[PATCH v1 1/3] ARM: dts: imx6qdl-apalis: Do not rely on DDC I2C bus bitbang for HDMI

[PATCH v1 1/3] ARM: dts: imx6qdl-apalis: Do not rely on DDC I2C bus bitbang for HDMI

[Sanchayan Maity]

Remove the use of DDC I2C bus bitbang to support reading of EDID
and rely on support from internal HDMI I2C master controller instead.
As a result remove the device tree property ddc-i2c-bus.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
Hello,

This patch is tested with the following patch applied
https://patchwork.kernel.org/patch/9296883/

and is based on the suggestions from Vladimir
https://lkml.org/lkml/2016/8/29/322

This and following two patches are based on top of shawn's
for-next branch.

Regards,
Sanchayan.
---
 arch/arm/boot/dts/imx6q-apalis-ixora.dts |  6 ------
 arch/arm/boot/dts/imx6qdl-apalis.dtsi    | 25 +++++++++----------------
 2 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/arch/arm/boot/dts/imx6q-apalis-ixora.dts b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
index 207b85b..d99979e 100644
--- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
+++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
@@ -55,7 +55,6 @@
 		     "fsl,imx6q";
 
 	aliases {
-		i2c0 = &i2cddc;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;
 		i2c3 = &i2c3;
@@ -186,11 +185,6 @@
 };
 
 &hdmi {
-	ddc-i2c-bus = <&i2cddc>;
-	status = "okay";
-};
-
-&i2cddc {
 	status = "okay";
 };
 
diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
index 99e323b..8c67dd8 100644
--- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
@@ -53,18 +53,6 @@
 		status = "disabled";
 	};
 
-	/* DDC_I2C: I2C2_SDA/SCL on MXM3 205/207 */
-	i2cddc: i2c@0 {
-		compatible = "i2c-gpio";
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_i2c_ddc>;
-		gpios = <&gpio3 16 GPIO_ACTIVE_HIGH /* sda */
-			 &gpio2 30 GPIO_ACTIVE_HIGH /* scl */
-			>;
-		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
-		status = "disabled";
-	};
-
 	reg_1p8v: regulator-1p8v {
 		compatible = "regulator-fixed";
 		regulator-name = "1P8V";
@@ -209,6 +197,12 @@
 	};
 };
 
+&hdmi {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hdmi_ddc>;
+	status = "disabled";
+};
+
 /*
  * GEN1_I2C: I2C1_SDA/SCL on MXM3 209/211 (e.g. RTC on carrier
  * board)
@@ -633,11 +627,10 @@
 		>;
 	};
 
-	pinctrl_i2c_ddc: gpioi2cddcgrp {
+	pinctrl_hdmi_ddc: hdmiddcgrp {
 		fsl,pins = <
-			/* DDC bitbang */
-			MX6QDL_PAD_EIM_EB2__GPIO2_IO30 0x1b0b0
-			MX6QDL_PAD_EIM_D16__GPIO3_IO16 0x1b0b0
+			MX6QDL_PAD_EIM_EB2__HDMI_TX_DDC_SCL 0x4001b8b1
+			MX6QDL_PAD_EIM_D16__HDMI_TX_DDC_SDA 0x4001b8b1
 		>;
 	};
 
-- 
2.9.3

[PATCH v1 2/3] ARM: dts: imx6q-apalis-ixora: Remove use of pwm-leds

[Sanchayan Maity]

Remove use of pwm-leds and use the standard /sys/class/pwm
interface from PWM subsystem.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
 arch/arm/boot/dts/imx6q-apalis-ixora.dts | 22 ----------------------
 1 file changed, 22 deletions(-)

diff --git a/arch/arm/boot/dts/imx6q-apalis-ixora.dts b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
index d99979e..70a3da0 100644
--- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
+++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
@@ -146,28 +146,6 @@
 			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
 		};
 	};
-
-	pwmleds {
-		compatible = "pwm-leds";
-
-		ledpwm1 {
-			label = "PWM1";
-			pwms = <&pwm1 0 50000>;
-			max-brightness = <255>;
-		};
-
-		ledpwm2 {
-			label = "PWM2";
-			pwms = <&pwm2 0 50000>;
-			max-brightness = <255>;
-		};
-
-		ledpwm3 {
-			label = "PWM3";
-			pwms = <&pwm3 0 50000>;
-			max-brightness = <255>;
-		};
-	};
 };
 
