Add new device nodes for Spreadtrum SC9860 platform

This patch set adds charger and fuel gauge device nodes for Spreadtrum SC2731 PMIC, it also removes redundant irq trigger setting for PMIC devices and adds nvmem cells for ADC to calibrate the ADC channel scales.

Baolin Wang (4):
arm64: dts: sprd: Remove PMIC INTC irq trigger type
arm64: dts: sprd: Add ADC calibration support
arm64: dts: sprd: Add SC2731 charger device
arm64: dts: sprd: Add SC27XX fuel gauge device

 arch/arm64/boot/dts/sprd/sc2731.dtsi      |   42 ++++++++++++++++++++++++++---
 arch/arm64/boot/dts/sprd/sp9860g-1h10.dts |   16 +++++++++++
 2 files changed, 54 insertions(+), 4 deletions(-)

1.7.9.5

The Spreadtrum PMIC INTC controller has no registers to set trigger type, since it is always high level trigger as default. So remove its child devices' irq trigger type setting and change #interrupt-cells to 1.

---
 arch/arm64/boot/dts/sprd/sc2731.dtsi |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index 82bd642..f2f2aa5 100644
@@ -13,7 +13,7 @@
 		spi-max-frequency = <26000000>;
 		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-controller;
-		#interrupt-cells = <2>;
+		#interrupt-cells = <1>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 

@@ -43,14 +43,14 @@
 			compatible = "sprd,sc27xx-rtc", "sprd,sc2731-rtc";
 			reg = <0x280>;
 			interrupt-parent = <&sc2731_pmic>;
-			interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <2>;
 		};
 
 		pmic_eic: gpio@300 {
 			compatible = "sprd,sc27xx-eic";
 			reg = <0x300>;
 			interrupt-parent = <&sc2731_pmic>;
-			interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <5>;
 			gpio-controller;
 			#gpio-cells = <2>;
 			interrupt-controller;

@@ -69,7 +69,7 @@
 			compatible = "sprd,sc27xx-adc", "sprd,sc2731-adc";
 			reg = <0x480>;
 			interrupt-parent = <&sc2731_pmic>;
-			interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <0>;
 			#io-channel-cells = <1>;
 			hwlocks = <&hwlock 4>;
 		};

1.7.9.5

This patch adds phandles to the calibration cells provided by the Efuse device, which is used to calibrate the ADC channel scales.

---
 arch/arm64/boot/dts/sprd/sc2731.dtsi |   10 ++++++++++
 1 file changed, 10 insertions(+)

index f2f2aa5..a2edc25 100644
@@ -63,6 +63,14 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 			hwlocks = <&hwlock 12>;
+
+			adc_big_scale: calib@24 {
+				reg = <0x24 0x2>;
+			};
+
+			adc_small_scale: calib@26 {
+				reg = <0x26 0x2>;
+			};
 		};
 
 		pmic_adc: adc@480 {

@@ -72,6 +80,8 @@
 			interrupts = <0>;
 			#io-channel-cells = <1>;
 			hwlocks = <&hwlock 4>;
+			nvmem-cell-names = "big_scale_calib", "small_scale_calib";
+			nvmem-cells = <&adc_big_scale>, <&adc_small_scale>;
 		};
 
 		vibrator@ec8 {

1.7.9.5

Add charger device node and related battery node for SC2731 PMIC.

---
 arch/arm64/boot/dts/sprd/sc2731.dtsi      |    6 ++++++
 arch/arm64/boot/dts/sprd/sp9860g-1h10.dts |   16 ++++++++++++++++
 2 files changed, 22 insertions(+)

index a2edc25..b52eaf0 100644
@@ -17,6 +17,12 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		charger@0 {
+			compatible = "sprd,sc27xx-charger", "sprd,sc2731-charger";
+			reg = <0x0>;
+			monitored-battery = <&bat>;
+		};
+
 		led-controller@200 {
 			compatible = "sprd,sc27xx-bltc", "sprd,sc2731-bltc";
 			reg = <0x200>;

index 3bd18e3..2a963bd 100644
@@ -41,6 +41,22 @@
 		#size-cells = <2>;
 		ranges;
 	};
+
+	bat: battery {
+		compatible = "simple-battery";
+		charge-full-design-microamp-hours = <1900000>;
+		charge-term-current-microamp = <120000>;
+		constant_charge_voltage_max_microvolt = <4350000>;
+		internal-resistance-micro-ohms = <250000>;
+		ocv-capacity-celsius = <20>;
+		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>,
+			<4022000 85>, <3983000 80>, <3949000 75>,
+			<3917000 70>, <3889000 65>, <3864000 60>,
+			<3835000 55>, <3805000 50>, <3787000 45>,
+			<3777000 40>, <3773000 35>, <3770000 30>,
+			<3765000 25>, <3752000 20>, <3724000 15>,
+			<3680000 10>, <3605000 5>, <3400000 0>;
+	};
 };
 
 &uart0 {

1.7.9.5

Add Spreadtrum SC27XX fuel gauge device node to calculate the battery capacity.

