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Wed, 01 Apr 2020 02:19:54 -0700 (PDT) Received: from kozik-lap ([194.230.155.125]) by smtp.googlemail.com with ESMTPSA id w4sm393813ejz.44.2020.04.01.02.19.53 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 01 Apr 2020 02:19:54 -0700 (PDT) Date: Wed, 1 Apr 2020 11:19:52 +0200 From: Krzysztof Kozlowski To: Greg Kroah-Hartman Subject: Re: [PATCH] tty: samsung_tty: 32-bit access for TX/RX hold registers Message-ID: <20200401091952.GA14425@kozik-lap> References: <20200401082721.19431-1-hyunki00.koo@samsung.com> <20200401085548.GC2026666@kroah.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200401085548.GC2026666@kroah.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200401_021957_067002_2584463B X-CRM114-Status: GOOD ( 14.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, hyunki00.koo@gmail.com, linux-kernel@vger.kernel.org, Kukjin Kim , Hyunki Koo , linux-serial@vger.kernel.org, Jiri Slaby , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 01, 2020 at 10:55:48AM +0200, Greg Kroah-Hartman wrote: > On Wed, Apr 01, 2020 at 05:27:20PM +0900, Hyunki Koo wrote: > > - if (np) > > + if (np) { > > of_property_read_u32(np, > > "samsung,uart-fifosize", &ourport->port.fifosize); > > > > + if (of_property_read_u32(np, "reg-io-width", &prop) == 0) { > > + switch (prop) { > > + case 1: > > + ourport->port.iotype = UPIO_MEM; > > + break; > > + case 4: > > + ourport->port.iotype = UPIO_MEM32; > > + break; > > + default: > > + dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n", > > + prop); > > + ret = -EINVAL; > > + break; > > + } > > + } > > + } > > + > > Does this mean that reg-io-width is now a required property for all > samsung uarts? Does this break older dts files? Or should you > fall-back to the previous operation if the attribute is not there? Yes, it looks like silently breaking all boards. Since of_property_read_u32() will return errno, the warning message won't be printed and all register reads will fail (return 0). This looks like not tested on real HW. Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel