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Tue, 17 Sep 2019 04:38:58 +0000 From: Yoshihiro Shimoda To: Gareth Williams CC: "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , Geert Uytterhoeven , Phil Edworthy , Fabrizio Castro , "laurent.pinchart@ideasonboard.com" , "kieran.bingham+renesas@ideasonboard.com" Subject: RE: DRM Driver implementation question Thread-Topic: DRM Driver implementation question Thread-Index: AdVslX1ZBzegHzojRVS64lgG04s8jgAenS2A Date: Tue, 17 Sep 2019 04:38:58 +0000 Message-ID: References: In-Reply-To: Accept-Language: ja-JP, en-US Content-Language: ja-JP X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=yoshihiro.shimoda.uh@renesas.com; x-originating-ip: [150.249.235.54] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a6f16fad-c1ba-44eb-27b7-08d73b28f4bf x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600167)(711020)(4605104)(1401327)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:TYAPR01MB4415; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-Network-Message-Id: a6f16fad-c1ba-44eb-27b7-08d73b28f4bf X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Sep 2019 04:38:58.5764 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 7ve2+nwRpxYi/sbVDsUY8qEwbKqb8B+L20G/ZBc9wjRgePQXVb3eZB3nXXCy97fHZyYsM5q2dgKqzNQ403EWm7GyFyXJPPqk02oV2KpNxGta0QXwKFsFHDPPv6g+JQ5v X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYAPR01MB4415 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Gareth, > From: Gareth Williams, Sent: Monday, September 16, 2019 10:56 PM >=20 > Hi Laurent/Kieran, >=20 > I need to upstream a driver for a display controller that within its regi= sters memory region contains registers related > to a PWM device. The PWM device is for controlling the backlight of the d= isplay. > Ideally, I would like to create a separated driver for the PWM, so that I= can re-use "pwm-backlight", but since the registers > for the PWM are right in the middle of the registers for the display cont= roller I would need to ioremap the memory region > for the PWM registers region twice, once from the display controller driv= er, and once from the PWM driver. > Do you think that the double ioremap would be acceptable upstream? I think that an MFD driver can support such hardware. I checked Documentati= on/devicetree/bindings/mfd roughly, and then atmel-hlcdc.txt seems to have a display controller and a PWM devic= e. Best regards, Yoshihiro Shimoda