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Message-ID: <52CC6782.4060309@broadcom.com> Date: Tue, 7 Jan 2014 12:45:54 -0800 From: Sherman Yin <syin@...adcom.com> To: Linus Walleij <linus.walleij@...aro.org> CC: Mark Brown <broonie@...nel.org>, Rob Herring <rob.herring@...xeda.com>, Heiko Stübner <heiko@...ech.de>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Stephen Warren <swarren@...dotorg.org>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Rob Landley <rob@...dley.net>, Christian Daudt <bcm@...thebug.org>, Russell King <linux@....linux.org.uk>, Grant Likely <grant.likely@...aro.org>, Matt Porter <matt.porter@...aro.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH v4 2/4] pinctrl: Add pinctrl binding for Broadcom Capri SoCs On 14-01-07 09:15 AM, Linus Walleij wrote: > On Sat, Dec 21, 2013 at 3:13 AM, Sherman Yin <syin@...adcom.com> wrote: >> +Optional Properties (for standard pins): >> + >> +- function: String. Specifies the pin mux selection. Values >> + must be one of: "alt1", "alt2", "alt3", "alt4" >> +- input-schmitt-enable: No arguments. Enable schmitt-trigger mode. >> +- input-schmitt-disable: No arguments. Disable schmitt-trigger mode. >> +- bias-pull-up: No arguments. Pull up on pin. >> +- bias-pull-down: No arguments. Pull down on pin. >> +- bias-disable: No arguments. Disable pin bias. >> +- slew-rate: Integer. Meaning depends on configured pin mux: >> + *_SCL or *_SDA: >> + 0: Standard(100kbps)& Fast(400kbps) mode >> + 1: Highspeed (3.4Mbps) mode >> + IC_DM or IC_DP: >> + 0: normal slew rate >> + 1: fast slew rate >> + Otherwise: >> + 0: fast slew rate >> + 1: normal slew rate >> +- input-enable: No arguements. Enable input (does not affect >> + output.) >> +- input-disable: No arguements. Disable input (does not affect >> + output.) >> +- drive-strength: Integer. Drive strength in mA. Valid values are >> + 2, 4, 6, 8, 10, 12, 14, 16 mA. > > Also patch > Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt > Since you're adding generic properties. Please note that I removed from this patchset the patch that you've merged to your for-next branch already: https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-pinctrl.git/commit/?h=for-next&id=8ba3f4d00078e7a49c60c0bd6298f29402c3a0a0 Is that what you wanted to see in pinctrl-bindings.txt, or is there something else you want to see added to that txt file? I didn't want to add the description of slew-rate arguments there because this is capri-specific. I'm not quite sure what else to add. >> +Optional Properties (for I2C pins): >> + >> +- function: String. Specifies the pin mux selection. Values >> + must be one of: "alt1", "alt2", "alt3", "alt4" >> +- bias-pull-up: Integer. Pull up strength in Ohm. There are 3 >> + pull-up resisitors (1.2k, 1.8k, 2.7k) available >> + in parallel for I2C pins, so the valid values >> + are: 568, 720, 831, 1080, 1200, 1800, 2700 Ohm. > > Also patch > Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt That doc already says bias-pull-up is specified in Ohm, and the specific values are chip-specific, so I don't think they should be mentioned there. >> +- bias-disable: No arguments. Disable pin bias. >> +- slew-rate: Integer. Meaning depends on configured pin mux: >> + *_SCL or *_SDA: >> + 0: Standard(100kbps)& Fast(400kbps) mode >> + 1: Highspeed (3.4Mbps) mode >> + IC_DM or IC_DP: >> + 0: normal slew rate >> + 1: fast slew rate >> + Otherwise: >> + 0: fast slew rate >> + 1: normal slew rate > > Hm that does not seem generic though, so let's not add this to the > generic bindings. > >> +- input-enable: No arguements. Enable input (does not affect >> + output.) >> +- input-disable: No arguements. Disable input (does not affect >> + output.) >> + >> +Optional Properties (for HDMI pins): >> + >> +- function: String. Specifies the pin mux selection. Values >> + must be one of: "alt1", "alt2", "alt3", "alt4" >> +- slew-rate: Integer. Controls slew rate. >> + 0: Standard(100kbps)& Fast(400kbps) mode >> + 1: Highspeed (3.4Mbps) mode > > Hmmmm slew rate is not specifiec in "bps" but rather in > something like volts per second. But maybe it's best to keep > this value driver-specific. Right, I think the slew-rates values are capri specific. Thanks for the review. Regards, Sherman -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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