Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754490AbbKXPIJ (ORCPT ); Tue, 24 Nov 2015 10:08:09 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:44670 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753613AbbKXPIH (ORCPT ); Tue, 24 Nov 2015 10:08:07 -0500 From: Geert Uytterhoeven To: Thomas Gleixner , Jason Cooper , Marc Zyngier , Magnus Damm Cc: linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH] irqchip/renesas-intc-irqpin: Improve clock error handling and reporting Date: Tue, 24 Nov 2015 16:08:13 +0100 Message-Id: <1448377693-19597-1-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4899 Lines: 149 If the Renesas External IRQ Pin driver cannot find a functional clock, it prints a warning, .e.g. renesas_intc_irqpin fe78001c.interrupt-controller: unable to get clock and continues, as the clock is optional, depending on the SoC type. This warning may confuse users. To fix this, add a flag to indicate that the clock is mandatory or optional, and add a few more compatible entries: - If the clock is mandatory (on R-Mobile A1 or SH-Mobile AG5), a missing clock is now treated as a fatal error, - If the clock is optional (on R-Car Gen1, or using the generic "renesas,intc-irqpin" compatible value), the warning is no longer printed. This requires making struct intc_irqpin_irlm_config more generic by renaming it to intc_irqpin_config, and adding a flag to indicate if IRLM is needed. The new clock flag is merged with the existing shared_irqs boolean into a bitfield to save space. Suggested-by: Magnus Damm Signed-off-by: Geert Uytterhoeven --- Tested on - r8a7779/marzen (no functional clock), - r8a7740/armadillo (with and without mandatory functional clock), - sh73a0/kzm9g (with and without mandatory functional clock). drivers/irqchip/irq-renesas-intc-irqpin.c | 45 ++++++++++++++++++++++--------- 1 file changed, 33 insertions(+), 12 deletions(-) diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c index 7f6cf19aa6ac00d7..713177d97c7aa0b6 100644 --- a/drivers/irqchip/irq-renesas-intc-irqpin.c +++ b/drivers/irqchip/irq-renesas-intc-irqpin.c @@ -79,12 +79,15 @@ struct intc_irqpin_priv { struct irq_chip irq_chip; struct irq_domain *irq_domain; struct clk *clk; - bool shared_irqs; + unsigned shared_irqs:1; + unsigned needs_clk:1; u8 shared_irq_mask; }; -struct intc_irqpin_irlm_config { +struct intc_irqpin_config { unsigned int irlm_bit; + unsigned needs_irlm:1; + unsigned needs_clk:1; }; static unsigned long intc_irqpin_read32(void __iomem *iomem) @@ -359,8 +362,15 @@ static const struct irq_domain_ops intc_irqpin_irq_domain_ops = { .xlate = irq_domain_xlate_twocell, }; -static const struct intc_irqpin_irlm_config intc_irqpin_irlm_r8a777x = { +static const struct intc_irqpin_config intc_irqpin_irlm_r8a777x = { .irlm_bit = 23, /* ICR0.IRLM0 */ + .needs_irlm = 1, + .needs_clk = 0, +}; + +static const struct intc_irqpin_config intc_irqpin_rmobile = { + .needs_irlm = 0, + .needs_clk = 1, }; static const struct of_device_id intc_irqpin_dt_ids[] = { @@ -369,12 +379,17 @@ static const struct of_device_id intc_irqpin_dt_ids[] = { .data = &intc_irqpin_irlm_r8a777x }, { .compatible = "renesas,intc-irqpin-r8a7779", .data = &intc_irqpin_irlm_r8a777x }, + { .compatible = "renesas,intc-irqpin-r8a7740", + .data = &intc_irqpin_rmobile }, + { .compatible = "renesas,intc-irqpin-sh73a0", + .data = &intc_irqpin_rmobile }, {}, }; MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids); static int intc_irqpin_probe(struct platform_device *pdev) { + const struct intc_irqpin_config *config = NULL; struct device *dev = &pdev->dev; const struct of_device_id *of_id; struct intc_irqpin_priv *p; @@ -407,9 +422,19 @@ static int intc_irqpin_probe(struct platform_device *pdev) p->pdev = pdev; platform_set_drvdata(pdev, p); + of_id = of_match_device(intc_irqpin_dt_ids, dev); + if (of_id && of_id->data) { + config = of_id->data; + p->needs_clk = config->needs_clk; + } + p->clk = devm_clk_get(dev, NULL); if (IS_ERR(p->clk)) { - dev_warn(dev, "unable to get clock\n"); + if (p->needs_clk) { + dev_err(dev, "unable to get clock\n"); + ret = PTR_ERR(p->clk); + goto err0; + } p->clk = NULL; } @@ -479,14 +504,10 @@ static int intc_irqpin_probe(struct platform_device *pdev) } /* configure "individual IRQ mode" where needed */ - of_id = of_match_device(intc_irqpin_dt_ids, dev); - if (of_id && of_id->data) { - const struct intc_irqpin_irlm_config *irlm_config = of_id->data; - + if (config && config->needs_irlm) { if (io[INTC_IRQPIN_REG_IRLM]) intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_IRLM, - irlm_config->irlm_bit, - 1, 1); + config->irlm_bit, 1, 1); else dev_warn(dev, "unable to select IRLM mode\n"); } @@ -500,10 +521,10 @@ static int intc_irqpin_probe(struct platform_device *pdev) /* scan for shared interrupt lines */ ref_irq = p->irq[0].requested_irq; - p->shared_irqs = true; + p->shared_irqs = 1; for (k = 1; k < nirqs; k++) { if (ref_irq != p->irq[k].requested_irq) { - p->shared_irqs = false; + p->shared_irqs = 0; break; } } -- 1.9.1 -- 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/