 &backlight {
-- 
2.9.3

Re: [PATCH v1 2/3] ARM: dts: imx6q-apalis-ixora: Remove use of pwm-leds

[Stefan Agner]

On 2016-09-13 23:35, Sanchayan Maity wrote:
> Remove use of pwm-leds and use the standard /sys/class/pwm
> interface from PWM subsystem.

Don't we have actual leds on the Ixora?

--
Stefan

> 
> Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
> ---
>  arch/arm/boot/dts/imx6q-apalis-ixora.dts | 22 ----------------------
>  1 file changed, 22 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> index d99979e..70a3da0 100644
> --- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> +++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> @@ -146,28 +146,6 @@
>  			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
>  		};
>  	};
> -
> -	pwmleds {
> -		compatible = "pwm-leds";
> -
> -		ledpwm1 {
> -			label = "PWM1";
> -			pwms = <&pwm1 0 50000>;
> -			max-brightness = <255>;
> -		};
> -
> -		ledpwm2 {
> -			label = "PWM2";
> -			pwms = <&pwm2 0 50000>;
> -			max-brightness = <255>;
> -		};
> -
> -		ledpwm3 {
> -			label = "PWM3";
> -			pwms = <&pwm3 0 50000>;
> -			max-brightness = <255>;
> -		};
> -	};
>  };
>  
>  &backlight {

Re: [PATCH v1 2/3] ARM: dts: imx6q-apalis-ixora: Remove use of pwm-leds

[Marcel Ziswiler]

On Wed, 2016-09-14 at 08:58 -0700, Stefan Agner wrote:
> On 2016-09-13 23:35, Sanchayan Maity wrote:
> > 
> > Remove use of pwm-leds and use the standard /sys/class/pwm
> > interface from PWM subsystem.
> Don't we have actual leds on the Ixora?

Yes, sure, but not really PWM ones:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/ar
ch/arm/boot/dts/imx6q-apalis-ixora.dts?id=refs/tags/v4.8-rc6#n124

Re: [PATCH v1 2/3] ARM: dts: imx6q-apalis-ixora: Remove use of pwm-leds

[Marcel Ziswiler]

On Wed, 2016-09-14 at 12:05 +0530, Sanchayan Maity wrote:
> Remove use of pwm-leds and use the standard /sys/class/pwm
> interface from PWM subsystem.
> 
> Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

> ---
>  arch/arm/boot/dts/imx6q-apalis-ixora.dts | 22 ----------------------
>  1 file changed, 22 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> index d99979e..70a3da0 100644
> --- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> +++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> @@ -146,28 +146,6 @@
>  			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
>  		};
>  	};
> -
> -	pwmleds {
> -		compatible = "pwm-leds";
> -
> -		ledpwm1 {
> -			label = "PWM1";
> -			pwms = <&pwm1 0 50000>;
> -			max-brightness = <255>;
> -		};
> -
> -		ledpwm2 {
> -			label = "PWM2";
> -			pwms = <&pwm2 0 50000>;
> -			max-brightness = <255>;
> -		};
> -
> -		ledpwm3 {
> -			label = "PWM3";
> -			pwms = <&pwm3 0 50000>;
> -			max-brightness = <255>;
> -		};
> -	};
>  };
>  
>  &backlight {

Tested working fine analogous to what we documented for Vybrid:

http://developer.toradex.com/knowledge-base/pwm-(linux)#Colibri_VFxx

[PATCH v1 3/3] ARM: dts: imx6qdl-apalis: Use enable-gpios property for backlight

[Sanchayan Maity]

