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

[Adam Ford <aford173@gmail.com>]

On Wed, Sep 11, 2019 at 12:47 PM H. Nikolaus Schaller <hns@goldelico.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@gmail.com>
> Signed-off-by: H. Nikolaus Schaller <hns@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@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@68000000 {
>                 uart4: serial@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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