linux-kernel - [RFC PATCH] arm64: defconfig: Set MFD_TPS6594

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Message-ID: <20240819204352.1423727-1-jm@ti.com>
Date: Mon, 19 Aug 2024 15:43:52 -0500
From: Judith Mendez <jm@...com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
CC: Bjorn Andersson <quic_bjorande@...cinc.com>,
        Geert Uytterhoeven
	<geert+renesas@...der.be>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Nishanth Menon <nm@...com>, Vignesh
 Raghavendra <vigneshr@...com>,
        Bryan Brattlof <bb@...com>
Subject: [RFC PATCH] arm64: defconfig: Set MFD_TPS6594_I2C as built-in

SK-AM62A-LP is a device targeting automotive front-camera applications
among other use-cases. It utilizes the TPS6593x PMIC (interfaced over I2C)
to power the SoC and various other peripherals on the board [1].

MMCSD requires the PMIC to be setup correctly before setting the bus
pins to 1.8V using the TPS6594 driver interfaced over i2c.

Currently, the following could be seen when booting the am62ax platform:

"platform fa00000.mmc: deferred probe pending: platform: supplier regulator-5 not ready"
"vdd_mmc1: disabling"

and a failure to boot the SK-AM62A-LP.

One solution is to use initramfs [2], but using initramfs increases the
boot time for this automotive solution which requires faster boot time
parameters.

Another solution is to change MFD_TPS6594_I2C to built-in, that way the
PMIC is setup and the regulators are ready before MMCSD switches to UHS
mode, this is the preferred solution since it does not increase boot time
like the initramfs solution does.

[1] https://www.ti.com/lit/zip/sprr459
[2] https://lore.kernel.org/linux-devicetree/5f03207b-c29b-4d16-92b0-d14eef77bf17@linaro.org/
Fixes: f9010eb938be ("arm64: defconfig: Enable TPS6593 PMIC for SK-AM62A")

Signed-off-by: Judith Mendez <jm@...com>
---
 arch/arm64/configs/defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 7d32fca649965..61f767246d3a5 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -756,7 +756,7 @@ CONFIG_RZ_MTU3=y
 CONFIG_MFD_TI_AM335X_TSCADC=m
 CONFIG_MFD_TI_LP873X=m
 CONFIG_MFD_TPS65219=y
-CONFIG_MFD_TPS6594_I2C=m
+CONFIG_MFD_TPS6594_I2C=y
 CONFIG_MFD_ROHM_BD718XX=y
 CONFIG_MFD_WCD934X=m
 CONFIG_MFD_KHADAS_MCU=m

base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b
-- 
2.46.0