---
 arch/arm64/boot/dts/sprd/sc2731.dtsi |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

index b52eaf0..1110d13 100644
@@ -70,6 +70,11 @@
 			#size-cells = <1>;
 			hwlocks = <&hwlock 12>;
 
+			fgu_calib: calib@6 {
+				reg = <0x6 0x2>;
+				bits = <0 9>;
+			};
+
 			adc_big_scale: calib@24 {
 				reg = <0x24 0x2>;
 			};

@@ -90,6 +95,19 @@
 			nvmem-cells = <&adc_big_scale>, <&adc_small_scale>;
 		};
 
+		fgu@a00 {
+			compatible = "sprd,sc27xx-fgu", "sprd,sc2731-fgu";
+			reg = <0xa00>;
+			bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
+			io-channels = <&pmic_adc 3>, <&pmic_adc 6>;
+			io-channel-names = "bat-temp", "charge-vol";
+			monitored-battery = <&bat>;
+			nvmem-cell-names = "fgu_calib";
+			nvmem-cells = <&fgu_calib>;
+			interrupt-parent = <&sc2731_pmic>;
+			interrupts = <4>;
+		};
+
 		vibrator@ec8 {
 			compatible = "sprd,sc27xx-vibrator", "sprd,sc2731-vibrator";
 			reg = <0xec8>;

1.7.9.5

I did not apply these because of the 'sc27xx' wildcard matching.

Please fix those up and resend.

Arnd

Hi Arnd,

On Spreadtrum platform, we use one mfd driver [1] to populate the SC27XX series PMICs including SC2731, SC2721, SC2720 and SC2730. So we use sc27xx to be compatible with different PMICs' devices, otherwise it will be difficult to define the mfd cell arrays in mfd driver. Do you have any good suggestion? Thanks.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mfd/sprd-sc27xx-spi.c

Baolin Wang
Best Regards

You can just list all the individual device names in the of_match_table for the MFD and then it can bind to any of them. You can always map them onto the same behaviour in the MFD driver if they are identical from a software point of view.

Hi Mark,

Sorry for late reply.

If I understood correctly, as you suggested, we should add new mfd_cell groups to list all different PMICs' device names. Something like:

static const struct mfd_cell sprd_pmic_sc2731_devs[] = { {
.name = "sc27xx-wdt",
.of_compatible = "sprd,sc2731-wdt",
}, {
.name = "sc27xx-rtc",
.of_compatible = "sprd,sc2731-rtc",
}, {
.name = "sc27xx-charger",
.of_compatible = "sprd,sc2731-charger",
}, {
.name = "sc27xx-fast-chg",
.of_compatible = "sprd,sc2731-fast-chg",
}, {
.name = "sc27xx-typec",
.of_compatible = "sprd,sc2731-typec",
}, {
.name = "sc27xx-eic",
.of_compatible = "sprd,sc2731-eic",
},

.......

};

static const struct mfd_cell sprd_pmic_sc2730_devs[] = { {
.name = "sc27xx-wdt",
.of_compatible = "sprd,sc2730-wdt",
}, {
.name = "sc27xx-rtc",
.of_compatible = "sprd,sc2730-rtc",
}, {
.name = "sc27xx-charger",
.of_compatible = "sprd,sc2730-charger",
}, {
.name = "sc27xx-fast-chg",
.of_compatible = "sprd,sc2730-fast-chg",
}, {
.name = "sc27xx-typec",
.of_compatible = "sprd,sc2730-typec",
}, {
.name = "sc27xx-eic",
.of_compatible = "sprd,sc2730-eic",
},

.......

};

......

But from my point, they are just some meaningless duplication, and will waste lots of code there.

Baolin Wang
Best Regards

I do think this is a good idea (registering the components of the MFD using mfd_cell), though it wasn't quite the point I was making. Having individual device names matters less for Linux-internal names like this.

I was more thinking of the of_match table that has the IDs that appear in DT - they're the one that's the ABI. Look at something like wm8994 where the driver has several IDs listed in the main table then selects function drivers based on that.

Yes, we can use id_table to populate the PMIC child devices, but some child devices need use the device node to get some resources which are described in DT, so we must specify the of_compabible member of mfd_cell. That means we should use compatible string of the of_match_table to populate the child devices.

So the problem is still there, we should expand the mfd_cell groups to list all device names, but just some meaningless duplication.

--
Baolin Wang
Best Regards