Re: [PATCH v7 3/3] arm64: dts: ti: k3-j7200: Add support for higher speed modes and update delay select values for MMCSD subsystems

Hi Nishanth,

On 22/03/21 9:05 pm, Nishanth Menon wrote:

On 18:42-20210322, Aswath Govindraju wrote:

quoted

The following speed modes are now supported in J7200 SoC,
- HS200 and HS400 modes at 1.8 V card voltage, in MMCSD0 subsystem [1].
- UHS-I speed modes in MMCSD1 subsystem [1].

Add support for UHS-I modes by adding voltage regulator device tree nodes
and corresponding pinmux details, to power cycle and voltage switch cards.
Set respective tags in sdhci0 and remove no-1-8-v tag from sdhci1
device tree nodes.

Also update the delay values for various speed modes supported, based on
the revised january 2021 J7200 datasheet[2].

[1] - section 12.3.6.1.1 MMCSD Features, in
      https://www.ti.com/lit/ug/spruiu1a/spruiu1a.pdf,
      (SPRUIU1A – JULY 2020 – REVISED JANUARY 2021)

[2] - https://www.ti.com/lit/ds/symlink/dra821u.pdf,
      (SPRSP57B – APRIL 2020 – REVISED JANUARY 2021)

Signed-off-by: Aswath Govindraju <redacted>
---
 .../dts/ti/k3-j7200-common-proc-board.dts     | 42 +++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-j7200-main.dtsi     | 14 ++++++-
 2 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
index b493f939b09a..de8c06bdc825 100644
--- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts

@@ -16,6 +16,29 @@
 		stdout-path = "serial2:115200n8";
 		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
 	};
+
+	vdd_mmc1: fixedregulator-sd {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_mmc1";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		enable-active-high;
+		gpios = <&exp2 2 GPIO_ACTIVE_HIGH>;

is that gpio ?

Yes, that is correct. I'll correct it in the respin

I'd encourage to use vin-supply as well.

Will add this in respin.

quoted

+	};
+
+	vdd_sd_dv: gpio-regulator-vdd-sd-dv {

	What does this drive? TLV71033 ?

Yes, this node models the TLV71033 voltage regulator that switches the
MMC IO signal voltage level between 3.3V and 1.8V.

quoted

+		compatible = "regulator-gpio";
+		regulator-name = "vdd_sd_dv";
+		pinctrl-names = "default";
+		pinctrl-0 = <&vdd_sd_dv_pins_default>;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;

normally, I'd encourage to use vin-supply as well.

Will add this in the respin

quoted

+		gpios = <&main_gpio0 55 GPIO_ACTIVE_HIGH>;
+		states = <1800000 0x0
+			  3300000 0x1>;

states = <1800000 0x0>,
<3300000 0x1>;

Will make this change in the respin.

Can you look at j721e as reference?

Will make changes accordingly.

quoted

+	};
 };
 

Kishon,
	can you look closer at this series?

I'll wait for kishon's feedback and then post respin of this series.


Thank you for the review.

Regards,
Aswath