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Mon, 25 Feb 2019 08:29:18 -0800 (PST) From: Sergei Shtylyov Subject: Re: [RFC PATCH 5/5] mtd: hyperbus: Add driver for TI's Hyperbus memory controller To: "Vignesh R (by way of Boris Brezillon )" , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Rob Herring References: <20190219063607.29949-1-vigneshr@ti.com> <20190219063607.29949-6-vigneshr@ti.com> Organization: Cogent Embedded Message-ID: <907041d1-8412-22ca-3716-109a56251850@cogentembedded.com> Date: Mon, 25 Feb 2019 19:29:17 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20190219063607.29949-6-vigneshr@ti.com> Content-Language: en-MW X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190225_082923_210430_D3DB6E66 X-CRM114-Status: GOOD ( 23.99 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Arnd Bergmann , tudor.ambarus@microchip.com, Greg Kroah-Hartman , nsekhar@ti.com, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Hello! On 02/19/2019 09:36 AM, Vignesh R (by way of Boris Brezillon ) wrote: > Add driver for Hyperbus memory controller on TI's AM654 SoC. Programming > IP is pretty simple and provides direct memory mapped access to > connected Flash devices. Are you sure you posted the _complete_ driver? > Add basic support for the IP without DMA. Second ChipSelect is not > supported for now. > > Signed-off-by: Vignesh R > --- > drivers/mtd/hyperbus/hbmc_am654.c | 105 ++++++++++++++++++++++++++++++ > 1 file changed, 105 insertions(+) > create mode 100644 drivers/mtd/hyperbus/hbmc_am654.c > > diff --git a/drivers/mtd/hyperbus/hbmc_am654.c b/drivers/mtd/hyperbus/hbmc_am654.c > new file mode 100644 > index 000000000000..1f0d2dc52f9f > --- /dev/null > +++ b/drivers/mtd/hyperbus/hbmc_am654.c > @@ -0,0 +1,105 @@ [...] > +static int am654_hbmc_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct am654_hbmc_priv *priv; > + struct resource *res; > + int err; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, priv); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (IS_ERR(res)) { > + dev_err(&pdev->dev, "failed to get memory resource\n"); > + return -ENOENT; > + } > + > + priv->regbase = devm_ioremap_resource(dev, res); > + if (IS_ERR(priv->regbase)) { > + dev_err(dev, "Cannot remap controller address.\n"); > + return PTR_ERR(priv->regbase); > + } > + > + pm_runtime_enable(&pdev->dev); > + err = pm_runtime_get_sync(&pdev->dev); That's all nice but where's the code that accesses the actual registers? > + if (err < 0) { > + pm_runtime_put_noidle(&pdev->dev); Calling "put" with previously failed "get" sees strange... > + return err; > + } > + > + priv->hbdev.needs_calib = true; > + priv->hbdev.dev = &pdev->dev; > + priv->hbdev.np = of_get_next_child(dev->of_node, NULL); > + err = hb_register_device(&priv->hbdev); > + if (err) { > + dev_err(&pdev->dev, "failed to register controller\n"); > + goto err_destroy; > + } > + > + return 0; > + > +err_destroy: > + hb_unregister_device(&priv->hbdev); Calling "unregister" with "register" previously failed also looks strange... > + pm_runtime_put_sync(&pdev->dev); Why the sync() version? > + return err; > +} [...] MBR, Sergei ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/