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Date: Tue, 12 May 2015 14:45:16 +0200 From: Sascha Hauer <s.hauer@...gutronix.de> To: Eddie Huang <eddie.huang@...iatek.com> Cc: Wolfram Sang <wsa@...-dreams.de>, Sascha Hauer <kernel@...gutronix.de>, srv_heupstream@...iatek.com, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Matthias Brugger <matthias.bgg@...il.com>, Jean Delvare <jdelvare@...e.de>, David Box <david.e.box@...ux.intel.com>, Doug Anderson <dianders@...omium.org>, Zhangfei Gao <zhangfei.gao@...aro.org>, Max Schwarz <max.schwarz@...ine.de>, Boris BREZILLON <boris.brezillon@...e-electrons.com>, Anders Berg <anders.berg@...gotech.com>, Neelesh Gupta <neelegup@...ux.vnet.ibm.com>, Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>, Ray Jui <rjui@...adcom.com>, Simon Glass <sjg@...omium.org>, Wei Yan <sledge.yanwei@...wei.com>, Beniamino Galvani <b.galvani@...il.com>, Xudong Chen <xudong.chen@...iatek.com>, Liguo Zhang <liguo.zhang@...iatek.com>, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org Subject: Re: [PATCH v7 0/3] ARM: mediatek: Add driver for Mediatek I2C On Wed, May 06, 2015 at 04:37:04PM +0800, Eddie Huang wrote: > This series is for Mediatek SoCs I2C controller common bus driver. > > Earlier MTK SoC ((for example, MT6589, MT8135)) I2C HW has some limitationes. > New generation SoC like MT8173 fix following limitations: > > 1. Only support one i2c_msg number. One exception is WRRD (write then read) > mode. WRRD can have two i2c_msg numbers. > > 2. Mediatek I2C controller support WRRD(write then read) mode, in WRRD > mode the Repeat Start will be issued between 2 messages. > In this driver if 2 messages is first write then read, the driver will > combine 2 messages using Write-Read mode so the RS will be issued between > the 2 messages. > > 3. The max transfer data length is 255 in one message. In WRRD mode, the > max data length of second msg is 31. > > MT8135 and MT6589 can control I2C pins on PMIC(MT6397) by setting the i2c > registers in MT8135 side. In this case, driver should set OFFSET_PATH_DIR > bit first, the operation on other registers are still the same. > For now MT6589/MT8135 support this, MT6577/MT6595/MT8127 do not support. > For example, If want to use I2C4/5/6 pins on MT8135 just need to enable > the pinmux, else if want to use I2C pins on PMIC(MT6397) need to add > "mediatek,have-pmic" property in the .dts file of each platform. > > This driver is based on 4.1-rc1. > > Change in v7: > Fix mtk_i2c_of_match in wrong patch bug. > > Change in v6: > 1. Update binding document not use default clock-frequency as example. > 2. Add mtk_i2c_compatible struct and pass hardware capabilities > through of_device_id > 3. Remove some hardware setting in mtk_i2c_do_transfer to mtk_i2c_init_hw > so just init one time. > 4. Correct mtk_i2c_parse_dt don't set default clock bug. > > Change in v5: > Apply new i2c_adapter_quirks patch [2]. Change to use dam_map_single to map > dma buffer. Add spinlock to fix race condition. Check of_property_read_u32 > return value. Remove I2C_FUNC_10BIT_ADDR capability due to driver not implement. > Add MT8173 I2C driver. > > Change in v4: > Modify to support i2c_adapter_quirks base on Wolfram's patch [1]. > Remove check transfer size and WRRD combine code. Instead, fill quirk > property and let i2c_check_for_quirks to do the filter. > > [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/314804.html > [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/325744.html > > Eddie Huang (1): > I2C: mediatek: Add driver for MediaTek MT8173 I2C controller > > Xudong Chen (2): > dt-bindings: Add I2C bindings for mt65xx/mt81xx. > I2C: mediatek: Add driver for MediaTek I2C controller All: Acked-by: Sascha Hauer <s.hauer@...gutronix.de> Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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