[PATCH 0/3] arm: lpc32xx: remove direct control of GPIOs from shared mach file

[PATCH 0/3] arm: lpc32xx: remove direct control of GPIOs from shared mach file

[Vladimir Zapolskiy]

The change moves GPIO controlled voltage regulators from
mach-lpc32xx/phy3250.c to Phytec PHY3250 DTS board file.

The change makes previous versions of PHY3250 DTB incompatible with
the new kernel version, however the change is needed, because regardless
of its name mach-lpc32xx/phy3250.c file is a common file for all
NXP LPC32xx boards and PHY3250 specifics are not needed there.

Vladimir Zapolskiy (3):
  arm: dts: phy3250: add lcd and backlight fixed regulators
  arm: dts: phy3250: add SD fixed regulator
  arm: lpc32xx: remove direct control of GPIOs from shared mach file

 arch/arm/boot/dts/phy3250.dts   | 32 +++++++++++++++++++++++++
 arch/arm/mach-lpc32xx/phy3250.c | 52 -----------------------------------------
 2 files changed, 32 insertions(+), 52 deletions(-)

-- 
2.1.4

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[PATCH 1/3] arm: dts: phy3250: add lcd and backlight fixed regulators

[Vladimir Zapolskiy]

Phytec PHY3250 board has GPIO controlled regulators for LCD and
backlight, add their descriptions to board DTS file.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/phy3250.dts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
index 7d253bb..34e15fd 100644
--- a/arch/arm/boot/dts/phy3250.dts
+++ b/arch/arm/boot/dts/phy3250.dts
@@ -25,6 +25,28 @@
 		reg = <0x80000000 0x4000000>;
 	};
 
+	regulators {
+		backlight_reg: fixed-regulator@0 {
+			compatible = "regulator-fixed";
+			regulator-name = "backlight_reg";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			gpio = <&gpio 5 4 0>;
+			enable-active-high;
+			regulator-boot-on;
+		};
+
+		lcd_reg: fixed-regulator@1 {
+			compatible = "regulator-fixed";
+			regulator-name = "lcd_reg";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			gpio = <&gpio 5 0 0>;
+			enable-active-high;
+			regulator-boot-on;
+		};
+	};
+
 	ahb {
 		mac: ethernet@31060000 {
 			phy-mode = "rmii";
-- 
2.1.4

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[PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Vladimir Zapolskiy]

The change adds fixed voltage regulator for SD controller, ARM MMCI
controller driver uses it to control card power management.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/phy3250.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
index 34e15fd..5465b9e 100644
--- a/arch/arm/boot/dts/phy3250.dts
+++ b/arch/arm/boot/dts/phy3250.dts
@@ -45,6 +45,15 @@
 			enable-active-high;
 			regulator-boot-on;
 		};
+
+		sd_reg: fixed-regulator@2 {
+			compatible = "regulator-fixed";
+			regulator-name = "sd_reg";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			gpio = <&gpio 5 5 0>;
+			enable-active-high;
+		};
 	};
 
 	ahb {
@@ -162,6 +171,7 @@
 				cd-gpios = <&gpio 3 1 0>;
 				cd-inverted;
 				bus-width = <4>;
+				vqmmc-supply = <&sd_reg>;
 				status = "okay";
 			};
 		};
-- 
2.1.4

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[PATCH 3/3] arm: lpc32xx: remove direct control of GPIOs from shared mach file

[Vladimir Zapolskiy]

The change removes GPIO configuration and control of LCD, backlight
and SD voltage regulators from the shared among all LPC32xx boards
mach file, Phytec PHY3250 board should have the description of these
regulators in its DTS file.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
---
 arch/arm/mach-lpc32xx/phy3250.c | 52 -----------------------------------------
 1 file changed, 52 deletions(-)

diff --git a/arch/arm/mach-lpc32xx/phy3250.c b/arch/arm/mach-lpc32xx/phy3250.c
index 77d6b1b..0bdfa08 100644
--- a/arch/arm/mach-lpc32xx/phy3250.c
+++ b/arch/arm/mach-lpc32xx/phy3250.c
@@ -36,7 +36,6 @@
 #include <linux/clk.h>
 #include <linux/mtd/lpc32xx_slc.h>
 #include <linux/mtd/lpc32xx_mlc.h>
-#include <linux/platform_data/gpio-lpc32xx.h>
 
 #include <asm/setup.h>
 #include <asm/mach-types.h>
@@ -48,13 +47,6 @@
 #include "common.h"
 
 /*
- * Mapped GPIOLIB GPIOs
- */
-#define LCD_POWER_GPIO		LPC32XX_GPIO(LPC32XX_GPO_P3_GRP, 0)
-#define BKL_POWER_GPIO		LPC32XX_GPIO(LPC32XX_GPO_P3_GRP, 4)
-#define MMC_PWR_ENABLE_GPIO	LPC32XX_GPIO(LPC32XX_GPO_P3_GRP, 5)
-
-/*
  * AMBA LCD controller
  */
 static struct clcd_panel conn_lcd_panel = {
@@ -97,20 +89,6 @@ static int lpc32xx_clcd_setup(struct clcd_fb *fb)
 	fb->fb.fix.smem_len = PANEL_SIZE;
 	fb->panel = &conn_lcd_panel;
 
