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From: Wolfram Sang <wsa@kernel.org>
To: Codrin.Ciubotariu@microchip.com,
	Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, robh+dt@kernel.org,
	Ludovic.Desroches@microchip.com, Nicolas.Ferre@microchip.com,
	alexandre.belloni@bootlin.com, linux@armlinux.org.uk,
	kamel.bouhara@bootlin.com
Subject: Re: Re: Re: [RFC PATCH 4/4] i2c: at91: Move to generic GPIO bus recovery
Date: Fri, 4 Sep 2020 11:20:32 +0200
Message-ID: <20200904092032.GA32080@ninjato> (raw)
In-Reply-To: <15466c95-f1ea-63a4-1429-24d9b7567c1c@microchip.com>


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Hi Codrin,

> The pinmux driver needs to have strict set to false, otherwise the 
> switching is not available, not at this time at least. Perhaps there is 
> room for improvement here, because the I2C bus is not using the pins 
> while we are doing GPIO recovery.

Our driver doesn't use 'strict'. The thing is that I can't describe a
pinctrl state for GPIO. GPIO is the default state until another function
is requested. Back to GPIO currently means freeing the pin again, so it
defaults back to GPIO. We are currently discussing it. Geert (CCed)
isn't very happy of describing the same pins with 'function = "gpio"'
because the Kernel already knows the mapping, just needs to revert it.
Geert, please correct me if I am wrong.

> I am not sure I'll have time the next week to work on what you asked me 
> regarding sh_mobile and PXA, but I will look into it the week after that.
> Sorry about my delayed reply, I was on vacation.

Well, no need for sh_mobile, this is my todo item :) About PXA, well, I
am still happy that you volunteered to do it, so I hope you had a
relaxing vacation!

Happy hacking,

   Wolfram


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  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19 14:19 [RFC PATCH 0/4] i2c: core: add " Codrin Ciubotariu
2020-06-19 14:19 ` [RFC PATCH 1/4] dt-binding: i2c: add generic properties for " Codrin Ciubotariu
2020-07-05 21:19   ` Wolfram Sang
2020-07-24 19:39     ` Wolfram Sang
2020-07-24 20:52       ` Russell King - ARM Linux admin
2020-07-27 10:44         ` Codrin.Ciubotariu
2020-07-27 10:50           ` Russell King - ARM Linux admin
2020-07-30  9:00             ` Codrin.Ciubotariu
2020-08-03 14:16               ` Russell King - ARM Linux admin
2020-08-03 16:42                 ` Codrin.Ciubotariu
2020-07-15 19:21   ` Rob Herring
2020-06-19 14:19 ` [RFC PATCH 2/4] i2c: core: add generic I2C GPIO recovery Codrin Ciubotariu
2020-08-02 16:54   ` Wolfram Sang
2020-08-03 13:27     ` Codrin.Ciubotariu
2020-08-03 16:49       ` wsa
2020-06-19 14:19 ` [RFC PATCH 3/4] i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs Codrin Ciubotariu
2020-08-02 17:05   ` Wolfram Sang
2020-08-03 15:33     ` Codrin.Ciubotariu
2020-08-03 16:59       ` wsa
2020-06-19 14:19 ` [RFC PATCH 4/4] i2c: at91: Move to generic GPIO bus recovery Codrin Ciubotariu
2020-08-02 17:08   ` Wolfram Sang
2020-08-03 15:42     ` Codrin.Ciubotariu
2020-08-03 16:59       ` wsa
2020-08-26  6:14       ` Wolfram Sang
2020-09-04  8:55         ` Codrin.Ciubotariu
2020-09-04  9:20           ` Wolfram Sang [this message]
2020-07-05 21:09 ` [RFC PATCH 0/4] i2c: core: add " Wolfram Sang

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