From patchwork Fri Feb 7 14:59:15 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Genoud X-Patchwork-Id: 3605881 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7258ABF418 for ; Fri, 7 Feb 2014 15:09:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 34668200F4 for ; Fri, 7 Feb 2014 15:09:37 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 23C1C20154 for ; Fri, 7 Feb 2014 15:09:35 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WBn0v-0003ht-Uy; Fri, 07 Feb 2014 15:06:48 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WBmvy-0004JJ-88; Fri, 07 Feb 2014 15:01:38 +0000 Received: from mail-wi0-x22c.google.com ([2a00:1450:400c:c05::22c]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WBmvD-0004DR-Q1 for linux-arm-kernel@lists.infradead.org; Fri, 07 Feb 2014 15:01:00 +0000 Received: by mail-wi0-f172.google.com with SMTP id e4so921998wiv.11 for ; Fri, 07 Feb 2014 07:00:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=9hKN5xqNPohcq1MlhdH7Xvnw2xBVXb6hioC8xFR5ocE=; b=vma+6oDqVPg8P1XRqTiZ0caRriIFXH6hEZhqOokOH0rlBiFLNuAU1MDUKXnxkSObiC 98iLcVADUeTjydNdQyGecSaEuwSy2p8IxzfqOtilW8yXDU8bCmHGerQDUCP5KEF5osef hkyWb7VaMRHCLhASzeXo9OZzSqkbNrHxndy73gM7vCWu7+2gwA50owd44e4s+m+mF37I m+9GWC9jUoQCO9yLbWBJl9EMHbxnjeGubeK/79/kS/D71lQNx4iQpqD7IedHy5UY3xfZ tRFKKJ04MJFKGrxQH7N4LrWQ7AJ6GlXSu7SqNsjoG8CajLMcFwq15sr6Gr3pJbD6LK2C FqCw== X-Received: by 10.194.185.165 with SMTP id fd5mr5194wjc.95.1391785229628; Fri, 07 Feb 2014 07:00:29 -0800 (PST) Received: from lnx-rg.pr (lyon.paratronic.fr. [213.41.177.106]) by mx.google.com with ESMTPSA id ha1sm11330842wjc.23.2014.02.07.07.00.28 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 Feb 2014 07:00:29 -0800 (PST) From: Richard Genoud To: Greg Kroah-Hartman Subject: [PATCH 8/8] tty/serial: at91: add dcd control via gpio Date: Fri, 7 Feb 2014 15:59:15 +0100 Message-Id: <1391785155-18525-9-git-send-email-richard.genoud@gmail.com> X-Mailer: git-send-email 1.8.5 In-Reply-To: <1391785155-18525-1-git-send-email-richard.genoud@gmail.com> References: <1391785155-18525-1-git-send-email-richard.genoud@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140207_100052_233316_1CAF5122 X-CRM114-Status: GOOD ( 18.19 ) X-Spam-Score: -2.0 (--) Cc: Richard Genoud , Linus Walleij , Nicolas Ferre , linux-serial@vger.kernel.org, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On sam9x5, the USART controller doesn't handle DTR/DSR/DCD/RI signals, so we have to control them via GPIO. This patch permits to use a GPIO to control the DCD signal. Signed-off-by: Richard Genoud --- .../devicetree/bindings/serial/atmel-usart.txt | 3 ++ arch/arm/mach-at91/at91rm9200_devices.c | 5 +++ arch/arm/mach-at91/at91sam9260_devices.c | 7 ++++ arch/arm/mach-at91/at91sam9261_devices.c | 4 +++ arch/arm/mach-at91/at91sam9263_devices.c | 4 +++ arch/arm/mach-at91/at91sam9g45_devices.c | 5 +++ arch/arm/mach-at91/at91sam9rl_devices.c | 5 +++ drivers/tty/serial/atmel_serial.c | 38 ++++++++++++++++++++-- include/linux/platform_data/atmel.h | 1 + 9 files changed, 69 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/serial/atmel-usart.txt b/Documentation/devicetree/bindings/serial/atmel-usart.txt index 11d033649b19..4ff660e1487f 100644 --- a/Documentation/devicetree/bindings/serial/atmel-usart.txt +++ b/Documentation/devicetree/bindings/serial/atmel-usart.txt @@ -23,6 +23,8 @@ Optional properties: function pin for the USART DSR feature. If unsure, don't specify this property. - ri-gpios: specify a GPIO for Ring line. It will use specified PIO instead of the peripheral function pin for the USART Ring feature. If unsure, don't specify this property. +- dcd-gpios: specify a GPIO for DCD line. It will use specified PIO instead of the peripheral + function pin for the USART DCD feature. If unsure, don't specify this property. - add dma bindings for dma transfer: - dmas: DMA specifier, consisting of a phandle to DMA controller node, memory peripheral interface and USART DMA channel ID, FIFO configuration. @@ -48,6 +50,7 @@ Example: dtr-gpios = <&pioD 17 