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SubjectRe: [PATCH 4/4] irq: imx: irqsteer: add multi output interrupts support
On Fri, Jan 25, 2019 at 6:55 PM Lucas Stach <l.stach@pengutronix.de> wrote:
>
> Am Freitag, den 18.01.2019, 07:53 +0000 schrieb Aisheng Dong:
> > One irqsteer channel can support up to 8 output interrupts.
> >
> > > Cc: Marc Zyngier <marc.zyngier@arm.com>
> > > Cc: Lucas Stach <l.stach@pengutronix.de>
> > > Cc: Shawn Guo <shawnguo@kernel.org>
> > > Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
> > ---
> > drivers/irqchip/irq-imx-irqsteer.c | 39 +++++++++++++++++++++++++++-----------
> > 1 file changed, 28 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
> > index 1bebf0a..54802fa 100644
> > --- a/drivers/irqchip/irq-imx-irqsteer.c
> > +++ b/drivers/irqchip/irq-imx-irqsteer.c
> > @@ -10,6 +10,7 @@
> > #include <linux/irqchip/chained_irq.h>
> > #include <linux/irqdomain.h>
> > #include <linux/kernel.h>
> > +#include <linux/of_irq.h>
> > #include <linux/of_platform.h>
> > #include <linux/spinlock.h>
> >
> > @@ -21,10 +22,13 @@
> > > #define CHAN_MINTDIS(t) (CTRL_STRIDE_OFF(t, 3) + 0x4)
> > > #define CHAN_MASTRSTAT(t) (CTRL_STRIDE_OFF(t, 3) + 0x8)
> >
> > > +#define CHAN_MAX_OUTPUT_INT 0x8
> > +
> > struct irqsteer_data {
> > > > void __iomem *regs;
> > > > struct clk *ipg_clk;
> > > > - int irq;
> > > > + int irq[CHAN_MAX_OUTPUT_INT];
> > > > + int irq_count;
> > > > raw_spinlock_t lock;
> > > > int reg_num;
> > > > int channel;
> > @@ -117,7 +121,7 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
> > > struct device_node *np = pdev->dev.of_node;
> > > struct irqsteer_data *data;
> > > struct resource *res;
> > > - int ret;
> > > + int i, ret;
> >
> > > data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> > > if (!data)
> > @@ -130,12 +134,6 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
> > > return PTR_ERR(data->regs);
> > > }
> >
> > > - data->irq = platform_get_irq(pdev, 0);
> > > - if (data->irq <= 0) {
> > > - dev_err(&pdev->dev, "failed to get irq\n");
> > > - return -ENODEV;
> > > - }
> > -
> > > data->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
> > > if (IS_ERR(data->ipg_clk)) {
> > > ret = PTR_ERR(data->ipg_clk);
> > @@ -177,8 +175,23 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
> > > return -ENOMEM;
> > > }
> >
> > > - irq_set_chained_handler_and_data(data->irq, imx_irqsteer_irq_handler,
> > > - data);
> > + data->irq_count = of_irq_count(np);
>
> We normally don't validate stuff that comes from the DT, but I guess it
> might be helpful to validate that the number of output irqs specified
> matches what the number of input irqs, i.e. there is one output irqs
> specified for each group of 64 inputs.
>

Sound like a good idea.
I think we can calculate the irq_count from irqs number instead of of_irq_count.
Then the following irq_of_parse_and_map() will validate them automatically.

However, i think we'd better to keep the irq_count range check as well.

> > + if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT) {
> > > + clk_disable_unprepare(data->ipg_clk);
> > > + return -EINVAL;
> > > + }
> > +
> > > + for (i = 0; i < data->irq_count; i++) {
> > > + data->irq[i] = irq_of_parse_and_map(np, i);
> > > + if (!data->irq[i]) {
> > > + clk_disable_unprepare(data->ipg_clk);
> > > + return -EINVAL;
> > > + }
> > +
> > > + irq_set_chained_handler_and_data(data->irq[i],
> > > + imx_irqsteer_irq_handler,
> > + data);
>
> We really want some data about the output irq being passed here, so we
> can cut down the number of register reads in the irq handler to the
> maximum of 2 status registers per group.
>

Will implement it and resend.

Regards
Dong Aisheng

> Regards,
> Lucas

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