From patchwork Mon Oct 17 09:16:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?C=C3=A9dric_Le_Goater?= X-Patchwork-Id: 13008405 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E9C3C4332F for ; Mon, 17 Oct 2022 09:18:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229990AbiJQJSY (ORCPT ); Mon, 17 Oct 2022 05:18:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230037AbiJQJST (ORCPT ); Mon, 17 Oct 2022 05:18:19 -0400 Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D13FC40561; Mon, 17 Oct 2022 02:18:02 -0700 (PDT) Received: from gandalf.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4MrWb55sqhz4xG9; Mon, 17 Oct 2022 20:16:49 +1100 (AEDT) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4MrWb20658z4xGG; Mon, 17 Oct 2022 20:16:45 +1100 (AEDT) From: =?utf-8?q?C=C3=A9dric_Le_Goater?= To: linux-spi@vger.kernel.org Cc: Mark Brown , Rob Herring , Krzysztof Kozlowski , devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org, Joel Stanley , Andrew Jeffery , Chin-Ting Kuo , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?C=C3=A9dric_Le_Goater?= Subject: [PATCH linux v2 3/3] spi: aspeed: Introduce a "ranges" debugfs file Date: Mon, 17 Oct 2022 11:16:24 +0200 Message-Id: <20221017091624.130227-4-clg@kaod.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221017091624.130227-1-clg@kaod.org> References: <20221017091624.130227-1-clg@kaod.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This dumps the mapping windows, or decoding ranges, of all devices possibly attached of the controller. To be noted that a top level "spi" debugfs directory is created to hold the intermediate directory of the driver instance. Cc: Chin-Ting Kuo Signed-off-by: Cédric Le Goater --- drivers/spi/spi-aspeed-smc.c | 66 +++++++++++++++++++++++++++++++++++- 1 file changed, 65 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-aspeed-smc.c b/drivers/spi/spi-aspeed-smc.c index 75e1d08bbd00..a79e5cc8ac5b 100644 --- a/drivers/spi/spi-aspeed-smc.c +++ b/drivers/spi/spi-aspeed-smc.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -102,6 +103,9 @@ struct aspeed_spi { u32 clk_freq; struct aspeed_spi_chip chips[ASPEED_SPI_MAX_NUM_CS]; +#if IS_ENABLED(CONFIG_DEBUG_FS) + struct dentry *debugfs; +#endif }; static u32 aspeed_spi_get_io_mode(const struct spi_mem_op *op) @@ -716,6 +720,65 @@ static void aspeed_spi_enable(struct aspeed_spi *aspi, bool enable) aspeed_spi_chip_enable(aspi, cs, enable); } +#if IS_ENABLED(CONFIG_DEBUG_FS) +static int aspeed_spi_ranges_debug_show(struct seq_file *m, void *private) +{ + struct aspeed_spi *aspi = m->private; + struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS] = { 0 }; + u32 cs; + + if (aspi->data == &ast2400_spi_data) + return 0; + + aspeed_spi_get_windows(aspi, windows); + + seq_puts(m, " offset size register\n"); + for (cs = 0; cs < aspi->data->max_cs; cs++) { + if (!windows[cs].reg) + seq_printf(m, "CE%d: disabled\n", cs); + else + seq_printf(m, "CE%d: 0x%.8x 0x%.8x 0x%x\n", cs, + windows[cs].offset, windows[cs].size, + windows[cs].reg); + } + return 0; +} +DEFINE_SHOW_ATTRIBUTE(aspeed_spi_ranges_debug); + +static int aspeed_spi_debugfs_init(struct spi_controller *ctlr) +{ + struct aspeed_spi *aspi = spi_controller_get_devdata(ctlr); + struct dentry *rootdir = NULL; + + rootdir = debugfs_lookup("spi", NULL); + if (!rootdir) + rootdir = debugfs_create_dir("spi", NULL); + + aspi->debugfs = debugfs_create_dir(dev_name(&ctlr->dev), rootdir); + if (!aspi->debugfs) + return -ENOMEM; + + debugfs_create_file("ranges", 0444, aspi->debugfs, (void *)aspi, + &aspeed_spi_ranges_debug_fops); + return 0; +} + +static void aspeed_spi_debugfs_remove(struct aspeed_spi *aspi) +{ + debugfs_remove_recursive(aspi->debugfs); +} + +#else +static inline int aspeed_spi_debugfs_init(struct spi_controller *ctlr) +{ + return 0; +} + +static inline void aspeed_spi_debugfs_remove(struct aspeed_spi *aspi) +{ +} +#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */ + static int aspeed_spi_chip_read_ranges(struct device_node *node, struct aspeed_spi *aspi) { const char *range_prop = "ranges"; @@ -845,7 +908,7 @@ static int aspeed_spi_probe(struct platform_device *pdev) dev_err(&pdev->dev, "spi_register_controller failed\n"); goto disable_clk; } - return 0; + return aspeed_spi_debugfs_init(ctlr); disable_clk: clk_disable_unprepare(aspi->clk); @@ -856,6 +919,7 @@ static int aspeed_spi_remove(struct platform_device *pdev) { struct aspeed_spi *aspi = platform_get_drvdata(pdev); + aspeed_spi_debugfs_remove(aspi); aspeed_spi_enable(aspi, false); clk_disable_unprepare(aspi->clk); return 0;