diff --git a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts > index cc1b6080bf95..c8205ae89840 100644 > --- a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts > +++ b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts > @@ -115,6 +115,65 @@ wl12xx_vmmc: wl12xx-vmmc { > }; > }; > > +&gpio1 { > + pinctrl-names = "default"; > + pinctrl-0 = <&gpio1_hog_pins &gpio1wk_hog_pins>; > + > + lb-reset-hog { > + gpio-hog; > + gpios = <9 GPIO_ACTIVE_HIGH>; > + output-low; > + line-name = "lb_reset"; > + }; Just curious, what does lb stand for. > + > + power-en-hog { > + gpio-hog; > + gpios = <10 GPIO_ACTIVE_HIGH>; > + output-high; > + line-name = "power_en"; > + }; > + > + panel-power-en-hog { > + gpio-hog; > + gpios = <14 GPIO_ACTIVE_HIGH>; > + output-low; > + line-name = "panel_power_en"; > + }; Is panel always enabled? I didn't see a panel driver else it could be hooked to panel regulator? > + > + blc-r-hog { > + gpio-hog; > + gpios = <17 GPIO_ACTIVE_HIGH>; > + output-low; > + line-name = "blc_r"; > + }; this should be modeled as a gpio regulator and paried to backlight left? > + > + blc-l-hog { > + gpio-hog; > + gpios = <16 GPIO_ACTIVE_HIGH>; > + output-low; > + line-name = "blc_l"; > + }; this should be modeled as a gpio regulator and paried to backlight right? > + > + high-hog { > + gpio-hog; > + gpios = <15 GPIO_ACTIVE_HIGH /* maybe dsi to dpi chip reset? */ > + 21 GPIO_ACTIVE_HIGH > + 26 GPIO_ACTIVE_HIGH>; > + output-high; > + line-name = "unknown-high"; > + }; > + > + low-hog { > + gpio-hog; > + gpios = <18 GPIO_ACTIVE_HIGH > + 19 GPIO_ACTIVE_HIGH > + 20 GPIO_ACTIVE_HIGH > + 22 GPIO_ACTIVE_HIGH>; > + output-low; > + line-name = "unknown-low"; > + }; These are probably OK as we don't know their actual function. > +}; > + > &i2c1 { > pinctrl-names = "default"; > pinctrl-0 = <&i2c1_pins>; > @@ -406,6 +465,22 @@ OMAP4_IOPAD(0x56, PIN_INPUT_PULLUP | MUX_MODE3) /* gpio35 */ > >; > }; > > + gpio1_hog_pins: pinmux-gpio1-hog-pins { > + pinctrl-single,pins = < > + OMAP4_IOPAD(0x1b4, PIN_OUTPUT | MUX_MODE3) /* gpio14 */ > + OMAP4_IOPAD(0x1b8, PIN_OUTPUT | MUX_MODE3) /* gpio16 */ > + OMAP4_IOPAD(0x1ba, PIN_OUTPUT | MUX_MODE3) /* gpio17 */ > + > + OMAP4_IOPAD(0x1b6, PIN_OUTPUT | MUX_MODE3) /* gpio15 */ > + OMAP4_IOPAD(0x1bc, PIN_OUTPUT | MUX_MODE3) /* gpio18 */ > + OMAP4_IOPAD(0x1be, PIN_OUTPUT | MUX_MODE3) /* gpio19 */ > + OMAP4_IOPAD(0x1c0, PIN_OUTPUT | MUX_MODE3) /* gpio20 */ > + OMAP4_IOPAD(0x1c2, PIN_OUTPUT | MUX_MODE3) /* gpio21 */ > + OMAP4_IOPAD(0x1c4, PIN_OUTPUT | MUX_MODE3) /* gpio22 */ > + OMAP4_IOPAD(0x1cc, PIN_OUTPUT | MUX_MODE3) /* gpio26 */ > + >; > + }; > + > i2c1_pins: pinmux-i2c1-pins { > pinctrl-single,pins = < > OMAP4_IOPAD(0x122, PIN_INPUT_PULLUP | MUX_MODE0) /* i2c1_scl */ > @@ -527,6 +602,15 @@ OMAP4_IOPAD(0x1c8, PIN_OUTPUT | MUX_MODE3) /* gpio_24 / WLAN_EN */ > }; > }; > > +&omap4_pmx_wkup { > + gpio1wk_hog_pins: pinmux-gpio1wk-hog-pins { > + pinctrl-single,pins = < > + OMAP4_IOPAD(0x68, PIN_INPUT_PULLDOWN | MUX_MODE3) /* gpio9 */ > + OMAP4_IOPAD(0x6a, PIN_INPUT | MUX_MODE3) /* gpio10 */ > + >; > + }; > +}; > + > &uart2 { > pinctrl-names = "default"; > pinctrl-0 = <&uart2_pins &bt_pins>;
