From: Bjorn Andersson <bjorn.andersson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Ram Chandra Jangir <rjangir-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: 'Christian Lamparter'
<chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>,
linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
'Linus Walleij'
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
'Rob Herring' <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
'Mark Rutland' <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
'John Crispin' <john-Pj+rj9U5foFAfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH 2/2] pinctrl: qcom: ipq4019: add remaining pin definitions
Date: Wed, 5 Jul 2017 23:02:43 -0700 [thread overview]
Message-ID: <20170706060243.GP18666@tuxbook> (raw)
In-Reply-To: <001b01d2d48e$3f366660$bda33320$@codeaurora.org>
On Wed 24 May 06:04 PDT 2017, Ram Chandra Jangir wrote:
>
>
> On Wednesday, May 24, 2017 12:59 AM CEST Bjorn Andersson wrote:
[..]
> >This makes me wonder what wifi1_uart (and uart1) actually is...
>
> >The wifi\d_uart seems to have 5 pins in its group and wifi\d_uart\d seems
> to be two sets of two pins. So perhaps this is some alternative routing and
> wifi0_uart0 and wifi0_uart1 is actually the same function?
>
> >@Ram, can you help us out here?
>
Ram, thanks for your answer. Unfortunately I missed this mail until
Christian posted the new version of the patch.
Unfortunately I don't understand the functions provided here, so I hope
you can help me better understand what's going on.
> wifi0_uart0 and wifi0_uart1 are different functions, and they are mapped as
> below:
> wifi0_uart --> wifi0 uart RTS
> wifi0_uart0 --> wifi0 uart RxD
> wifi0_uart1 --> wifi0 uart CTS
Christian has the following groups of pins for each function:
wifi0_uart: pin 8, 9, 11, 19 and 62
wifi0_uart0: pin 9 and 10
wifi0_uart1: pin 18 and 63
It's common to see alternative muxing of functions, so I'm guessing that
wifi0_uart1 is one of these. Is this correct?
But why is there 5 pins for RTS?
Why is receive (wifi0_uart0) two adjacent pins? Are they perhaps Rx and
Tx?
Why do we have a CTS line if we only have RxD, no TxD?
>
> wifi1_uart --> wifi1 uart TxD
> wifi1_uart0 --> wifi1 uart RxD
> wifi1_uart1 --> wifi1 uart CTS
>
Why is there no RTS for this when it seems bidirectional?
Regards,
Bjorn
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next prev parent reply other threads:[~2017-07-06 6:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-10 11:27 [PATCH 1/2] dt-bindings: pinctrl: add most other IPQ4019 pin functions and groups Christian Lamparter
[not found] ` <d53b7a9b1bab818536680123136ac58481d959c8.1494415174.git.chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2017-05-10 11:27 ` [PATCH 1/2] pinctrl: qcom: ipq4019: " Christian Lamparter
[not found] ` <20170510112712.14744-1-chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2017-05-13 0:10 ` Rob Herring
2017-05-13 16:03 ` Christian Lamparter
2017-05-16 0:13 ` Rob Herring
2017-05-10 11:27 ` [PATCH 2/2] pinctrl: qcom: ipq4019: add remaining pin definitions Christian Lamparter
[not found] ` <3dac044cd9a879cad145f9a04dcc3d225721aa3c.1494415174.git.chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2017-05-10 22:23 ` Bjorn Andersson
2017-05-17 20:07 ` Bjorn Andersson
2017-05-18 18:38 ` Christian Lamparter
2017-05-20 5:08 ` Bjorn Andersson
2017-05-23 16:58 ` Christian Lamparter
2017-05-23 19:28 ` Bjorn Andersson
2017-05-24 13:04 ` Ram Chandra Jangir
2017-07-06 6:02 ` Bjorn Andersson [this message]
2017-07-14 13:18 ` Christian Lamparter
2017-05-13 0:07 ` [PATCH 1/2] dt-bindings: pinctrl: add most other IPQ4019 pin functions and groups Rob Herring
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