Use enable-gpios property of PWM backlight driver for backlight
control. While at it also fix the use of brightness levels required
by EDT displays which require inverted PWM's.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
 arch/arm/boot/dts/imx6qdl-apalis.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
index 8c67dd8..9100bde 100644
--- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
@@ -49,7 +49,10 @@
 
 	backlight: backlight {
 		compatible = "pwm-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio_bl_on>;
 		pwms = <&pwm4 0 5000000>;
+		enable-gpios = <&gpio3 13 GPIO_ACTIVE_HIGH>;
 		status = "disabled";
 	};
 
@@ -614,6 +617,12 @@
 		>;
 	};
 
+	pinctrl_gpio_bl_on: gpioblon {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_DA13__GPIO3_IO13 0x1b0b0
+		>;
+	};
+
 	pinctrl_gpio_keys: gpio1io04grp {
 		fsl,pins = <
 			/* Power button */
-- 
2.9.3

Re: [PATCH v1 3/3] ARM: dts: imx6qdl-apalis: Use enable-gpios property for backlight

[Marcel Ziswiler]

On Wed, 2016-09-14 at 12:05 +0530, Sanchayan Maity wrote:
> Use enable-gpios property of PWM backlight driver for backlight
> control. While at it also fix the use of brightness levels required
> by EDT displays which require inverted PWM's.

That part I am missing below. Did you forget to include it?

> Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
> ---
>  arch/arm/boot/dts/imx6qdl-apalis.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> index 8c67dd8..9100bde 100644
> --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> @@ -49,7 +49,10 @@
>  
>  	backlight: backlight {
>  		compatible = "pwm-backlight";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_gpio_bl_on>;
>  		pwms = <&pwm4 0 5000000>;
> +		enable-gpios = <&gpio3 13 GPIO_ACTIVE_HIGH>;
>  		status = "disabled";
>  	};
>  
> @@ -614,6 +617,12 @@
>  		>;
>  	};
>  
> +	pinctrl_gpio_bl_on: gpioblon {
> +		fsl,pins = <
> +			MX6QDL_PAD_EIM_DA13__GPIO3_IO13 0x1b0b0
> +		>;
> +	};
> +
>  	pinctrl_gpio_keys: gpio1io04grp {
>  		fsl,pins = <
>  			/* Power button */

Re: [PATCH v1 3/3] ARM: dts: imx6qdl-apalis: Use enable-gpios property for backlight

[maitysanchayan]

Hello Marcel,

On 16-09-16 13:38:54, Marcel Ziswiler wrote:
> On Wed, 2016-09-14 at 12:05 +0530, Sanchayan Maity wrote:
> > Use enable-gpios property of PWM backlight driver for backlight
> > control. While at it also fix the use of brightness levels required
> > by EDT displays which require inverted PWM's.
> 
> That part I am missing below. Did you forget to include it?

No, actually I missed fixing the commit message. Currently PWM polarity
inversion is not supported and while checking, I kept the brightness
levels as is currently but did not change the commit message.

Will send a v2 and fix this.

Regards,
Sanchayan.

> 
> > Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
> > ---
> >  arch/arm/boot/dts/imx6qdl-apalis.dtsi | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > index 8c67dd8..9100bde 100644
> > --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > @@ -49,7 +49,10 @@
> >  
> >  	backlight: backlight {
> >  		compatible = "pwm-backlight";
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&pinctrl_gpio_bl_on>;
> >  		pwms = <&pwm4 0 5000000>;
> > +		enable-gpios = <&gpio3 13 GPIO_ACTIVE_HIGH>;
> >  		status = "disabled";
> >  	};
> >  
> > @@ -614,6 +617,12 @@
> >  		>;
> >  	};
> >  
> > +	pinctrl_gpio_bl_on: gpioblon {
> > +		fsl,pins = <
> > +			MX6QDL_PAD_EIM_DA13__GPIO3_IO13 0x1b0b0
> > +		>;
> > +	};
> > +
> >  	pinctrl_gpio_keys: gpio1io04grp {
> >  		fsl,pins = <
> >  			/* Power button */

