From: Nicolas Ferre <nicolas.ferre@microchip.com>
To: Tudor Ambarus <tudor.ambarus@microchip.com>,
<claudiu.beznea@microchip.com>
Cc: <alexandre.belloni@bootlin.com>, <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
"Mihai Sain" <mihai.sain@microchip.com>
Subject: Re: [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines
Date: Wed, 13 Apr 2022 14:43:42 +0200 [thread overview]
Message-ID: <e6532383-7ab5-f63d-bbe6-cbb45d4943b4@microchip.com> (raw)
In-Reply-To: <20220406130505.422042-1-tudor.ambarus@microchip.com>
On 06/04/2022 at 15:05, Tudor Ambarus wrote:
> The impedance of the QSPI PCB lines on the sama7g5ek is 50 Ohms.
> Align the output impedance of the QSPI0 HSIOs by setting a medium drive
> strength which corresponds to an impedance of 56 Ohms when VDD is in the
> 3.0V - 3.6V range. The high drive strength setting corresponds to an
> output impedance of 42 Ohms on the QSPI0 HSIOs.
>
> Suggested-by: Mihai Sain <mihai.sain@microchip.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Queued in fixes branch for 5.18. Thanks!
Best regards,
Nicolas
> ---
> arch/arm/boot/dts/at91-sama7g5ek.dts | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-sama7g5ek.dts
> index 08685a10eda1..8f9643170ba3 100644
> --- a/arch/arm/boot/dts/at91-sama7g5ek.dts
> +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
> @@ -655,7 +655,7 @@ pinctrl_qspi: qspi {
> <PIN_PB21__QSPI0_INT>;
> bias-disable;
> slew-rate = <0>;
> - atmel,drive-strength = <ATMEL_PIO_DRVSTR_HI>;
> + atmel,drive-strength = <ATMEL_PIO_DRVSTR_ME>;
> };
>
> pinctrl_sdmmc0_default: sdmmc0_default {
--
Nicolas Ferre
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prev parent reply other threads:[~2022-04-13 12:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 13:05 [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines Tudor Ambarus
2022-04-07 6:26 ` Claudiu.Beznea
2022-04-07 7:51 ` Tudor.Ambarus
2022-04-07 8:24 ` Claudiu.Beznea
2022-04-13 12:40 ` Nicolas Ferre
2022-04-13 12:43 ` Nicolas Ferre [this message]
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