Am Fri, 4 Oct 2024 10:53:57 +0300 schrieb Roger Quadros <rogerq@kernel.org>: > On 01/10/2024 00:30, Andreas Kemnade wrote: > > Set them to the state seen in a running system, initialized > > by vendor u-boot or kernel. Add line names where they are defined > > in the vendor kernel. > > gpio15 resets something in the display, otherwise meaning of the > > gpios is not known. > > > > Signed-off-by: Andreas Kemnade <andreas@kemnade.info> > > --- > > .../boot/dts/ti/omap/omap4-epson-embt2ws.dts | 84 > > +++++++++++++++++++ 1 file changed, 84 insertions(+) > > > > diff --git a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts > > b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts index > > cc1b6080bf95..c8205ae89840 100644 --- > > a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts +++ > > b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts @@ -115,6 > > +115,65 @@ wl12xx_vmmc: wl12xx-vmmc { }; > > }; > > > +&gpio1 { > > + pinctrl-names = "default"; > > + pinctrl-0 = <&gpio1_hog_pins &gpio1wk_hog_pins>; > > + > > + lb-reset-hog { > > + gpio-hog; > > + gpios = <9 GPIO_ACTIVE_HIGH>; > > + output-low; > > + line-name = "lb_reset"; > > + }; > > Just curious, what does lb stand for. > me too. Maybe b is the same as in cb static struct gpio bt2ws_lb_gpios[] = { {BLC_L_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_l" }, {BLC_R_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_r" }, {LB_RESET_GPIO,GPIOF_OUT_INIT_LOW, "gpio_lb_reset"}, {POWER_EN_GPIO,GPIOF_OUT_INIT_HIGH, "gpio_power_en"}, {PANEL_POWER_EN_GPIO,GPIOF_OUT_INIT_LOW, "gpio_panel_power_en"}, }; That is what is in the vendor kernel and matches > > + > > + power-en-hog { > > + gpio-hog; > > + gpios = <10 GPIO_ACTIVE_HIGH>; > > + output-high; > > + line-name = "power_en"; > > + }; > > + > > + panel-power-en-hog { > > + gpio-hog; > > + gpios = <14 GPIO_ACTIVE_HIGH>; > > + output-low; > > + line-name = "panel_power_en"; > > + }; > > Is panel always enabled? I didn't see a panel driver > else it could be hooked to panel regulator? > Panels are behind two dsi to dpi converters. I have a driver. At the moment, I boot into vendor v3.0 kernel, reprogram boot order, warm reboot into mainline u-boot + kernel to get display working. I can read registers via dsi at least after blanking the panel for the first time. Blanking/unblanking seems to work. With a low pulse on gpio15 I can reset something in the display which the vendor kernel can recover from but not my mainline driver. Then no communication with the display seem to work. About gpio 10/14 I know only the name (from the possibly kernel sources and matching /sys/kernel/debug/gpio). And that knowledge I want to forward into the formal hardware description, the device tree. $ grep -R PANEL_POWER_EN * arch/arm/mach-omap2/board-bt2ws.c: {PANEL_POWER_EN_GPIO,GPIOF_OUT_INIT_LOW, "gpio_panel_power_en"}, arch/arm/mach-omap2/board-bt2ts.c: {PANEL_POWER_EN_GPIO,GPIOF_OUT_INIT_LOW, "gpio_panel_power_en"}, include/video/omap-panel-bt2.h:#define PANEL_POWER_EN_GPIO 14 // GPIO But I did not get the supposed vendor kernel to fully boot. I have the verdict that I do not have the exact sources of the kernel which is running. I also did not notice any change in behaviour when toggling these gpios. So either they are a leftover from another board revision or something gets supplied by some parasitic ways. I think the best is to explain the situation more in the comments. What is a bit difficult is here is that there is something done in the m3 processors but apparently nothing vital to having display output (tried with an initrd without any m3 firmware), probably doing something camera-related, so the kernel sources do not give a full picture of the hardware anyways. BTW: do you know how to best trace gpio changes done by the vendor kernel without recompiling it? I managed to write a module deviating the master_xfre function for i2c to log things. > > + > > + blc-r-hog { > > + gpio-hog; > > + gpios = <17 GPIO_ACTIVE_HIGH>; > > + output-low; > > + line-name = "blc_r"; > > + }; > > this should be modeled as a gpio regulator and paried to backlight > left? > Discussed in patch 2. Regards, Andreas