0>; dsr-gpios = <&pioD 18 0>; ri-gpios = <&pioD 19 0>; + dcd-gpios = <&pioD 20 0>; }; - use DMA: diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c index 11c5c7f5b067..288421f38b42 100644 --- a/arch/arm/mach-at91/at91rm9200_devices.c +++ b/arch/arm/mach-at91/at91rm9200_devices.c @@ -927,6 +927,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -970,6 +971,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -1025,6 +1027,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -1081,6 +1084,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); @@ -1129,6 +1133,7 @@ static struct atmel_uart_data uart3_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart3_dmamask = DMA_BIT_MASK(32); diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c index f8ccdbe2bcbc..0e20ba04d43f 100644 --- a/arch/arm/mach-at91/at91sam9260_devices.c +++ b/arch/arm/mach-at91/at91sam9260_devices.c @@ -824,6 +824,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -867,6 +868,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -923,6 +925,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -971,6 +974,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); @@ -1019,6 +1023,7 @@ static struct atmel_uart_data uart3_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart3_dmamask = DMA_BIT_MASK(32); @@ -1067,6 +1072,7 @@ static struct atmel_uart_data uart4_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart4_dmamask = DMA_BIT_MASK(32); @@ -1110,6 +1116,7 @@ static struct atmel_uart_data uart5_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart5_dmamask = DMA_BIT_MASK(32); diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c index c40aa819cfac..d3d7a546db9b 100644 --- a/arch/arm/mach-at91/at91sam9261_devices.c +++ b/arch/arm/mach-at91/at91sam9261_devices.c @@ -885,6 +885,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -928,6 +929,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -976,6 +978,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -1024,6 +1027,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c index 1da08465d952..5fcb2a0383d1 100644 --- a/arch/arm/mach-at91/at91sam9263_devices.c +++ b/arch/arm/mach-at91/at91sam9263_devices.c @@ -1329,6 +1329,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -1372,6 +1373,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -1420,6 +1422,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -1468,6 +1471,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c index 4520d8f70cff..bd44970403e5 100644 --- a/arch/arm/mach-at91/at91sam9g45_devices.c +++ b/arch/arm/mach-at91/at91sam9g45_devices.c @@ -1592,6 +1592,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -1635,6 +1636,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -1683,6 +1685,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -1731,6 +1734,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); @@ -1779,6 +1783,7 @@ static struct atmel_uart_data uart3_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart3_dmamask = DMA_BIT_MASK(32); diff --git a/arch/arm/mach-at91/at91sam9rl_devices.c b/arch/arm/mach-at91/at91sam9rl_devices.c index 5916d65b6362..e43623dc1c9e 100644 --- a/arch/arm/mach-at91/at91sam9rl_devices.c +++ b/arch/arm/mach-at91/at91sam9rl_devices.c @@ -961,6 +961,7 @@ static struct atmel_uart_data dbgu_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 dbgu_dmamask = DMA_BIT_MASK(32); @@ -1004,6 +1005,7 @@ static struct atmel_uart_data uart0_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart0_dmamask = DMA_BIT_MASK(32); @@ -1060,6 +1062,7 @@ static struct atmel_uart_data uart1_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart1_dmamask = DMA_BIT_MASK(32); @@ -1108,6 +1111,7 @@ static struct atmel_uart_data uart2_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart2_dmamask = DMA_BIT_MASK(32); @@ -1156,6 +1160,7 @@ static struct atmel_uart_data uart3_data = { .dtr_gpio = -EINVAL, .dsr_gpio = -EINVAL, .ri_gpio = -EINVAL, + .dcd_gpio = -EINVAL, }; static u64 uart3_dmamask = DMA_BIT_MASK(32); diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 