[Letux-kernel] [PATCH v3 6/8] ARM: dts: omap36xx: using OPP1G needs to control the abb_ldo

H. Nikolaus Schaller hns at goldelico.com
Wed Sep 11 19:47:12 CEST 2019


See DM3730,DM275 data sheet (SPRS685B) footnote (6) in Table 4-19
which says that ABB must be switched to FBB mode when using the
OPP1G.

The LOD definition abb_mpu_iva already exists so that we need
to add plumbing for vbb-supply = <&abb_mpu_iva>
and define two voltage vectors for each OPP so that the abb LDO
is also updated by the ti-cpufreq driver.

We also must switch the ti_cpufreq_soc_data to multi_regulator.

Note: reading out the abb reglator voltage to verify that
it does do transitions can be done by

cat /sys/devices/platform/68000000.ocp/483072f0.regulator-abb-mpu/regulator/regulator.*/microvolts

Likewise, read the twl4030 provided VDD voltage by

cat /sys/devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl at 48:regulator-vdd1/regulator/regulator.*/microvolts

Note: to check if the ABB FBB is enabled/disabled, check
registers

PRM_LDO_ABB_CTRL 0x483072F4 bit 3:0 1=bypass 5=FBB
PRM_LDO_ABB_SETUP 0x483072F0 0x00=bypass 0x11=FBB

e.g.

/dev/mem opened.
Memory mapped at address 0xb6fe4000.
Value at address 0x483072F4 (0xb6fe42f4): 0x3205
/dev/mem opened.
Memory mapped at address 0xb6f89000.
Value at address 0x483072F4 (0xb6f892f4): 0x3201

Note: omap34xx and am3517 have/need no comparable LDO
or mechanism.

Suggested-by: Adam Ford <aford173 at gmail.com>
Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
---
 arch/arm/boot/dts/omap36xx.dtsi | 21 ++++++++++++++++-----
 drivers/cpufreq/ti-cpufreq.c    |  2 +-
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/arch/arm/boot/dts/omap36xx.dtsi b/arch/arm/boot/dts/omap36xx.dtsi
index cb5bd0969124..4bb4f534afe2 100644
--- a/arch/arm/boot/dts/omap36xx.dtsi
+++ b/arch/arm/boot/dts/omap36xx.dtsi
@@ -23,6 +23,7 @@
 		cpu: cpu at 0 {
 			operating-points-v2 = <&cpu0_opp_table>;
 
+			vbb-supply = <&abb_mpu_iva>;
 			clock-latency = <300000>; /* From omap-cpufreq driver */
 		};
 	};
@@ -37,9 +38,11 @@
 			/*
 			 * we currently only select the max voltage from table
 			 * Table 4-19 of the DM3730 Data sheet (SPRS685B)
-			 * Format is: <target min max>
+			 * Format is:	cpu0-supply:	<target min max>
+			 *		vbb-supply:	<target min max>
 			 */
-			opp-microvolt = <1012500 1012500 1012500>;
+			opp-microvolt = <1012500 1012500 1012500>,
+					 <1012500 1012500 1012500>;
 			/*
 			 * first value is silicon revision bit mask
 			 * second one is "speed binned" bit mask
@@ -50,25 +53,33 @@
 
 		opp100-600000000 {
 			opp-hz = /bits/ 64 <600000000>;
-			opp-microvolt = <1200000 1200000 1200000>;
+			opp-microvolt = <1200000 1200000 1200000>,
+					 <1200000 1200000 1200000>;
 			opp-supported-hw = <0xffffffff 3>;
 		};
 
 		opp130-800000000 {
 			opp-hz = /bits/ 64 <800000000>;
-			opp-microvolt = <1325000 1325000 1325000>;
+			opp-microvolt = <1325000 1325000 1325000>,
+					 <1325000 1325000 1325000>;
 			opp-supported-hw = <0xffffffff 3>;
 		};
 
 		opp1g-1000000000 {
 			opp-hz = /bits/ 64 <1000000000>;
-			opp-microvolt = <1375000 1375000 1375000>;
+			opp-microvolt = <1375000 1375000 1375000>,
+					 <1375000 1375000 1375000>;
 			/* only on am/dm37x with speed-binned bit set */
 			opp-supported-hw = <0xffffffff 2>;
 			turbo-mode;
 		};
 	};
 
+	opp_supply_mpu_iva: opp_supply {
+		compatible = "ti,omap-opp-supply";
+		ti,absolute-max-voltage-uv = <1375000>;
+	};
+
 	ocp at 68000000 {
 		uart4: serial at 49042000 {
 			compatible = "ti,omap3-uart";
diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
index 1a3073a3093e..f4704f9033e0 100644
--- a/drivers/cpufreq/ti-cpufreq.c
+++ b/drivers/cpufreq/ti-cpufreq.c
@@ -174,7 +174,7 @@ static struct ti_cpufreq_soc_data omap36xx_soc_data = {
 	.efuse_shift = 9,
 	.efuse_mask = BIT(9),
 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
-	.multi_regulator = false,
+	.multi_regulator = true,
 };
 
 /**
-- 
2.19.1



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