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Thu, 02 Apr 2020 02:48:11 -0700 (PDT) Received: from kozik-lap ([194.230.155.125]) by smtp.googlemail.com with ESMTPSA id qk2sm1008399ejb.80.2020.04.02.02.48.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 02 Apr 2020 02:48:11 -0700 (PDT) Date: Thu, 2 Apr 2020 11:48:08 +0200 From: 'Krzysztof Kozlowski' To: Hyunki Koo Subject: Re: [PATCH] tty: samsung_tty: 32-bit access for TX/RX hold registers Message-ID: <20200402094808.GA21903@kozik-lap> References: <20200401082721.19431-1-hyunki00.koo@samsung.com> <20200401085548.GC2026666@kroah.com> <20200401091952.GA14425@kozik-lap> <000001d608d3$5faa8260$1eff8720$@samsung.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <000001d608d3$5faa8260$1eff8720$@samsung.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-20200402_024814_461440_8136E5F2 X-CRM114-Status: GOOD ( 17.63 ) 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, 'Greg Kroah-Hartman' , linux-kernel@vger.kernel.org, 'Kukjin Kim' , 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 Thu, Apr 02, 2020 at 06:44:58PM +0900, Hyunki Koo wrote: > On Wed, Apr 01, 2020 at 6:20:20PM +0900, Krzysztof Kozlowski > wrote: > > 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 > > [Hyunki Koo] > reg-io-width =4 is required for Samsung uart > To do not break older dts files, I will set default value in else of of_property_read_u32 like below. > + if (of_property_read_u32(np, "reg-io-width", &prop) == 0) { > + ... > + } else { > + ourport->port.iotype = UPIO_MEM; > + } Thanks. Also, please test your patch on available Exynos boards, e.g. Odroid XU4 or HC1. Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel