From patchwork Thu Jan 2 13:38:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 11315807 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D7EE1138C for ; Thu, 2 Jan 2020 14:04:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3A6A21734 for ; Thu, 2 Jan 2020 14:04:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728393AbgABOEn (ORCPT ); Thu, 2 Jan 2020 09:04:43 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:58538 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728429AbgABOEn (ORCPT ); Thu, 2 Jan 2020 09:04:43 -0500 Received: from ramsan ([84.195.182.253]) by michel.telenet-ops.be with bizsmtp id lS4g210085USYZQ06S4g6J; Thu, 02 Jan 2020 15:04:41 +0100 Received: from rox.of.borg ([192.168.97.57]) by ramsan with esmtp (Exim 4.90_1) (envelope-from ) id 1in15c-0006GP-Dv; Thu, 02 Jan 2020 15:04:40 +0100 Received: from geert by rox.of.borg with local (Exim 4.90_1) (envelope-from ) id 1in0gG-0007ea-JH; Thu, 02 Jan 2020 14:38:28 +0100 From: Geert Uytterhoeven To: Mark Brown Cc: Chris Brandt , =?utf-8?q?Jan_Kundr=C3=A1t?= , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 6/6] spi: rspi: Add support for GPIO chip selects Date: Thu, 2 Jan 2020 14:38:22 +0100 Message-Id: <20200102133822.29346-7-geert+renesas@glider.be> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200102133822.29346-1-geert+renesas@glider.be> References: <20200102133822.29346-1-geert+renesas@glider.be> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Add support for GPIO chip selects using GPIO descriptors. As the RSPI controller always drives a native chip select when performing a transfer, at least one native chip select must be left unused. Signed-off-by: Geert Uytterhoeven --- drivers/spi/spi-rspi.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 2f5a856a93192702..85575d45901cee1b 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -242,6 +242,7 @@ struct spi_ops { u16 mode_bits; u16 flags; u16 fifo_size; + u8 num_hw_ss; }; /* @@ -934,7 +935,8 @@ static int rspi_prepare_message(struct spi_controller *ctlr, rspi->spcmd |= SPCMD_CPHA; /* Configure slave signal to assert */ - rspi->spcmd |= SPCMD_SSLA(spi->chip_select); + rspi->spcmd |= SPCMD_SSLA(spi->cs_gpiod ? rspi->ctlr->unused_native_cs + : spi->chip_select); /* CMOS output mode and MOSI signal from previous transfer */ rspi->sppcr = 0; @@ -1123,6 +1125,7 @@ static const struct spi_ops rspi_ops = { .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP, .flags = SPI_CONTROLLER_MUST_TX, .fifo_size = 8, + .num_hw_ss = 2, }; static const struct spi_ops rspi_rz_ops = { @@ -1131,6 +1134,7 @@ static const struct spi_ops rspi_rz_ops = { .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP, .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, .fifo_size = 8, /* 8 for TX, 32 for RX */ + .num_hw_ss = 1, }; static const struct spi_ops qspi_ops = { @@ -1141,6 +1145,7 @@ static const struct spi_ops qspi_ops = { SPI_RX_DUAL | SPI_RX_QUAD, .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, .fifo_size = 32, + .num_hw_ss = 1, }; #ifdef CONFIG_OF @@ -1256,6 +1261,8 @@ static int rspi_probe(struct platform_device *pdev) ctlr->mode_bits = ops->mode_bits; ctlr->flags = ops->flags; ctlr->dev.of_node = pdev->dev.of_node; + ctlr->use_gpio_descriptors = true; + ctlr->max_native_cs = rspi->ops->num_hw_ss; ret = platform_get_irq_byname_optional(pdev, "rx"); if (ret < 0) {