-	if (gpio_request(LCD_POWER_GPIO, "LCD power"))
-		printk(KERN_ERR "Error requesting gpio %u",
-			LCD_POWER_GPIO);
-	else if (gpio_direction_output(LCD_POWER_GPIO, 1))
-		printk(KERN_ERR "Error setting gpio %u to output",
-			LCD_POWER_GPIO);
-
-	if (gpio_request(BKL_POWER_GPIO, "LCD backlight power"))
-		printk(KERN_ERR "Error requesting gpio %u",
-			BKL_POWER_GPIO);
-	else if (gpio_direction_output(BKL_POWER_GPIO, 1))
-		printk(KERN_ERR "Error setting gpio %u to output",
-			BKL_POWER_GPIO);
-
 	return 0;
 }
 
@@ -127,29 +105,10 @@ static void lpc32xx_clcd_remove(struct clcd_fb *fb)
 		fb->fb.screen_base, fb->fb.fix.smem_start);
 }
 
-/*
- * On some early LCD modules (1307.0), the backlight logic is inverted.
- * For those board variants, swap the disable and enable states for
- * BKL_POWER_GPIO.
-*/
-static void clcd_disable(struct clcd_fb *fb)
-{
-	gpio_set_value(BKL_POWER_GPIO, 0);
-	gpio_set_value(LCD_POWER_GPIO, 0);
-}
-
-static void clcd_enable(struct clcd_fb *fb)
-{
-	gpio_set_value(BKL_POWER_GPIO, 1);
-	gpio_set_value(LCD_POWER_GPIO, 1);
-}
-
 static struct clcd_board lpc32xx_clcd_data = {
 	.name		= "Phytec LCD",
 	.check		= clcdfb_check,
 	.decode		= clcdfb_decode,
-	.disable	= clcd_disable,
-	.enable		= clcd_enable,
 	.setup		= lpc32xx_clcd_setup,
 	.mmap		= lpc32xx_clcd_mmap,
 	.remove		= lpc32xx_clcd_remove,
@@ -188,20 +147,9 @@ static struct pl08x_platform_data pl08x_pd = {
 	.mem_buses = PL08X_AHB1,
 };
 
-static int mmc_handle_ios(struct device *dev, struct mmc_ios *ios)
-{
-	/* Only on and off are supported */
-	if (ios->power_mode == MMC_POWER_OFF)
-		gpio_set_value(MMC_PWR_ENABLE_GPIO, 0);
-	else
-		gpio_set_value(MMC_PWR_ENABLE_GPIO, 1);
-	return 0;
-}
-
 static struct mmci_platform_data lpc32xx_mmci_data = {
 	.ocr_mask	= MMC_VDD_30_31 | MMC_VDD_31_32 |
 			  MMC_VDD_32_33 | MMC_VDD_33_34,
-	.ios_handler	= mmc_handle_ios,
 };
 
 static struct lpc32xx_slc_platform_data lpc32xx_slc_data = {
-- 
2.1.4

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Re: [PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Russell King - ARM Linux]

On Sun, Dec 20, 2015 at 01:32:11AM +0200, Vladimir Zapolskiy wrote:
> @@ -162,6 +171,7 @@
>  				cd-gpios = <&gpio 3 1 0>;
>  				cd-inverted;
>  				bus-width = <4>;
> +				vqmmc-supply = <&sd_reg>;

This looks wrong.  ios->power_mode controls the _card_ power (which is
vmmc-supply), not the signalling power (which is vqmmc-supply):

- vmmc-supply            : phandle to the regulator device tree node, mentioned
                           as the VCC/VDD supply in the eMMC/SD specs.

- vqmmc-supply           : phandle to the regulator device tree node, mentioned
                           as the VCCQ/VDD_IO supply in the eMMC/SD specs.


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Re: [PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Vladimir Zapolskiy]

On 20.12.2015 01:48, Russell King - ARM Linux wrote:
> On Sun, Dec 20, 2015 at 01:32:11AM +0200, Vladimir Zapolskiy wrote:
>> @@ -162,6 +171,7 @@
>>  				cd-gpios = <&gpio 3 1 0>;
>>  				cd-inverted;
>>  				bus-width = <4>;
>> +				vqmmc-supply = <&sd_reg>;
> 
> This looks wrong.  ios->power_mode controls the _card_ power (which is
> vmmc-supply), not the signalling power (which is vqmmc-supply):

>From drivers/mmc/host/mmci.c mmci_set_ios() manages both regulators,
mmc->supply.vmmc is changed on MMC_POWER_OFF and MMC_POWER_UP,
mmc->supply.vqmmc is changed on MMC_POWER_OFF and MMC_POWER_ON.

