From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 766D2C46464 for ; Fri, 10 Aug 2018 17:45:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20BC522429 for ; Fri, 10 Aug 2018 17:45:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 20BC522429 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728371AbeHJUQg (ORCPT ); Fri, 10 Aug 2018 16:16:36 -0400 Received: from mx2.suse.de ([195.135.220.15]:51232 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727493AbeHJUQg (ORCPT ); Fri, 10 Aug 2018 16:16:36 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id B99E8ADAB; Fri, 10 Aug 2018 17:45:43 +0000 (UTC) Subject: Re: [RFC] serial: sc16is7xx: Use DT sub-nodes for UART ports To: Rob Herring Cc: SERIAL DRIVERS , Linux-MIPS , jringle@gridpoint.com, Michael Allwright , Jakub Kicinski , liuxuenetmail@gmail.com, Greg Kroah-Hartman , Jiri Slaby , "linux-kernel@vger.kernel.org" References: <20180805232651.10605-1-afaerber@suse.de> From: =?UTF-8?Q?Andreas_F=c3=a4rber?= Openpgp: preference=signencrypt Autocrypt: addr=afaerber@suse.de; prefer-encrypt=mutual; keydata= xsFNBE6W6ZQBEAC/BIukDnkVenIkK9O14UucicBIVvRB5WSMHC23msS+R2h915mW7/vXfn+V 0nrr5ECmEg/5OjujKf0x/uhJYrsxcp45nDyYCk+RYoOJmGzzUFya1GvT/c04coZ8VmgFUWGE vCfhHJro85dZUL99IoLP21VXEVlCPyIngSstikeuf14SY17LPTN1aIpGQDI2Qt8HHY1zOVWv iz53aiFLFeIVhQlBmOABH2Ifr2M9loRC9yOyGcE2GhlzgyHGlQxEVGFn/QptX6iYbtaTBTU0 c72rpmbe1Nec6hWuzSwu2uE8lF+HYcYi+22ml1XBHNMBeAdSEbSfDbwc///8QKtckUzbDvME S8j4KuqQhwvYkSg7dV9rs53WmjO2Wd4eygkC3tBhPM5s38/6CVGl3ABiWJs3kB08asUNy8Wk juusU/nRJbXDzxu1d+hv0d+s5NOBy/5+7Pa6HeyBnh1tUmCs5/f1D/cJnuzzYwAmZTHFUsfQ ygGBRRKpAVu0VxCFNPSYKW0ULi5eZV6bcj+NAhtafGsWcv8WPFXgVE8s2YU38D1VtlBvCo5/ 0MPtQORqAQ/Itag1EHHtnfuK3MBtA0fNxQbb2jha+/oMAi5hKpmB/zAlFoRtYHwjFPFldHfv Iljpe1S0rDASaF9NsQPfUBEm7dA5UUkyvvi00HZ3e7/uyBGb0QARAQABzSJBbmRyZWFzIEbD pHJiZXIgPGFmYWVyYmVyQHN1c2UuZGU+wsF7BBMBAgAlAhsDBgsJCAcDAgYVCAIJCgsEFgID AQIeAQIXgAUCTqGJnQIZAQAKCRD6LtEtPn4BPzetD/4rF6k/HF+9U9KqykfJaWdUHJvXpI85 Roab12rQbiIrL4hVEYKrYwPEKpCf+FthXpgOq+JdTGJ831DMlTx7Ed5/QJ9KAAQuhZlSNjSc +FNobJm7EbFv9jWFjQC0JcOl17Ji1ikgRcIRDCul1nQh9jCdfh1b848GerZmzteNdT9afRJm 7rrvMqXs1Y52/dTlfIW0ygMA2n5Vv3EwykXJOPF6fRimkErKO84sFMNg0eJV9mXs+Zyionfi g2sZJfVeKjkDqjxy7sDDBZZR68I9HWq5VJQrXqQkCZUvtr6TBLI+uiDLbGRUDNxA3wgjVdS2 v9bhjYceSOHpKU+h3H2S8ju9rjhOADT2F5lUQMTSpjlzglh8IatV5rXLGkXEyum4MzMo2sCE Cr+GD6i2M3pHCtaIVV3xV0nRGALa6DdF7jBWqM54KHaKsE883kFH2+6ARcPCPrnPm7LX98h2 4VpG984ysoq6fpzHHG/KCaYCEOe1bpr3Plmmp3sqj0utA6lwzJy0hj5dqug+lqmg7QKAnxl+ porgluoY56U0X0PIVBc0yO0dWqRxtylJa9kDX/TKwFYNVddMn2NQNjOJXzx2H9hf0We7rG7+ F/vgwALVVYbiTzvp2L0XATTv/oX4BHagAa/Qc3dIsBYJH+KVhBp+ZX4uguxk4xlc2hm75b1s cqeAD87BTQROlumUARAAzd7eu+tw/52FB7xQZWDv5aF+6CAkoz7AuY4s1fo0AQQDqjLOdpQF bifdH7B8SnsA4eo0syfs+1tZW6nn9hdy1GHEMbeuvdhNwkhEfYGDYpSue7oVxB4jajKvRHAP VcewKZIxvIiZ5aSp5n1Bd7B0c0C443DHiWE/0XWSpvbU7fTzTNvdz+2OZmGtqCn610gBqScv 1BOiP3OfLly8ghxcJsos23c0mkB/1iWlzh3UMFIGrzsK3sZJ/3uRaLYFimmqqPlSwFqx3b0M 1gFdHWKfOpvQ4wwP5P10xwvqNXLWC30wB1QmJGD/X8aAoVNnGsmEL7GcWF4cLoOSRidSoccz znShE+Ap+FVDD6MRyesNT4D67l792//B38CGJRdELtNacdwazaFgxH9O85Vnd70ZC7fIcwzG yg/4ZEf96DlAvrSOnu/kgklofEYdzpZmW+Fqas6cnk6ZaHa35uHuBPesdE13MVz5TeiHGQTW xP1jbgWQJGPvJZ+htERT8SZGBQRb1paoRd1KWQ1mlr3CQvXtfA/daq8p/wL48sXrKNwedrLV iZOeJOFwfpJgsFU4xLoO/8N0RNFsnelBgWgZE3ZEctEd4BsWFUw+czYCPYfqOcJ556QUGA9y