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SubjectRe: [PATCH v5 02/15] clk: at91: pmc: execute suspend/resume only for backup mode
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On 11/10/2021 at 13:27, Claudiu Beznea wrote:
> Before going to backup mode architecture specific PM code sets the first
> word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()).
> Thus take this into account when suspending/resuming clocks. This will
> avoid executing unnecessary instructions when suspending to non backup
> modes.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Ok to do it like this:
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>


> ---
> drivers/clk/at91/pmc.c | 39 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index b2806946a77a..517973062719 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -8,6 +8,7 @@
> #include <linux/clkdev.h>
> #include <linux/clk/at91_pmc.h>
> #include <linux/of.h>
> +#include <linux/of_address.h>
> #include <linux/mfd/syscon.h>
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
> @@ -110,13 +111,35 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
> }
>
> #ifdef CONFIG_PM
> +
> +/* Address in SECURAM that say if we suspend to backup mode. */
> +static void __iomem *at91_pmc_backup_suspend;
> +
> static int at91_pmc_suspend(void)
> {
> + unsigned int backup;
> +
> + if (!at91_pmc_backup_suspend)
> + return 0;
> +
> + backup = readl_relaxed(at91_pmc_backup_suspend);
> + if (!backup)
> + return 0;
> +
> return clk_save_context();
> }
>
> static void at91_pmc_resume(void)
> {
> + unsigned int backup;
> +
> + if (!at91_pmc_backup_suspend)
> + return;
> +
> + backup = readl_relaxed(at91_pmc_backup_suspend);
> + if (!backup)
> + return;
> +
> clk_restore_context();
> }
>
> @@ -144,6 +167,22 @@ static int __init pmc_register_ops(void)
> }
> of_node_put(np);
>
> + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
> + if (!np)
> + return -ENODEV;
> +
> + if (!of_device_is_available(np)) {
> + of_node_put(np);
> + return -ENODEV;
> + }
> + of_node_put(np);
> +
> + at91_pmc_backup_suspend = of_iomap(np, 0);
> + if (!at91_pmc_backup_suspend) {
> + pr_warn("%s(): unable to map securam\n", __func__);
> + return -ENOMEM;
> + }
> +
> register_syscore_ops(&pmc_syscore_ops);
>
> return 0;
>


--
Nicolas Ferre

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