From: Andrew Lunn <andrew@lunn.ch>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: netdev@vger.kernel.org, Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Dan Murphy <dmurphy@ti.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 1/3] dt-bindings: dp83867: add binding for io_impedance_ctrl nvmem cell
Date: Tue, 14 Jun 2022 20:46:48 +0200 [thread overview]
Message-ID: <YqjXmInBfE/oMc4m@lunn.ch> (raw)
In-Reply-To: <20220606202220.1670714-2-linux@rasmusvillemoes.dk>
On Mon, Jun 06, 2022 at 10:22:18PM +0200, Rasmus Villemoes wrote:
> We have a board where measurements indicate that the current three
> options - leaving IO_IMPEDANCE_CTRL at the (factory calibrated) reset
> value or using one of the two boolean properties to set it to the
> min/max value - are too coarse.
>
> There is no documented mapping from the 32 possible values of the
> IO_IMPEDANCE_CTRL field to values in the range 35-70 ohms, and the
> exact mapping is likely to vary from chip to chip. So add a DT binding
> for an nvmem cell which can be populated during production with a
> value suitable for each specific board.
>
> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
next prev parent reply other threads:[~2022-06-14 18:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-06 20:22 [PATCH net-next 0/3] net: phy: dp83867: add binding and support for io_impedance_ctrl nvmem cell Rasmus Villemoes
2022-06-06 20:22 ` [PATCH net-next 1/3] dt-bindings: dp83867: add binding " Rasmus Villemoes
2022-06-06 21:58 ` Andrew Lunn
2022-06-07 11:54 ` Rasmus Villemoes
2022-06-14 5:40 ` Jakub Kicinski
2022-06-09 20:04 ` Rob Herring
2022-06-14 18:46 ` Andrew Lunn [this message]
2022-06-06 20:22 ` [PATCH net-next 2/3] linux/phy.h: add phydev_err_probe() wrapper for dev_err_probe() Rasmus Villemoes
2022-06-06 20:22 ` [PATCH net-next 3/3] net: phy: dp83867: implement support for io_impedance_ctrl nvmem cell Rasmus Villemoes
2022-06-14 8:46 ` [PATCH net-next v2 0/3] dt-bindings: dp83867: add binding " Rasmus Villemoes
2022-06-14 8:46 ` [PATCH net-next v2 1/3] " Rasmus Villemoes
2022-06-14 8:46 ` [PATCH net-next v2 2/3] linux/phy.h: add phydev_err_probe() wrapper for dev_err_probe() Rasmus Villemoes
2022-06-14 8:46 ` [PATCH net-next v2 3/3] net: phy: dp83867: implement support for io_impedance_ctrl nvmem cell Rasmus Villemoes
2022-06-17 3:50 ` [PATCH net-next v2 0/3] dt-bindings: dp83867: add binding " patchwork-bot+netdevbpf
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