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Tue, 19 Dec 2023 08:43:14 +0100 Received: from [80.62.117.166] (helo=localhost) by sslproxy03.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rFUl0-000PHd-2Q; Tue, 19 Dec 2023 08:43:14 +0100 From: esben@geanix.com To: Gregor Herburger Cc: Oleksij Rempel , Pengutronix Kernel Team , Andi Shyti , Shawn Guo , Sascha Hauer , Fabio Estevam , NXP Linux Team , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux@ew.tq-group.com Subject: Re: [PATCH] i2c: i2c-imx: allow bus recovery on non-muxable pads In-Reply-To: <20231218-i2c-imx-recovery-v1-1-f69fa85b228c@ew.tq-group.com> (Gregor Herburger's message of "Mon, 18 Dec 2023 18:06:12 +0100") References: <20231218-i2c-imx-recovery-v1-1-f69fa85b228c@ew.tq-group.com> Date: Tue, 19 Dec 2023 08:43:13 +0100 Message-ID: <87frzyprhq.fsf@geanix.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Authenticated-Sender: esben@geanix.com X-Virus-Scanned: Clear (ClamAV 0.103.10/27127/Mon Dec 18 10:39:04 2023) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231219_075439_025946_E3D49A95 X-CRM114-Status: GOOD ( 17.98 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Gregor Herburger writes: > Currently the i2c-imx driver assumes that for bus recovery the i2c pins > can be reconfigured as gpio via pinctrl. > > But bus recovery can also be done with a gpio electrically connected to > i2c scl. > > Modify i2c_imx_init_recovery_info to allow bus recovery on platforms > without pinctrl. In this case only use scl-gpio and > i2c_generic_scl_recovery. Why not move to use the generic GPIO recovery instead? Will something like this be able to cover at least the same scenarios as your change? >From 7e432496bae8c7ac35c21504bc1cd03f1dfef97f Mon Sep 17 00:00:00 2001 Message-ID: <7e432496bae8c7ac35c21504bc1cd03f1dfef97f.1702971634.git.esben@geanix.com> From: Esben Haabendal Date: Tue, 25 May 2021 11:25:44 +0200 Subject: [PATCH] i2c: imx: move to generic GPIO recovery Starting with commit 75820314de26 ("i2c: core: add generic I2C GPIO recovery") GPIO bus recovery is supported by the I2C core, so we can remove the driver implementation and use that one instead. As a nice side-effect, pinctrl becomes optional, allowing bus recovery on LS1021A, which does not have such luxury, but can be wired up to use extra fixed GPIO pins. Signed-off-by: Esben Haabendal --- drivers/i2c/busses/i2c-imx.c | 62 ++++-------------------------------- 1 file changed, 7 insertions(+), 55 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 1775a79aeba2..824d8bbb9be5 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -212,10 +212,6 @@ struct imx_i2c_struct { const struct imx_i2c_hwdata *hwdata; struct i2c_bus_recovery_info rinfo; - struct pinctrl *pinctrl; - struct pinctrl_state *pinctrl_pins_default; - struct pinctrl_state *pinctrl_pins_gpio; - struct imx_i2c_dma *dma; struct i2c_client *slave; enum i2c_slave_event last_slave_event; @@ -1357,24 +1353,6 @@ static int i2c_imx_xfer_atomic(struct i2c_adapter *adapter, return result; } -static void i2c_imx_prepare_recovery(struct i2c_adapter *adap) -{ - struct imx_i2c_struct *i2c_imx; - - i2c_imx = container_of(adap, struct imx_i2c_struct, adapter); - - pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_gpio); -} - -static void i2c_imx_unprepare_recovery(struct i2c_adapter *adap) -{ - struct imx_i2c_struct *i2c_imx; - - i2c_imx = container_of(adap, struct imx_i2c_struct, adapter); - - pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_default); -} - /* * We switch SCL and SDA to their GPIO function and do some bitbanging * for bus recovery. These alternative pinmux settings can be @@ -1385,43 +1363,17 @@ static void i2c_imx_unprepare_recovery(struct i2c_adapter *adap) static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx, struct platform_device *pdev) { - struct i2c_bus_recovery_info *rinfo = &i2c_imx->rinfo; + struct i2c_bus_recovery_info *bri = &i2c_imx->rinfo; - i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev); - if (!i2c_imx->pinctrl) { - dev_info(&pdev->dev, "pinctrl unavailable, bus recovery not supported\n"); + bri->pinctrl = devm_pinctrl_get(&pdev->dev); + if (PTR_ERR(bri->pinctrl) == -ENODEV) { + bri->pinctrl = NULL; return 0; } - if (IS_ERR(i2c_imx->pinctrl)) { - dev_info(&pdev->dev, "can't get pinctrl, bus recovery not supported\n"); - return PTR_ERR(i2c_imx->pinctrl); - } - - i2c_imx->pinctrl_pins_default = pinctrl_lookup_state(i2c_imx->pinctrl, - PINCTRL_STATE_DEFAULT); - i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl, - "gpio"); - rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN); - rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN); - - if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER || - PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER) { - return -EPROBE_DEFER; - } else if (IS_ERR(rinfo->sda_gpiod) || - IS_ERR(rinfo->scl_gpiod) || - IS_ERR(i2c_imx->pinctrl_pins_default) || - IS_ERR(i2c_imx->pinctrl_pins_gpio)) { - dev_dbg(&pdev->dev, "recovery information incomplete\n"); - return 0; - } - - dev_dbg(&pdev->dev, "using scl%s for recovery\n", - rinfo->sda_gpiod ? ",sda" : ""); + if (IS_ERR(bri->pinctrl)) + return PTR_ERR(bri->pinctrl); - rinfo->prepare_recovery = i2c_imx_prepare_recovery; - rinfo->unprepare_recovery = i2c_imx_unprepare_recovery; - rinfo->recover_bus = i2c_generic_scl_recovery; - i2c_imx->adapter.bus_recovery_info = rinfo; + i2c_imx->adapter.bus_recovery_info = bri; return 0; } -- 2.43.0 /Esben _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel