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Tue, 31 Mar 2020 19:29:28 +0000 (GMT) Subject: Re: [PATCH 2/2] ARM: DTS: Add devicetree file for the Galaxy S2 To: =?UTF-8?Q?Pawe=c5=82_Chmiel?= , Paul Cercueil Cc: Krzysztof Kozlowski , Kukjin Kim , Rob Herring , mark.rutland@arm.com, Stenkin Evgeniy , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org From: Marek Szyprowski Message-ID: Date: Tue, 31 Mar 2020 21:29:24 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Transfer-Encoding: 8bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrIKsWRmVeSWpSXmKPExsWy7djPc7qSs5rjDJ7+5bCYf+Qcq0X/49fM FufPb2C32PT4GqvF5V1z2CxmnN/HZLH0+kUmi/7Fl1gsfhzvY7Zo3XuE3WLKkpnsDtwea+at YfRYfamdzWPnrLvsHptWdbJ5bF5S7/F5k1wAWxSXTUpqTmZZapG+XQJXxoJrd9gK2sUqzs9a zNbAuFiwi5GTQ0LARGLDsS7GLkYuDiGBFYwSU1Z+YoVwvjBKvLo/lwXC+cwo0Tj9CVAZB1jL wxd6EPHljBJH7qxig3DeM0o8XvSIBaRIWMBDYv/zZJAVIgJZEs3/usGmMgtsZ5Jo/riPHSTB JmAo0fW2iw3E5hWwk1i/9wYLiM0ioCqxftUcJhBbVCBG4uLhflaIGkGJkzOfgNVwCrhLfOzb B1bDLCAv0bx1NjOELS5x68l8JojfbrFLHH3gDWG7SHybeZENwhaWeHV8CzuELSPxfydIPReQ 3cwo8fDcWnYIp4dR4nLTDEaIKmuJO+d+sYF8xiygKbF+lz4kJBwl3t6UgDD5JG68FYQ4gU9i 0rbpzBBhXomONiGIGWoSs46vg9t68MIl5gmMSrOQPDYLyTOzkDwzC2HtAkaWVYziqaXFuemp xYZ5qeV6xYm5xaV56XrJ+bmbGIEJ6/S/4592MH69lHSIUYCDUYmHt8KmOU6INbGsuDL3EKME B7OSCC+bf0OcEG9KYmVValF+fFFpTmrxIUZpDhYlcV7jRS9jhQTSE0tSs1NTC1KLYLJMHJxS DYzs+s1LHx7xc1ddEKG2vyi4NPNUXNOmhM1P+uZPNQjb83LnUpsNk/e5flpuzOocOV8qJCA2 sV/SJmS+iF7u8vJ/kxiTol7cFFy09Omt1vD7G2+zPN3fs/P+rVKnXsm/dRWfXWt3GyoEhDMG rWmq/DpbWXON9ZLClUu9+14JPnXK/utwM/nh/BAlluKMREMt5qLiRABB9k9WVAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCIsWRmVeSWpSXmKPExsVy+t/xu7oSs5rjDDb+1beYf+Qcq0X/49fM FufPb2C32PT4GqvF5V1z2CxmnN/HZLH0+kUmi/7Fl1gsfhzvY7Zo3XuE3WLKkpnsDtwea+at YfRYfamdzWPnrLvsHptWdbJ5bF5S7/F5k1wAW5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJ pZ6hsXmslZGpkr6dTUpqTmZZapG+XYJexoJrd9gK2sUqzs9azNbAuFiwi5GDQ0LAROLhC70u Ri4OIYGljBLrDlxh7WLkBIrLSJyc1gBlC0v8udbFBlH0llGis3ETG0izsICHxP7nySA1IgJZ Ejuef2cCqWEW2M4ksXbTOmaQhJDALWaJvq2MIDabgKFE11uQQZwcvAJ2Euv33mABsVkEVCXW r5rDBGKLCsRI/NzTxQJRIyhxcuYTMJtTwF3iY98+sBpmATOJeZsfMkPY8hLNW2dD2eISt57M Z5rAKDQLSfssJC2zkLTMQtKygJFlFaNIamlxbnpusaFecWJucWleul5yfu4mRmCMbjv2c/MO xksbgw8xCnAwKvHwVtg0xwmxJpYVV+YeYpTgYFYS4WXzb4gT4k1JrKxKLcqPLyrNSS0+xGgK 9NxEZinR5Hxg+sgriTc0NTS3sDQ0NzY3NrNQEuftEDgYIySQnliSmp2aWpBaBNPHxMEp1cCo 41Z7aBKLf5Ifh6jK9ZURW84xvo6pfnG7p6rY5qCi0MJftduEqt+frJ5ZMu3B8e/HtsdU/z2w ptRz113N/9e0vpxTcDz499Err80hPfvO+QQuKN9lp7hku1TwnE/WnQ49Nq1dRztXbPDZeuWd jufnwz1+/JqzZqhGbnirwPDlytp9fpYmc849V2Ipzkg01GIuKk4EAESzMbnnAgAA X-CMS-MailID: 20200331192928eucas1p20327aab9f22430820b066fe05e310b51 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200318142549eucas1p1793027850923ebad20b4691cba676671 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200318142549eucas1p1793027850923ebad20b4691cba676671 