From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> To: Richard Genoud <richard.genoud-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Subject: Re: [PATCH 05/14] ARM: at91: add pinctrl support Date: Thu, 23 Aug 2012 11:49:31 -0600 [thread overview] Message-ID: <50366D2B.4010807@wwwdotorg.org> (raw) In-Reply-To: <CACQ1gAieByr5vMmyyCuGtS8AgnnRZPPhLZY8sKvwvcQYe5ieUA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> On 08/23/2012 01:06 AM, Richard Genoud wrote: > 2012/8/22 Stephen Warren <swarren@wwwdotorg.org>: >>>> +Required properties for iomux controller: >>>> +- compatible: "atmel,at91rm9200-pinctrl" >>>> +- atmel,mux-mask: array of mask (periph per bank) to describe if a pin can be >>>> + configured in this periph mode. All the periph and bank need to be describe. >>> >>> Can you please be more elaborate on this mux-mask, like what each bit >>> means and why the bits are arranged like that and what it means on the >>> AT91 platform.... I was first reading the .dts and was like ?woot? so >>> I go to the bindings doc and I read this and I'm still like ?woot?.. >> >> Yes, I'm a little confused what this is, and wouldn't have a clue how to >> fill it in. > > With a practical example it's easier to understand. > Take a SAM9X5 release manual (here is sam9g35): > http://www.atmel.com/Images/doc11053.pdf page 11 (§4.3 package pinout) > in the file arch/arm/boot/dts/at91sam9x5.dtsi you've got the the > atmel,mux-mask like that: > > /* periphA periphB periphC */ > 0xffffffff 0xffe0399f 0xc000001c /* pioA */ > 0x0007ffff 0x8000fe3f 0x00000000 /* pioB */ > 0x80000000 0x07c0ffff 0xb83fffff /* pioC */ > 0x003fffff 0x003f8000 0x00000000 /* pioD */ > > Let's take the PioA - peripheral B: 0xffe0399f > From the documentation table 4-3, we can extract the column PIO > Periperal B for all signals PA0-PA31: ... > Each time it's possible to mux a pin to the peripheral B function (ie > when there's no "-----") the corresponding bit is set: ... > => this gives 0x399f Ah OK. It would be a good idea to briefly describe this process in the binding document I think. I assume this property exists to avoid the kernel driver having to contain tables for each Atmel device; the driver is generic. _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss
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From: swarren@wwwdotorg.org (Stephen Warren) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/14] ARM: at91: add pinctrl support Date: Thu, 23 Aug 2012 11:49:31 -0600 [thread overview] Message-ID: <50366D2B.4010807@wwwdotorg.org> (raw) In-Reply-To: <CACQ1gAieByr5vMmyyCuGtS8AgnnRZPPhLZY8sKvwvcQYe5ieUA@mail.gmail.com> On 08/23/2012 01:06 AM, Richard Genoud wrote: > 2012/8/22 Stephen Warren <swarren@wwwdotorg.org>: >>>> +Required properties for iomux controller: >>>> +- compatible: "atmel,at91rm9200-pinctrl" >>>> +- atmel,mux-mask: array of mask (periph per bank) to describe if a pin can be >>>> + configured in this periph mode. All the periph and bank need to be describe. >>> >>> Can you please be more elaborate on this mux-mask, like what each bit >>> means and why the bits are arranged like that and what it means on the >>> AT91 platform.... I was first reading the .dts and was like ?woot? so >>> I go to the bindings doc and I read this and I'm still like ?woot?.. >> >> Yes, I'm a little confused what this is, and wouldn't have a clue how to >> fill it in. > > With a practical example it's easier to understand. > Take a SAM9X5 release manual (here is sam9g35): > http://www.atmel.com/Images/doc11053.pdf page 11 (?4.3 package pinout) > in the file arch/arm/boot/dts/at91sam9x5.dtsi you've got the the > atmel,mux-mask like that: > > /* periphA periphB periphC */ > 0xffffffff 0xffe0399f 0xc000001c /* pioA */ > 0x0007ffff 0x8000fe3f 0x00000000 /* pioB */ > 0x80000000 0x07c0ffff 0xb83fffff /* pioC */ > 0x003fffff 0x003f8000 0x00000000 /* pioD */ > > Let's take the PioA - peripheral B: 0xffe0399f > From the documentation table 4-3, we can extract the column PIO > Periperal B for all signals PA0-PA31: ... > Each time it's possible to mux a pin to the peripheral B function (ie > when there's no "-----") the corresponding bit is set: ... > => this gives 0x399f Ah OK. It would be a good idea to briefly describe this process in the binding document I think. I assume this property exists to avoid the kernel driver having to contain tables for each Atmel device; the driver is generic.
