From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Ayush Singh <ayushdevel1325@gmail.com>,
linux-kernel@vger.kernel.org, jkridner@beagleboard.org,
robertcnelson@beagleboard.org,
Vaishnav M A <vaishnav@beagleboard.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>, Nishanth Menon <nm@ti.com>,
Vignesh Raghavendra <vigneshr@ti.com>,
Tero Kristo <kristo@kernel.org>,
Derek Kiernan <derek.kiernan@amd.com>,
Dragan Cvetic <dragan.cvetic@amd.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Jiri Slaby <jirislaby@kernel.org>,
Johan Hovold <johan@kernel.org>, Alex Elder <elder@kernel.org>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-spi@vger.kernel.org, linux-serial@vger.kernel.org,
greybus-dev@lists.linaro.org
Subject: Re: [PATCH v3 1/8] dt-bindings: misc: Add mikrobus-connector
Date: Fri, 15 Mar 2024 20:20:08 +0000 [thread overview]
Message-ID: <ZfSteEmeQX5IUJnU@shell.armlinux.org.uk> (raw)
In-Reply-To: <314a88e0-19cd-4b95-9cf3-aef1c7579eec@linaro.org>
On Fri, Mar 15, 2024 at 09:09:11PM +0100, Krzysztof Kozlowski wrote:
> > +properties:
> > + compatible:
> > + const: mikrobus-connector
>
> Hm, why do you create binding for the connector, not for some sort of
> controller? Please provide some rationale for this in commit msg.
I think you have a distorted view. I refer you to the Mikroe mikroBUS
specification - it's _just_ a connector which provides a fairly
standardised purpose for each pin and the electrical specifications.
For example of the pins: power, UART, SPIs, I2C, PWM, and analogue
pins.
> > + pinctrl-names:
> > + items:
> > + - const: default
> > + - const: pwm_default
> > + - const: pwm_gpio
> > + - const: uart_default
> > + - const: uart_gpio
> > + - const: i2c_default
> > + - const: i2c_gpio
> > + - const: spi_default
> > + - const: spi_gpio
>
> I fail to see why such choice is related to the connector itself.
This isn't a choice at all. Here's the list of pins:
Analog - AN
Reset - RST
SPI Chip Select - CS
SPI Clock - SCK
SPI Master Input Slave Output - MISO
SPI Master Output Slave Input - MOSI
VCC-3.3V power - +3.3V
Reference Ground - GND
PWM - PWM output
INT - Hardware Interrupt
RX - UART Receive
TX - UART Transmit
SCL - I2C Clock
SDA - I2C Data
+5V - VCC-5V power
GND - Reference Ground
Any data pin can be a GPIO if e.g. a relay board is plugged in, even
if some of the other pins are used for e.g. UART purposes. For example,
a GPS board that provides the GPS data over the UART pins, and the
PPS signal through a different pin.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2024-03-15 20:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-15 18:48 [PATCH v3 0/8] misc: Add mikroBUS driver Ayush Singh
2024-03-15 18:48 ` [PATCH v3 1/8] dt-bindings: misc: Add mikrobus-connector Ayush Singh
2024-03-15 20:09 ` Krzysztof Kozlowski
2024-03-15 20:20 ` Russell King (Oracle) [this message]
2024-03-15 20:40 ` Krzysztof Kozlowski
2024-03-15 21:00 ` Russell King (Oracle)
2024-03-17 20:59 ` Rob Herring
2024-03-18 12:37 ` Ayush Singh
2024-03-15 18:49 ` [PATCH v3 2/8] w1: Add w1_find_master_device Ayush Singh
2024-03-15 19:40 ` Russell King (Oracle)
2024-03-15 20:14 ` Krzysztof Kozlowski
2024-03-15 18:49 ` [PATCH v3 3/8] spi: Make of_find_spi_controller_by_node() available Ayush Singh
2024-03-15 18:49 ` [PATCH v3 4/8] serdev: add of_ helper to get serdev controller Ayush Singh
2024-03-15 20:16 ` Krzysztof Kozlowski
2024-03-15 18:49 ` [PATCH v3 5/8] regulator: fixed-helper: export regulator_register_always_on Ayush Singh
2024-03-15 18:49 ` [PATCH v3 6/8] greybus: Add mikroBUS manifest types Ayush Singh
2024-04-11 12:03 ` Greg Kroah-Hartman
2024-03-15 18:49 ` [PATCH v3 7/8] mikrobus: Add mikrobus driver Ayush Singh
2024-03-15 19:03 ` Mark Brown
2024-03-15 19:32 ` Russell King (Oracle)
[not found] ` <46ba778a-5966-4b99-b820-f0d047a56227@gmail.com>
2024-03-15 21:19 ` Russell King (Oracle)
2024-03-15 22:10 ` Vaishnav Achath
2024-03-15 20:35 ` Krzysztof Kozlowski
2024-03-16 13:06 ` Ayush Singh
2024-03-19 5:32 ` Krzysztof Kozlowski
2024-03-19 6:59 ` Ayush Singh
2024-03-20 11:56 ` Krzysztof Kozlowski
2024-03-16 8:18 ` kernel test robot
2024-03-16 9:00 ` kernel test robot
2024-03-15 18:49 ` [PATCH v3 8/8] dts: ti: k3-am625-beagleplay: Add mikroBUS Ayush Singh
2024-03-15 20:20 ` Krzysztof Kozlowski
2024-03-15 21:20 ` [PATCH v3 0/8] misc: Add mikroBUS driver Vaishnav M A
2024-03-15 21:41 ` Ayush Singh
2024-03-15 22:24 ` Vaishnav Achath
2024-03-17 14:41 ` Andrew Lunn
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