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74 lines
2.2 KiB
Diff
74 lines
2.2 KiB
Diff
From 4c0b77276307d2cba8ae2595cbae4cc916c84c36 Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Wed, 15 Sep 2021 10:48:36 +0300
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Subject: [PATCH 233/247] ARM: dts: at91: sama7g5ek: to not touch slew-rate for
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SDMMC pins
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With commit c709135e576b ("pinctrl: at91-pio4: add support for slew-rate")
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and commit cbde6c823bfa ("pinctrl: at91-pio4: Fix slew rate disablement")
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the slew-rate is enabled by default for each configured pin. The datasheet
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specifies at chapter "Output Driver AC Characteristics" that HSIO
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drivers (use in SDMMCx and QSPI0 peripherals), don't have a slewrate
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setting but are rather calibrated against an external 1% resistor mounted
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on the SDMMCx_CAL or QSPI0_CAL pins. Depending on the target signal
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frequency and the external load, it is possible to adjust their target
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output impedance. Thus set slew-rate = <0> for SDMMC (QSPI is not enabled
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at the moment in device tree).
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Fixes: 7540629e2fc7 ("ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek")
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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Link: https://lore.kernel.org/r/20210915074836.6574-3-claudiu.beznea@microchip.com
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---
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arch/arm/boot/dts/at91-sama7g5ek.dts | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/arch/arm/boot/dts/at91-sama7g5ek.dts
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+++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
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@@ -558,6 +558,7 @@
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<PIN_PA8__SDMMC0_DAT5>,
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<PIN_PA9__SDMMC0_DAT6>,
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<PIN_PA10__SDMMC0_DAT7>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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@@ -565,6 +566,7 @@
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pinmux = <PIN_PA0__SDMMC0_CK>,
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<PIN_PA2__SDMMC0_RSTN>,
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<PIN_PA11__SDMMC0_DS>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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};
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@@ -576,6 +578,7 @@
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<PIN_PC0__SDMMC1_DAT1>,
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<PIN_PC1__SDMMC1_DAT2>,
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<PIN_PC2__SDMMC1_DAT3>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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@@ -584,6 +587,7 @@
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<PIN_PB28__SDMMC1_RSTN>,
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<PIN_PC5__SDMMC1_1V8SEL>,
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<PIN_PC4__SDMMC1_CD>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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};
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@@ -595,11 +599,13 @@
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<PIN_PD6__SDMMC2_DAT1>,
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<PIN_PD7__SDMMC2_DAT2>,
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<PIN_PD8__SDMMC2_DAT3>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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ck {
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pinmux = <PIN_PD4__SDMMC2_CK>;
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+ slew-rate = <0>;
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bias-pull-up;
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};
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};
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