* Hard coded register address in "drm: rcar-du: Add DPLL support"?
@ 2016-05-18 14:29 Dirk Behme
2016-05-20 7:28 ` Dirk Behme
0 siblings, 1 reply; 2+ messages in thread
From: Dirk Behme @ 2016-05-18 14:29 UTC (permalink / raw)
To: linux-renesas-soc, Geert Uytterhoeven, Koji Matsuoka
Hi,
I'm not sure on which mailing list this
https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git/commit/drivers/gpu/drm/rcar-du/rcar_du_crtc.c?h=topic/gen3-latest&id=e297be92f09a9e8f9a63e72b8d69440dbf5bbabe
drm: rcar-du: Add DPLL support
is discussed.
But it's the same like with the hard coded MODEMR register: We don't
want the hard coded
#define PRODUCT_REG 0xfff00044
here.
Are there already patches or plans to convert this to a device tree
based interface?
Best regards
Dirk
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Hard coded register address in "drm: rcar-du: Add DPLL support"?
2016-05-18 14:29 Hard coded register address in "drm: rcar-du: Add DPLL support"? Dirk Behme
@ 2016-05-20 7:28 ` Dirk Behme
0 siblings, 0 replies; 2+ messages in thread
From: Dirk Behme @ 2016-05-20 7:28 UTC (permalink / raw)
To: linux-renesas-soc, Geert Uytterhoeven, Koji Matsuoka
On 18.05.2016 16:29, Dirk Behme wrote:
> Hi,
>
> I'm not sure on which mailing list this
>
> https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git/commit/drivers/gpu/drm/rcar-du/rcar_du_crtc.c?h=topic/gen3-latest&id=e297be92f09a9e8f9a63e72b8d69440dbf5bbabe
>
> drm: rcar-du: Add DPLL support
>
> is discussed.
>
> But it's the same like with the hard coded MODEMR register: We don't
> want the hard coded
>
> #define PRODUCT_REG 0xfff00044
>
> here.
>
> Are there already patches or plans to convert this to a device tree
> based interface?
Looking into the HW documentation for the product register, this seems
to be not associated with any hardware block (IP block), but 'just' a
register somewhere in the address space. Documented in the appendix.
So a device tree based access function for this could be simple. E.g.
like below [1].
What do you think about this? Where would we put code like this?
drivers/misc?
Best regards
Dirk
[1]
static struct of_device_id rcar_gen3_prr_ids[] __initdata = {
{ .compatible = "renesas,rcar-gen3-prr" },
{}
};
int __init rcar_gen3_read_product(u32 *prr)
{
void __iomem *product;
struct device_node *np;
np = of_find_matching_node(NULL, rcar_gen3_prr_ids);
if (!np) {
pr_err("can't find Renesas rcar-gen3-prr device node");
return -ENOMEM;
}
product = of_iomap(np, 0);
prr = ioread32(product);
iounmap(product);
of_node_put(np);
return 0;
}
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