DeDcxSitpYrNIvpk4C5CHbvskVLKPIUVXxTNl8hAGo1Ahm1VbNkYlocAEQEAAcLBXwQYAQIA CQUCTpbplAIbDAAKCRD6LtEtPn4BPzA6D/9TbSBOPM99SHPX9JiEQAw4ITCBF2oTWeZQ6RJg RKpB15lzyPfyFbNSceJp9dCiwDWe+pzKaX6KYOFZ5+YTS0Ph2eCR+uT2l6Mt6esAun8dvER/ xlPDW7p88dwGUcV8mHEukWdurSEDTj8V3K29vpgvIgRq2lHCn2wqRQBGpiJAt72Vg0HxUlwN GAJNvhpeW8Yb43Ek7lWExkUgOfNsDCTvDInF8JTFtEXMnUcPxC0d/GdAuvBilL9SlmzvoDIZ 5k2k456bkY3+3/ydDvKU5WIgThydyCEQUHlmE6RdA3C1ccIrIvKjVEwSH27Pzy5jKQ78qnhv dtLLAavOXyBJnOGlNDOpOyBXfv02x91RoRiyrSIM7dKmMEINKQlAMgB/UU/6B+mvzosbs5d3 4FPzBLuuRz9WYzXmnC460m2gaEVk1GjpidBWw0yY6kgnAM3KhwCFSecqUQCvwKFDGSXDDbCr w08b3GDk40UoCoUq9xrGfhlf05TUSFTg2NlSrK7+wAEsTUgs2ZYLpHyEeftoDDnKpM4ghs/O ceCeyZUP1zSgRSjgITQp691Uli5Nd1mIzaaM8RjOE/Rw67FwgblKR6HAhSy/LYw1HVOu+Ees RAEdbtRt37A8brlb/ENxbLd9SGC8/j20FQjit7oPNMkTJDs7Uo2eb7WxOt5pSTVVqZkv7Q== Organization: SUSE Linux GmbH Message-ID: <0aa77961-fe60-6afe-e6c5-d2db4250cb22@suse.de> Date: Fri, 10 Aug 2018 19:45:42 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 10.08.2018 um 19:34 schrieb Rob Herring: > On Sun, Aug 5, 2018 at 5:27 PM Andreas Färber wrote: >> >> This is to allow using serdev. >> >> Signed-off-by: Andreas Färber >> --- >> drivers/tty/serial/sc16is7xx.c | 25 +++++++++++++++++++++++++ >> 1 file changed, 25 insertions(+) >> >> diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c >> index 243c96025053..ad7267274f65 100644 >> --- a/drivers/tty/serial/sc16is7xx.c >> +++ b/drivers/tty/serial/sc16is7xx.c >> @@ -1213,9 +1213,31 @@ static int sc16is7xx_probe(struct device *dev, >> SC16IS7XX_IOCONTROL_SRESET_BIT); >> >> for (i = 0; i < devtype->nr_uart; ++i) { >> +#ifdef CONFIG_OF >> + struct device_node *np; >> + struct platform_device *pdev; >> + char name[6] = "uartx"; >> +#endif >> + >> s->p[i].line = i; >> /* Initialize port data */ >> +#ifdef CONFIG_OF >> + name[4] = '0' + i; >> + np = of_get_child_by_name(dev->of_node, name); >> + if (IS_ERR(np)) { >> + ret = PTR_ERR(np); >> + goto out_ports; >> + } >> + pdev = of_platform_device_create(np, NULL, dev); > > Ideally, you would use of_platform_default_populate here. I think > you'd have to add a compatible to the child nodes, but that wouldn't > be a bad thing. I could envision that the child nodes ultimately > become their own driver utilizing the standard 8250 driver and a > compatible string would be needed in that case. Separate compatibles would mean separate drivers. Unlike your DUART example this is not an MMIO device that we can easily split but a SPI slave (well, regmap due to some I2C models). I don't see how separate drivers could work, given that the whole spi_device has a single interrupt for all functions of this device. That left me with this ugly but working construct. Is the uartX naming correct, or should it be serialX? Regards, Andreas > > You'd then have to loop over each child of 'dev' instead of the DT nodes. > >> + if (IS_ERR(pdev)) { >> + ret = PTR_ERR(pdev); >> + goto out_ports; >> + } >> + platform_set_drvdata(pdev, dev_get_drvdata(dev)); >> + s->p[i].port.dev = &pdev->dev; >> +#else >> s->p[i].port.dev = dev; >> +#endif >> s->p[i].port.irq = irq; >> s->p[i].port.type = PORT_SC16IS7XX; >> s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE; -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg)