Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759616AbbFBRcm (ORCPT ); Tue, 2 Jun 2015 13:32:42 -0400 Received: from down.free-electrons.com ([37.187.137.238]:36266 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754224AbbFBRcj (ORCPT ); Tue, 2 Jun 2015 13:32:39 -0400 From: Antoine Tenart To: sebastian.hesselbarth@gmail.com, ezequiel.garcia@free-electrons.com, dwmw2@infradead.org, computersforpeace@gmail.com Cc: Antoine Tenart , boris.brezillon@free-electrons.com, zmxu@marvell.com, jszhang@marvell.com, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/7] mtd: pxa3xx_nand: add a non mandatory ECC clock Date: Tue, 2 Jun 2015 19:32:25 +0200 Message-Id: <1433266351-22587-2-git-send-email-antoine.tenart@free-electrons.com> X-Mailer: git-send-email 2.4.2 In-Reply-To: <1433266351-22587-1-git-send-email-antoine.tenart@free-electrons.com> References: <1433266351-22587-1-git-send-email-antoine.tenart@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3863 Lines: 121 Some controllers (as the coming Berlin nand controller) need to enable an ECC clock. Add support for this clock in the pxa3xx nand driver, and leave it as non mandatory. Signed-off-by: Antoine Tenart --- drivers/mtd/nand/pxa3xx_nand.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c index 42ad199ed63d..ae8a7b6b3e5c 100644 --- a/drivers/mtd/nand/pxa3xx_nand.c +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -180,7 +180,7 @@ struct pxa3xx_nand_info { struct nand_hw_control controller; struct platform_device *pdev; - struct clk *clk; + struct clk *clk, *ecc_clk; void __iomem *mmio_base; unsigned long mmio_phys; struct completion cmd_complete, dev_ready; @@ -1685,15 +1685,26 @@ static int alloc_nand_resource(struct platform_device *pdev) spin_lock_init(&chip->controller->lock); init_waitqueue_head(&chip->controller->wq); - info->clk = devm_clk_get(&pdev->dev, NULL); + info->clk = devm_clk_get(&pdev->dev, "nfc"); if (IS_ERR(info->clk)) { - dev_err(&pdev->dev, "failed to get nand clock\n"); - return PTR_ERR(info->clk); + info->clk = devm_clk_get(&pdev->dev, NULL); + + if (IS_ERR(info->clk)) { + dev_err(&pdev->dev, "failed to get nand clock\n"); + return PTR_ERR(info->clk); + } } ret = clk_prepare_enable(info->clk); if (ret < 0) return ret; + info->ecc_clk = devm_clk_get(&pdev->dev, "ecc"); + if (!IS_ERR(info->ecc_clk)) { + ret = clk_prepare_enable(info->ecc_clk); + if (ret < 0) + goto fail_disable_clk; + } + if (use_dma) { /* * This is a dirty hack to make this driver work from @@ -1710,7 +1721,7 @@ static int alloc_nand_resource(struct platform_device *pdev) dev_err(&pdev->dev, "no resource defined for data DMA\n"); ret = -ENXIO; - goto fail_disable_clk; + goto fail_disable_ecc_clk; } info->drcmr_dat = r->start; @@ -1719,7 +1730,7 @@ static int alloc_nand_resource(struct platform_device *pdev) dev_err(&pdev->dev, "no resource defined for cmd DMA\n"); ret = -ENXIO; - goto fail_disable_clk; + goto fail_disable_ecc_clk; } info->drcmr_cmd = r->start; } @@ -1729,14 +1740,14 @@ static int alloc_nand_resource(struct platform_device *pdev) if (irq < 0) { dev_err(&pdev->dev, "no IRQ resource defined\n"); ret = -ENXIO; - goto fail_disable_clk; + goto fail_disable_ecc_clk; } r = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->mmio_base = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(info->mmio_base)) { ret = PTR_ERR(info->mmio_base); - goto fail_disable_clk; + goto fail_disable_ecc_clk; } info->mmio_phys = r->start; @@ -1745,7 +1756,7 @@ static int alloc_nand_resource(struct platform_device *pdev) info->data_buff = kmalloc(info->buf_size, GFP_KERNEL); if (info->data_buff == NULL) { ret = -ENOMEM; - goto fail_disable_clk; + goto fail_disable_ecc_clk; } /* initialize all interrupts to be disabled */ @@ -1766,6 +1777,8 @@ static int alloc_nand_resource(struct platform_device *pdev) fail_free_buf: free_irq(irq, info); kfree(info->data_buff); +fail_disable_ecc_clk: + clk_disable_unprepare(info->ecc_clk); fail_disable_clk: clk_disable_unprepare(info->clk); return ret; @@ -1788,6 +1801,7 @@ static int pxa3xx_nand_remove(struct platform_device *pdev) pxa3xx_nand_free_buff(info); clk_disable_unprepare(info->clk); + clk_disable_unprepare(info->ecc_clk); for (cs = 0; cs < pdata->num_cs; cs++) nand_release(info->host[cs]->mtd); -- 2.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/