linux-kernel - Re: [PATCH V2] ARM: dts: am33xx-l4: add gpio-ranges

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Message-ID: <20200629171257.GU37466@atomide.com>
Date:   Mon, 29 Jun 2020 10:12:57 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        "Mark A. Yoder" <mark.a.yoder@...il.com>
Subject: Re: [PATCH V2] ARM: dts: am33xx-l4: add gpio-ranges

* Drew Fustini <drew@...gleboard.org> [200610 04:03]:
> Add gpio-ranges properties to the gpio controller nodes.
> 
> These gpio-ranges were created based on "Table 9-10. CONTROL_MODULE
> REGISTERS" in the  "AM335x Technical Reference Manual" [0] and "Table
> 4-2. Pin Attributes" in the "AM335x Sitara Processor datasheet" [1].
> A csv file with this data is available for reference [2].
> 
> These mappings are valid for all SoC's that are using am33xx-l4.dtsi.
> In addition, the only TI AM33xx parts that actually exist are [0]:
> AM3351, AM3352, AM3354, AM3356, AM3357, AM3358, AM3359
> 
> These gpio-ranges properties should be added as they describe the
> relationship between a gpio line and pin control register that exists
> in the hardware.  For example, GPMC_A0 pin has mode 7 which is labeled
> gpio1_16. conf_gpmc_a0 register is at offset 840h which makes it pin 16.
> 
> [0] https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf
> [1] http://www.ti.com/lit/ds/symlink/am3358.pdf
> [2] https://gist.github.com/pdp7/6ffaddc8867973c1c3e8612cfaf72020
> [3] http://www.ti.com/processors/sitara-arm/am335x-cortex-a8/overview.html
> 
> Signed-off-by: Drew Fustini <drew@...gleboard.org>
> ---
> V2 changes:
> - clarify that these gpio-ranges are valid for all SoCs including that
>   am33xx-l4.dtsi
> - describe why these gpio-ranges should be added

Thanks applying into omap-for-v5.9/dt.

Regards,

Tony