Without the clock, the keyboard controller won't operate. Tested on an OLPC XO 1.75.
Signed-off-by: Lubomir Rintel <[email protected]> --- 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"); @@ -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) -- 2.17.1
