On Thu, 22 Sep 2011, Josh Wu wrote:
> This patch
> 1. add ISI_MCK parent setting code when add ISI device.
> 2. add ov2640 support on board file.
> 3. define isi_mck clock in sam9g45 chip file.
>
> Signed-off-by: Josh Wu <josh...@atmel.com>
Looking a bit more at this, I think, the arch maintainer might want to
take a closer look at this:
1. Wouldn't it be a good idea to also bind the isi_clk via a clock
connection ID and not via the clock's name?
2. pck1 is not really dedicated to ISI on sam9g45. It can also be used,
e.g., as a generic clock output and ISI_PCK can be supplied by an external
oscillator. Such set up seems perfectly valid to me and your patch would
just unconditionally grab PCK1 and configure it to some frequency... I
think, this shall be improved.
3.
> +static int __init isi_set_clk_parent(void)
> +{
> + struct clk *pck1;
> + struct clk *plla;
> + int ret;
> +
> + /* ISI_MCK is supplied by PCK1 - set parent for it. */
> + pck1 = clk_get(NULL, "pck1");
> + if (IS_ERR(pck1)) {
> + printk(KERN_ERR "Failed to get PCK1\n");
> + ret = PTR_ERR(pck1);
> + goto err;
> + }
> +
> + plla = clk_get(NULL, "plla");
> + if (IS_ERR(plla)) {
> + printk(KERN_ERR "Failed to get PLLA\n");
> + ret = PTR_ERR(plla);
> + goto err_pck1;
> + }
> + ret = clk_set_parent(pck1, plla);
> + clk_put(plla);
I think, here you also need a
clk_put(pck1);
> + if (ret != 0) {
> + printk(KERN_ERR "Failed to set PCK1 parent\n");
> + goto err_pck1;
> + }
> + return ret;
> +
> +err_pck1:
> + clk_put(pck1);
> +err:
> + return ret;
> +}
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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