Re: [PATCH v1 1/3] ARM: dts: imx6qdl-apalis: Do not rely on DDC I2C bus bitbang for HDMI

[Marcel Ziswiler]

On Wed, 2016-09-14 at 12:05 +0530, Sanchayan Maity wrote:
> Remove the use of DDC I2C bus bitbang to support reading of EDID
> and rely on support from internal HDMI I2C master controller instead.
> As a result remove the device tree property ddc-i2c-bus.
> 
> Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
> ---
> Hello,
> 
> This patch is tested with the following patch applied
> https://patchwork.kernel.org/patch/9296883/
> 
> and is based on the suggestions from Vladimir
> https://lkml.org/lkml/2016/8/29/322
> 
> This and following two patches are based on top of shawn's
> for-next branch.
> 
> Regards,
> Sanchayan.
> ---
>  arch/arm/boot/dts/imx6q-apalis-ixora.dts |  6 ------
>  arch/arm/boot/dts/imx6qdl-apalis.dtsi    | 25 +++++++++-------------
> ---
>  2 files changed, 9 insertions(+), 22 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> index 207b85b..d99979e 100644
> --- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> +++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
> @@ -55,7 +55,6 @@
>  		     "fsl,imx6q";
>  
>  	aliases {
> -		i2c0 = &i2cddc;
>  		i2c1 = &i2c1;
>  		i2c2 = &i2c2;
>  		i2c3 = &i2c3;

I would suggest rising them up in rank.

> @@ -186,11 +185,6 @@
>  };
>  
>  &hdmi {
> -	ddc-i2c-bus = <&i2cddc>;
> -	status = "okay";
> -};
> -
> -&i2cddc {
>  	status = "okay";
>  };
>  
> diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> index 99e323b..8c67dd8 100644
> --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> @@ -53,18 +53,6 @@
>  		status = "disabled";
>  	};
>  
> -	/* DDC_I2C: I2C2_SDA/SCL on MXM3 205/207 */
> -	i2cddc: i2c@0 {
> -		compatible = "i2c-gpio";
> -		pinctrl-names = "default";
> -		pinctrl-0 = <&pinctrl_i2c_ddc>;
> -		gpios = <&gpio3 16 GPIO_ACTIVE_HIGH /* sda */
> -			 &gpio2 30 GPIO_ACTIVE_HIGH /* scl */
> -			>;
> -		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
> -		status = "disabled";
> -	};
> -
>  	reg_1p8v: regulator-1p8v {
>  		compatible = "regulator-fixed";
>  		regulator-name = "1P8V";
> @@ -209,6 +197,12 @@
>  	};
>  };
>  
> +&hdmi {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_hdmi_ddc>;
> +	status = "disabled";
> +};
> +
>  /*
>   * GEN1_I2C: I2C1_SDA/SCL on MXM3 209/211 (e.g. RTC on carrier
>   * board)
> @@ -633,11 +627,10 @@
>  		>;
>  	};
>  
> -	pinctrl_i2c_ddc: gpioi2cddcgrp {
> +	pinctrl_hdmi_ddc: hdmiddcgrp {
>  		fsl,pins = <
> -			/* DDC bitbang */
> -			MX6QDL_PAD_EIM_EB2__GPIO2_IO30 0x1b0b0
> -			MX6QDL_PAD_EIM_D16__GPIO3_IO16 0x1b0b0
> +			MX6QDL_PAD_EIM_EB2__HDMI_TX_DDC_SCL
> 0x4001b8b1
> +			MX6QDL_PAD_EIM_D16__HDMI_TX_DDC_SDA
> 0x4001b8b1
>  		>;
>  	};
 
Rest looks fine and tested working fine on top of 4.8.0-rc6-next-20160916.