But I agree that vmmc-supply is the right choice here, GPIO regulator
controls an SD card power here, thanks for the finding.

> - vmmc-supply            : phandle to the regulator device tree node, mentioned
>                            as the VCC/VDD supply in the eMMC/SD specs.
> 
> - vqmmc-supply           : phandle to the regulator device tree node, mentioned
>                            as the VCCQ/VDD_IO supply in the eMMC/SD specs.
> 
> 

--
With best wishes,
Vladimir
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[PATCH v2 2/3] arm: dts: phy3250: add SD fixed regulator

[Vladimir Zapolskiy]

The change adds fixed voltage regulator for SD controller, ARM MMCI
controller driver uses it to control card power management.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
---
Changes from v1 to v2:
* specify SD card power supply instead of signal power, thanks to Russell

 arch/arm/boot/dts/phy3250.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
index 34e15fd..bcb87b3 100644
--- a/arch/arm/boot/dts/phy3250.dts
+++ b/arch/arm/boot/dts/phy3250.dts
@@ -45,6 +45,15 @@
 			enable-active-high;
 			regulator-boot-on;
 		};
+
+		sd_reg: fixed-regulator@2 {
+			compatible = "regulator-fixed";
+			regulator-name = "sd_reg";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			gpio = <&gpio 5 5 0>;
+			enable-active-high;
+		};
 	};
 
 	ahb {
@@ -162,6 +171,7 @@
 				cd-gpios = <&gpio 3 1 0>;
 				cd-inverted;
 				bus-width = <4>;
+				vmmc-supply = <&sd_reg>;
 				status = "okay";
 			};
 		};
-- 
2.1.4

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Re: [PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Sergei Shtylyov]

Hello.

On 12/20/2015 2:32 AM, Vladimir Zapolskiy wrote:

> The change adds fixed voltage regulator for SD controller, ARM MMCI
> controller driver uses it to control card power management.
>
> Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
> ---
>   arch/arm/boot/dts/phy3250.dts | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
> index 34e15fd..5465b9e 100644
> --- a/arch/arm/boot/dts/phy3250.dts
> +++ b/arch/arm/boot/dts/phy3250.dts
> @@ -45,6 +45,15 @@
>   			enable-active-high;
>   			regulator-boot-on;
>   		};
> +
> +		sd_reg: fixed-regulator@2 {

    Please just "regulator@2", to comply with the ePAPR standard.

[...]

MBR, Sergei

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Re: [PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Vladimir Zapolskiy]

Hell Sergei,

On 21.12.2015 14:43, Sergei Shtylyov wrote:
> Hello.
> 
> On 12/20/2015 2:32 AM, Vladimir Zapolskiy wrote:
> 
>> The change adds fixed voltage regulator for SD controller, ARM MMCI
>> controller driver uses it to control card power management.
>>
>> Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
>> ---
>>   arch/arm/boot/dts/phy3250.dts | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
>> index 34e15fd..5465b9e 100644
>> --- a/arch/arm/boot/dts/phy3250.dts
>> +++ b/arch/arm/boot/dts/phy3250.dts
>> @@ -45,6 +45,15 @@
>>   			enable-active-high;
>>   			regulator-boot-on;
>>   		};
>> +
>> +		sd_reg: fixed-regulator@2 {
> 
>     Please just "regulator@2", to comply with the ePAPR standard.

thanks for review, just for my information, do I understand correctly
that you reference to "Generic Names Recommendation" ?

I have no objection to generalize device tree node name as you
suggested, will do it.

With best wishes,
Vladimir
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Re: [PATCH 2/3] arm: dts: phy3250: add SD fixed regulator

[Sergei Shtylyov]

On 12/21/2015 07:58 PM, Vladimir Zapolskiy wrote:

>>> The change adds fixed voltage regulator for SD controller, ARM MMCI
>>> controller driver uses it to control card power management.
>>>
>>> Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
>>> ---
>>>    arch/arm/boot/dts/phy3250.dts | 10 ++++++++++
>>>    1 file changed, 10 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/phy3250.dts b/arch/arm/boot/dts/phy3250.dts
>>> index 34e15fd..5465b9e 100644
>>> --- a/arch/arm/boot/dts/phy3250.dts
>>> +++ b/arch/arm/boot/dts/phy3250.dts
>>> @@ -45,6 +45,15 @@
>>>    			enable-active-high;
>>>    			regulator-boot-on;
>>>    		};
>>> +
>>> +		sd_reg: fixed-regulator@2 {
>>
>>      Please just "regulator@2", to comply with the ePAPR standard.
>
> thanks for review, just for my information, do I understand correctly
> that you reference to "Generic Names Recommendation" ?

    Sure, AKA 2.2.2. :-)

> I have no objection to generalize device tree node name as you
> suggested, will do it.

    TIA.

> With best wishes,
> Vladimir

MBR, Sergei

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