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SubjectRe: [PATCH v2 7/8] Input: olpc_apsp: enable the SP clock
On Wed, Oct 10, 2018 at 04:25:03PM +0200, Lubomir Rintel wrote:
> Without the clock, the keyboard controller won't operate.
> Tested on an OLPC XO 1.75.
>
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> ---
> drivers/input/serio/olpc_apsp.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/input/serio/olpc_apsp.c b/drivers/input/serio/olpc_apsp.c
> index 8b19a47dfa46..fe9e19014e70 100644
> --- a/drivers/input/serio/olpc_apsp.c
> +++ b/drivers/input/serio/olpc_apsp.c
> @@ -23,6 +23,7 @@
> #include <linux/of.h>
> #include <linux/slab.h>
> #include <linux/delay.h>
> +#include <linux/clk.h>
>
> /*
> * The OLPC XO-1.75 and XO-4 laptops do not have a hardware PS/2 controller.
> @@ -74,6 +75,7 @@ struct olpc_apsp {
> struct serio *kbio;
> struct serio *padio;
> void __iomem *base;
> + struct clk *clk;
> int open_count;
> int irq;
> };
> @@ -146,8 +148,13 @@ static int olpc_apsp_open(struct serio *port)
> struct olpc_apsp *priv = port->port_data;
> unsigned int tmp;
> unsigned long l;
> + int error;
>
> if (priv->open_count++ == 0) {
> + error = clk_prepare_enable(priv->clk);
> + if (error)
> + return error;
> +
> l = readl(priv->base + COMMAND_FIFO_STATUS);
> if (!(l & CMD_STS_MASK)) {
> dev_err(priv->dev, "SP cannot accept commands.\n");

I think you need to disable clock here.

> @@ -171,6 +178,8 @@ static void olpc_apsp_close(struct serio *port)
> /* Disable interrupt 0 */
> tmp = readl(priv->base + PJ_INTERRUPT_MASK);
> writel(tmp | INT_0, priv->base + PJ_INTERRUPT_MASK);
> +
> + clk_disable_unprepare(priv->clk);
> }
> }
>
> @@ -198,6 +207,10 @@ static int olpc_apsp_probe(struct platform_device *pdev)
> if (priv->irq < 0)
> return priv->irq;
>
> + priv->clk = devm_clk_get(&pdev->dev, "sp");
> + if (IS_ERR(priv->clk))
> + return PTR_ERR(priv->clk);
> +
> /* KEYBOARD */
> kb_serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
> if (!kb_serio)
> --
> 2.19.0
>

--
Dmitry

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