next prev parent reply other threads:[~2012-08-23 17:49 UTC|newest] Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-08-10 12:48 [PATCH 00/14] ARM: at91: add pinctrl support Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:01 ` [PATCH 01/14] ARM: at91: gpio: implement request and free Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:01 ` [PATCH 02/14] at91: regroup gpio and pinctrl under a simple-bus Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 8:52 ` Linus Walleij 2012-08-18 21:14 ` Arnd Bergmann 2012-08-10 13:02 ` [PATCH 03/14] arm: at91: at91sam9x5: fix gpio number per bank Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 8:54 ` Linus Walleij 2012-09-11 10:21 ` Nicolas Ferre 2012-08-18 21:18 ` Arnd Bergmann 2012-08-20 8:02 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:02 ` [PATCH 04/14] ARM: at91: add dummies pinctrl for non dt platform Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 8:55 ` Linus Walleij 2012-09-11 10:22 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 05/14] ARM: at91: add pinctrl support Jean-Christophe PLAGNIOL-VILLARD 2012-08-13 14:53 ` Richard Genoud 2012-08-14 2:37 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-14 7:24 ` Richard Genoud [not found] ` <1344603731-32667-5-git-send-email-plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org> 2012-08-15 14:38 ` Linus Walleij 2012-08-15 14:38 ` Linus Walleij 2012-08-16 12:18 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-16 12:18 ` Jean-Christophe PLAGNIOL-VILLARD [not found] ` <20120816121852.GA7439-RQcB7r2h9QmfDR2tN2SG5Ni2O/JbrIOy@public.gmane.org> 2012-08-16 15:15 ` Warner Losh 2012-08-16 15:15 ` Warner Losh [not found] ` <CACRpkdZ2__V06Eo8JH451Sup5Nw2jJXVOH2FOfZBp5nNYpCtbg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2012-08-22 15:34 ` Stephen Warren 2012-08-22 15:34 ` Stephen Warren [not found] ` <5034FC18.2090400-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2012-08-23 7:06 ` Richard Genoud 2012-08-23 7:06 ` Richard Genoud [not found] ` <CACQ1gAieByr5vMmyyCuGtS8AgnnRZPPhLZY8sKvwvcQYe5ieUA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2012-08-23 17:49 ` Stephen Warren [this message] 2012-08-23 17:49 ` Stephen Warren 2012-08-25 8:38 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-25 8:38 ` Jean-Christophe PLAGNIOL-VILLARD [not found] ` <20120825083811.GB7629-RQcB7r2h9QmfDR2tN2SG5Ni2O/JbrIOy@public.gmane.org> 2012-08-27 23:46 ` Linus Walleij 2012-08-27 23:46 ` Linus Walleij [not found] ` <CACRpkdYWXZLNdgMhqoMZsaaszZ5Uz9pZ1EO=mrnuY5Der4O+Mw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2012-08-28 6:51 ` Richard Genoud 2012-08-28 6:51 ` Richard Genoud 2012-09-11 10:27 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 06/14] arm: at91: dt: at91sam9 " Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 8:57 ` Linus Walleij 2012-08-17 15:39 ` Richard Genoud 2012-08-20 14:09 ` Richard Genoud 2012-08-20 15:11 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-20 15:43 ` Richard Genoud 2012-09-11 10:29 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 07/14] arm: at91: dt: at91sam9 add serial " Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:00 ` Linus Walleij 2012-09-11 10:30 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 08/14] tty: atmel_serial: add " Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:02 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 16:10 ` Greg KH 2012-08-10 16:10 ` Greg KH 2012-08-15 9:01 ` Linus Walleij 2012-08-15 9:01 ` Linus Walleij 2012-09-11 10:33 ` Nicolas Ferre 2012-09-11 10:33 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 09/14] arm: at91: dt: sam9m10g45ek: use rts/cts pinctrl group for uart1 Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:02 ` Linus Walleij 2012-09-11 10:34 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 10/14] arm: at91: dt: sam9263ek: use rts/cts pinctrl group for uart0 Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:02 ` Linus Walleij 2012-09-11 10:34 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 11/14] arm: at91: dt: sam9g20ek: use rts/cts/dtr/dsr/dcd/ri " Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:03 ` Linus Walleij 2012-09-11 10:36 ` Nicolas Ferre 2012-08-10 13:02 ` [PATCH 12/14] MTD: atmel nand: fix gpio missing request Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:05 ` Linus Walleij 2012-08-10 13:02 ` [PATCH 13/14] arm: at91: dt: at91sam9 add nand pinctrl support Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:06 ` Linus Walleij 2012-08-16 15:19 ` Richard Genoud 2012-08-16 17:38 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-17 6:53 ` Richard Genoud 2012-08-20 7:58 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:02 ` [PATCH 14/14] MTD: atmel_nand: add pinctrl consumer support Jean-Christophe PLAGNIOL-VILLARD 2012-08-10 13:02 ` Jean-Christophe PLAGNIOL-VILLARD 2012-08-15 9:07 ` Linus Walleij 2012-08-15 9:07 ` Linus Walleij 2012-08-24 11:51 ` Artem Bityutskiy 2012-08-24 11:51 ` Artem Bityutskiy 2012-08-15 8:51 ` [PATCH 01/14] ARM: at91: gpio: implement request and free Linus Walleij
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