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Date: Thu, 21 May 2020 17:34:58 +0300 From: Grygorii Strashko <grygorii.strashko@...com> To: Drew Fustini <drew@...gleboard.org>, Linus Walleij <linus.walleij@...aro.org>, BenoƮt Cousson <bcousson@...libre.com>, Tony Lindgren <tony@...mide.com>, Rob Herring <robh+dt@...nel.org>, Linux-OMAP <linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Jason Kridner <jkridner@...gleboard.org>, Robert Nelson <robertcnelson@...gleboard.org> Subject: Re: [PATCH v2] arm: dts: am33xx-bone-common: add gpio-line-names On 21/05/2020 00:47, Drew Fustini wrote: > Add gpio-line-names properties to the GPIO controller nodes. > > BeagleBone boards have P8 and P9 headers [0] which expose many of the > AM3358 ZCZ SoC balls to stacking expansion boards called "capes", or to > other external connections like jumper wires connected to a breadboard. > BeagleBone users will often refer to the "Cape Exanpsion Headers" pin > diagram [1] as it is in the "Bone101" getting started tutorial. [2] > > Most of the P8 and P9 header pins can muxed to a GPIO line. The > gpio-line-names describe which P8 or P9 pin that line goes to and the > default mux for that P8 or P9 pin if it is not GPIO. > > For example, gpiochip 1 line 0 is connected to P8 header pin 25 (P8_25) > however the default device tree has the corresponding BGA ball (ZCZ U7) > muxed to mmc1_dat0 as it is used for the on-board eMMC chip. For that > GPIO line to be used, one would need to modify the device tree to > disable the eMMC and change the pin mux for that ball to GPIO mode. > > Some of the AM3358 ZCZ balls corresponding to GPIO lines are not routed > to a P8 or P9 header, but are instead wired to some peripheral device > like on-board eMMC, HDMI framer IC, or status LEDs. Those names are in > brackets to denote those GPIO lines can not be used. > > Some GPIO lines are named "[NC]" as the corresponding balls are not > routed to anything on the PCB. > > The goal for these names is to make it easier for a user viewing the > output of gpioinfo to determine which P8 or P9 pin is connected to a > GPIO line. The output of gpioinfo on a BeagleBone Black would be: > > debian@...glebone:~$ gpioinfo > gpiochip0 - 32 lines: > line 0: "[ethernet]" unused input active-high > line 1: "[ethernet]" unused input active-high > line 2: "P9_22 [spi0_sclk]" unused input active-high > line 3: "P9_21 [spi0_d0]" unused input active-high > line 4: "P9_18 [spi0_d1]" unused input active-high > line 5: "P9_17 [spi0_cs0]" unused input active-high > line 6: "[sd card]" "cd" input active-low [used] > line 7: "P9_42A [ecappwm0]" unused input active-high > line 8: "P8_35 [hdmi]" unused input active-high > line 9: "P8_33 [hdmi]" unused input active-high > line 10: "P8_31 [hdmi]" unused input active-high > line 11: "P8_32 [hdmi]" unused input active-high [...] > > [0] https://git.io/JfgOd > [1] https://beagleboard.org/capes > [1] https://beagleboard.org/Support/bone101 > [2] https://beagleboard.org/static/images/cape-headers.png > > Reviewed-by: Jason Kridner <jason@...gleboard.org> > Reviewed-by: Robert Nelson <robertcnelson@...il.com> > Signed-off-by: Drew Fustini <drew@...gleboard.org> > --- > arch/arm/boot/dts/am335x-bone-common.dtsi | 144 ++++++++++++++++++++++ Not sure if it should be in am335x-bone-common.dtsi. For example: am335x-boneblack.dts #include "am335x-bone-common.dtsi" #include "am335x-boneblack-common.dtsi" <-- hdmi defined only here am335x-bonegreen.dts #include "am335x-bone-common.dtsi" #include "am335x-bonegreen-common.dtsi" > 1 file changed, 144 insertions(+) > > diff --git a/arch/arm/boot/dts/am335x-bone-common.dtsi b/arch/arm/boot/dts/am335x-bone-common.dtsi > index 6c9187bc0f17..d86e67b0e852 100644 > --- a/arch/arm/boot/dts/am335x-bone-common.dtsi > +++ b/arch/arm/boot/dts/am335x-bone-common.dtsi > @@ -397,3 +397,147 @@ &rtc { > clocks = <&clk_32768_ck>, <&clk_24mhz_clkctrl AM3_CLK_24MHZ_CLKDIV32K_CLKCTRL 0>; > clock-names = "ext-clk", "int-clk"; > }; > + > +&gpio0 { > + gpio-line-names = > + "[ethernet]", > + "[ethernet]", > + "P9_22 [spi0_sclk]", > + "P9_21 [spi0_d0]", > + "P9_18 [spi0_d1]", > + "P9_17 [spi0_cs0]", > + "[sd card]", > + "P9_42A [ecappwm0]", > + "P8_35 [hdmi]", > + "P8_33 [hdmi]", > + "P8_31 [hdmi]", > + "P8_32 [hdmi]", [...] -- Best regards, grygorii
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