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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-11-24 16:08:13 +0100
committerJason Cooper <jason@lakedaemon.net>2015-11-24 16:54:19 +0000
commit86e57ca735a72b44aab90a649157a678b7069a6d (patch)
treee38a3ad8ad6d7428167f6275925545fb52560f37 /drivers/irqchip/irq-renesas-intc-irqpin.c
parent1affe5946f7293b3747bfe7ef25dc5cfe9869012 (diff)
downloadlinux-86e57ca735a72b44aab90a649157a678b7069a6d.tar.bz2
irqchip/renesas-intc-irqpin: Improve clock error handling and reporting
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 <magnus.damm@gmail.com> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lkml.kernel.org/r/1448377693-19597-1-git-send-email-geert+renesas@glider.be Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/irqchip/irq-renesas-intc-irqpin.c')
-rw-r--r--drivers/irqchip/irq-renesas-intc-irqpin.c45
1 files changed, 33 insertions, 12 deletions
diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index 7f6cf19aa6ac..713177d97c7a 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;
}
}