References: <20200312153411.13535-1-paul@crapouillou.net> <20200312153411.13535-2-paul@crapouillou.net> <20200313090011.GB7416@pi3> <6c549058-00f9-8526-a272-48c538166ccf@samsung.com> <6ca59c1b-2676-e69d-e4eb-4667a81d155f@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi On 2020-03-31 17:29, Paweł Chmiel wrote: > On Tue, 2020-03-31 at 15:55 +0200, Marek Szyprowski wrote: >> Hi Paul, >> >> On 2020-03-31 15:09, Paul Cercueil wrote: >>> Cc: Paweł Chmiel >>> >>> Hi Marek, >>> >>> Le mar. 31 mars 2020 à 7:36, Marek Szyprowski >>> a écrit : >>>> Hi Paul, >>>> >>>> On 2020-03-18 15:25, Paul Cercueil wrote: >>>>>>> + }; >>>>>>> + >>>>>>> + tsp_reg: regulator-1 { >>>>>>> + compatible = "regulator-fixed"; >>>>>>> + regulator-name = "TSP_FIXED_VOLTAGES"; >>>>>>> + regulator-min-microvolt = <3300000>; >>>>>>> + regulator-max-microvolt = <3300000>; >>>>>>> + gpio = <&gpl0 3 GPIO_ACTIVE_HIGH>; >>>>>>> + startup-delay-us = <70000>; >>>>>>> + enable-active-high; >>>>>>> + regulator-boot-on; >>>>>>> + regulator-always-on; >>>>>> always-on and boot-on should not be needed. You have a consumer >>>>>> for this >>>>>> regulator. >>>>> About this: the touchscreen driver does not use a regulator, so I >>>>> believe that's why these properties were here. >>>>> >>>>> I sent patches upstream to address the issue: >>>>> https://protect2.fireeye.com/url?k=e8aedc29-b53072b3-e8af5766-0cc47a336fae-759579fd576d8382&u=https://lkml.org/lkml/2020/3/15/94 >>>>> >>>>> >>>>> I believe this means I cannot merge the i9100 devicetree until it is >>>>> acked. >>>> One more information - similar change has been already posted, but it >>>> looks it got lost then: https://patchwork.kernel.org/patch/10550903/ >>> I was aware of this patch, but didn't know it was sent upstream. >>> >>> This other patch uses two regulators, vdd/avdd but doesn't give any >>> reason why. >>> >> I've checked the UniversalC210 schematic, which uses the same >> touchscreen chip. There are 2 supplies to the touchscreen chip: 2.8V VDD >> and 3.3V AVDD. Both are enabled by the same GPIO pin though. There is >> however no reset GPIO pin there. > Hi > Don't remember now how it worked on Galaxy S1, but it looks like it has > the same setup - two regulators enabled by one GPIO pin. It is quite common for the regulators to share the enable GPIO line, so this is not an issue. Regulator framework supports such configuration for ages. I'm curious about the reset GPIO line, which were made mandatory for the regulators control in your patch. I didn't find it on any schematic of the devices with this touch screen, but I don't have a schematic of the Galaxy S1. IMHO the reset signal is simply derived from the supply regulators with some simple circuit, but I don't have schematic of that part. 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