diff --git a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts index cc1b6080bf95..c8205ae89840 100644 --- a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts +++ b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts @@ -115,6 +115,65 @@ wl12xx_vmmc: wl12xx-vmmc { }; }; +&gpio1 { + pinctrl-names = "default"; + pinctrl-0 = <&gpio1_hog_pins &gpio1wk_hog_pins>; + + lb-reset-hog { + gpio-hog; + gpios = <9 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "lb_reset"; + }; + + power-en-hog { + gpio-hog; + gpios = <10 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "power_en"; + }; + + panel-power-en-hog { + gpio-hog; + gpios = <14 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "panel_power_en"; + }; + + blc-r-hog { + gpio-hog; + gpios = <17 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "blc_r"; + }; + + blc-l-hog { + gpio-hog; + gpios = <16 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "blc_l"; + }; + + high-hog { + gpio-hog; + gpios = <15 GPIO_ACTIVE_HIGH /* maybe dsi to dpi chip reset? */ + 21 GPIO_ACTIVE_HIGH + 26 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "unknown-high"; + }; + + low-hog { + gpio-hog; + gpios = <18 GPIO_ACTIVE_HIGH + 19 GPIO_ACTIVE_HIGH + 20 GPIO_ACTIVE_HIGH + 22 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "unknown-low"; + }; +}; + &i2c1 { pinctrl-names = "default"; pinctrl-0 = <&i2c1_pins>; @@ -406,6 +465,22 @@ OMAP4_IOPAD(0x56, PIN_INPUT_PULLUP | MUX_MODE3) /* gpio35 */ >; }; + gpio1_hog_pins: pinmux-gpio1-hog-pins { + pinctrl-single,pins = < + OMAP4_IOPAD(0x1b4, PIN_OUTPUT | MUX_MODE3) /* gpio14 */ + OMAP4_IOPAD(0x1b8, PIN_OUTPUT | MUX_MODE3) /* gpio16 */ + OMAP4_IOPAD(0x1ba, PIN_OUTPUT | MUX_MODE3) /* gpio17 */ + + OMAP4_IOPAD(0x1b6, PIN_OUTPUT | MUX_MODE3) /* gpio15 */ + OMAP4_IOPAD(0x1bc, PIN_OUTPUT | MUX_MODE3) /* gpio18 */ + OMAP4_IOPAD(0x1be, PIN_OUTPUT | MUX_MODE3) /* gpio19 */ + OMAP4_IOPAD(0x1c0, PIN_OUTPUT | MUX_MODE3) /* gpio20 */ + OMAP4_IOPAD(0x1c2, PIN_OUTPUT | MUX_MODE3) /* gpio21 */ + OMAP4_IOPAD(0x1c4, PIN_OUTPUT | MUX_MODE3) /* gpio22 */ + OMAP4_IOPAD(0x1cc, PIN_OUTPUT | MUX_MODE3) /* gpio26 */ + >; + }; + i2c1_pins: pinmux-i2c1-pins { pinctrl-single,pins = < OMAP4_IOPAD(0x122, PIN_INPUT_PULLUP | MUX_MODE0) /* i2c1_scl */ @@ -527,6 +602,15 @@ OMAP4_IOPAD(0x1c8, PIN_OUTPUT | MUX_MODE3) /* gpio_24 / WLAN_EN */ }; }; +&omap4_pmx_wkup { + gpio1wk_hog_pins: pinmux-gpio1wk-hog-pins { + pinctrl-single,pins = < + OMAP4_IOPAD(0x68, PIN_INPUT_PULLDOWN | MUX_MODE3) /* gpio9 */ + OMAP4_IOPAD(0x6a, PIN_INPUT | MUX_MODE3) /* gpio10 */ + >; + }; +}; + &uart2 { pinctrl-names = "default"; pinctrl-0 = <&uart2_pins &bt_pins>;
Set them to the state seen in a running system, initialized by vendor u-boot or kernel. Add line names where they are defined in the vendor kernel. gpio15 resets something in the display, otherwise meaning of the gpios is not known. Signed-off-by: Andreas Kemnade <andreas@kemnade.info> --- .../boot/dts/ti/omap/omap4-epson-embt2ws.dts | 84 +++++++++++++++++++ 1 file changed, 84 insertions(+)