9d47497713ab..926f77e6bde5 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -138,6 +138,8 @@ struct gpio_lines { int dsr_irq; int ri; /* optional Ring GPIO */ int ri_irq; + int dcd; /* optional DCD GPIO */ + int dcd_irq; }; /* @@ -280,6 +282,13 @@ static unsigned int atmel_get_lines_status(struct uart_port *port) status &= ~ATMEL_US_RI; } + if (gpio_is_valid(atmel_port->gpio.dcd)) { + if (gpio_get_value(atmel_port->gpio.dcd)) + status |= ATMEL_US_DCD; + else + status &= ~ATMEL_US_DCD; + } + return status; } @@ -503,7 +512,7 @@ static void atmel_stop_rx(struct uart_port *port) static void atmel_enable_ms(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); - uint32_t ier; + uint32_t ier = 0; /* * Interrupt should not be enabled twice @@ -513,8 +522,6 @@ static void atmel_enable_ms(struct uart_port *port) atmel_port->ms_irq_enabled = true; - ier = ATMEL_US_DCDIC; - if (atmel_port->gpio.cts_irq != INVALID_IRQ) enable_irq(atmel_port->gpio.cts_irq); else @@ -530,6 +537,11 @@ static void atmel_enable_ms(struct uart_port *port) else ier |= ATMEL_US_RIIC; + if (atmel_port->gpio.dcd_irq != INVALID_IRQ) + enable_irq(atmel_port->gpio.dcd_irq); + else + ier |= ATMEL_US_DCDIC; + UART_PUT_IER(port, ier); } @@ -1142,6 +1154,10 @@ static irqreturn_t atmel_interrupt(int irq, void *dev_id) (irq == atmel_port->gpio.ri_irq)) pending |= ATMEL_US_RIIC; + if ((irq != INVALID_IRQ) && + (irq == atmel_port->gpio.dcd_irq)) + pending |= ATMEL_US_DCDIC; + gpio_handled = true; } if (!pending) @@ -1685,6 +1701,11 @@ static int atmel_startup(struct uart_port *port) if (retval) goto free_dsr_irq; + retval = atmel_request_gpio_irq(port, atmel_port->gpio.dcd_irq, + "atmel_dcd_irq"); + if (retval) + goto free_ri_irq; + /* * Initialize DMA (if necessary) */ @@ -1750,6 +1771,9 @@ static int atmel_startup(struct uart_port *port) return 0; +free_ri_irq: + free_irq(atmel_port->gpio.ri_irq, port); + free_dsr_irq: free_irq(atmel_port->gpio.dsr_irq, port); @@ -1816,6 +1840,8 @@ static void atmel_shutdown(struct uart_port *port) free_irq(atmel_port->gpio.dsr_irq, port); if (atmel_port->gpio.ri_irq != INVALID_IRQ) free_irq(atmel_port->gpio.ri_irq, port); + if (atmel_port->gpio.dcd_irq != INVALID_IRQ) + free_irq(atmel_port->gpio.dcd_irq, port); atmel_port->ms_irq_enabled = false; } @@ -2525,6 +2551,8 @@ static int atmel_init_gpios(struct atmel_uart_port *atmel_port, "DSR", &atmel_port->gpio.dsr_irq); ret += atmel_request_gpio(&pdev->dev, atmel_port->gpio.ri, "RI", &atmel_port->gpio.ri_irq); + ret += atmel_request_gpio(&pdev->dev, atmel_port->gpio.dcd, + "DCD", &atmel_port->gpio.dcd_irq); return ret; } @@ -2568,21 +2596,25 @@ static int atmel_serial_probe(struct platform_device *pdev) port->gpio.dtr = -EINVAL; port->gpio.dsr = -EINVAL; port->gpio.ri = -EINVAL; + port->gpio.dcd = -EINVAL; port->gpio.cts_irq = INVALID_IRQ; port->gpio.dsr_irq = INVALID_IRQ; port->gpio.ri_irq = INVALID_IRQ; + port->gpio.dcd_irq = INVALID_IRQ; if (pdata) { port->gpio.rts = pdata->rts_gpio; port->gpio.cts = pdata->cts_gpio; port->gpio.dtr = pdata->dtr_gpio; port->gpio.dsr = pdata->dsr_gpio; port->gpio.ri = pdata->ri_gpio; + port->gpio.dcd = pdata->dcd_gpio; } else if (np) { port->gpio.rts = of_get_named_gpio(np, "rts-gpios", 0); port->gpio.cts = of_get_named_gpio(np, "cts-gpios", 0); port->gpio.dtr = of_get_named_gpio(np, "dtr-gpios", 0); port->gpio.dsr = of_get_named_gpio(np, "dsr-gpios", 0); port->gpio.ri = of_get_named_gpio(np, "ri-gpios", 0); + port->gpio.dcd = of_get_named_gpio(np, "dcd-gpios", 0); } ret = atmel_init_gpios(port, pdev); diff --git a/include/linux/platform_data/atmel.h b/include/linux/platform_data/atmel.h index ce6ca1b8aef3..565c5c693c7f 100644 --- a/include/linux/platform_data/atmel.h +++ b/include/linux/platform_data/atmel.h @@ -88,6 +88,7 @@ struct atmel_uart_data { int cts_gpio; /* optional CTS GPIO */ int dtr_gpio; /* optional DTR GPIO */ int dsr_gpio; /* optional DSR GPIO */ + int dcd_gpio; /* optional DCD GPIO */ int ri_gpio; /* optional Ring GPIO */ };