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Date: Fri, 13 Sep 2019 16:13:49 -0500
From: Adam Ford <aford173@...il.com>
To: "H. Nikolaus Schaller" <hns@...delico.com>
Cc: Benoît Cousson <bcousson@...libre.com>,
Tony Lindgren <tony@...mide.com>,
Rob Herring <robh+dt@...nel.org>,
André Roth <neolynx@...il.com>,
Mark Rutland <mark.rutland@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
Enric Balletbo i Serra <eballetbo@...il.com>,
Javier Martinez Canillas <javier@...hile0.org>,
Roger Quadros <rogerq@...com>,
Teresa Remmet <t.remmet@...tec.de>,
Linux-OMAP <linux-omap@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-pm@...r.kernel.org,
Discussions about the Letux Kernel
<letux-kernel@...nphoenux.org>, kernel@...a-handheld.com,
arm-soc <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 6/8] ARM: dts: omap36xx: using OPP1G needs to control
the abb_ldo
On Wed, Sep 11, 2019 at 12:47 PM H. Nikolaus Schaller <hns@...delico.com> wrote:
>
> 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@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@...il.com>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.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@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;
If / when the thermal changes I submitted get approved, would you
entertain dropping this turbo-mode flag so it's enabled by default?
adam
> };
> };
>
> + opp_supply_mpu_iva: opp_supply {
> + compatible = "ti,omap-opp-supply";
> + ti,absolute-max-voltage-uv = <1375000>;
> + };
> +
> ocp@...00000 {
> uart4: serial@...42000 {
> 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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