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Subject[PATCH 09/16] soc: imx: gpcv2: add support for optional resets
Date
From: Lucas Stach <l.stach@pengutronix.de>

Normally the reset for the devices inside the power domain is
triggered automatically from the PGC in the power-up sequencing,
however on i.MX8MM this doesn't work for the GPU power domains.

Add support for triggering the reset explicitly during the power
up sequencing.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
drivers/soc/imx/gpcv2.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 640f4165cfba..4a2c2a255d1a 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -15,6 +15,7 @@
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <linux/sizes.h>
#include <dt-bindings/power/imx7-power.h>
#include <dt-bindings/power/imx8mq-power.h>
@@ -108,6 +109,7 @@ struct imx_pgc_domain {
struct generic_pm_domain genpd;
struct regmap *regmap;
struct regulator *regulator;
+ struct reset_control *reset;
struct clk_bulk_data *clks;
int num_clks;

@@ -163,6 +165,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
goto out_regulator_disable;
}

+ reset_control_assert(domain->reset);
+
if (domain->bits.pxx) {
/* request the domain to power up */
regmap_update_bits(domain->regmap, GPC_PU_PGC_SW_PUP_REQ,
@@ -185,6 +189,11 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
GPC_PGC_CTRL_PCR, 0);
}

+ /* delay for reset to propagate */
+ udelay(5);
+
+ reset_control_deassert(domain->reset);
+
/* request the ADB400 to power up */
if (domain->bits.hskreq) {
regmap_update_bits(domain->regmap, GPC_PU_PWRHSK,
@@ -531,11 +540,17 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
domain->voltage, domain->voltage);
}

+
domain->num_clks = devm_clk_bulk_get_all(domain->dev, &domain->clks);
if (domain->num_clks < 0)
return dev_err_probe(domain->dev, domain->num_clks,
"Failed to get domain's clocks\n");

+ domain->reset = devm_reset_control_array_get_optional_exclusive(domain->dev);
+ if (IS_ERR(domain->reset))
+ return dev_err_probe(domain->dev, PTR_ERR(domain->reset),
+ "Failed to get domain's resets\n");
+
pm_runtime_enable(domain->dev);

if (domain->bits.map)
--
2.30.0
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