2020-07-27 11:07:49

by Christian Eggers

Subject: [PATCH] Support for RNGB on i.MX6 ULL

This small series adds support for the Random Number Generator on
the i.MX6 ULL SoC.

2020-07-27 11:07:55

by Christian Eggers

Subject: [PATCH 1/3] ARM: dts: imx6ull: Add rngb node

The RNGB block on 6ull has no major differences, but it has no
switchable clock.

Signed-off-by: Christian Eggers <[email protected]>
---
arch/arm/boot/dts/imx6ull.dtsi | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/imx6ull.dtsi b/arch/arm/boot/dts/imx6ull.dtsi
index fcde7f77ae42..3d021b304a83 100644
--- a/arch/arm/boot/dts/imx6ull.dtsi
+++ b/arch/arm/boot/dts/imx6ull.dtsi
@@ -68,6 +68,12 @@ dcp: crypto@2280000 {
clock-names = "dcp";
};

+ rngb: rng@2284000 {
+ compatible = "fsl,imx6ull-dcp", "fsl,imx25-rngb";
+ reg = <0x02284000 0x4000>;
+ interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
+ };
+
iomuxc_snvs: iomuxc-snvs@2290000 {
compatible = "fsl,imx6ull-iomuxc-snvs";
reg = <0x02290000 0x4000>;
--
Christian Eggers
Embedded software developer

Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler

2020-07-27 11:08:04

by Christian Eggers

Subject: [PATCH 2/3] hwrng: imx-rngc - make clock optional

On i.MX6 ULL the RNGB has no switchable clock.

Signed-off-by: Christian Eggers <[email protected]>
---
drivers/char/hw_random/imx-rngc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index 9c47e431ce90..f9c5ddd0276b 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -245,7 +245,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
if (IS_ERR(rngc->base))
return PTR_ERR(rngc->base);

- rngc->clk = devm_clk_get(&pdev->dev, NULL);
+ rngc->clk = devm_clk_get_optional(&pdev->dev, NULL);
if (IS_ERR(rngc->clk)) {
dev_err(&pdev->dev, "Can not get rng_clk\n");
return PTR_ERR(rngc->clk);
--
Christian Eggers
Embedded software developer

Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler

2020-07-27 11:08:06

by Christian Eggers

Subject: [PATCH 3/3] hwrng: imx-rngc - setup default RNG quality

When hw_random device's quality is non-zero, it will automatically fill
the kernel's entropy pool at boot. For this purpose, one conservative
quality value is being picked up as the default value.

Signed-off-by: Christian Eggers <[email protected]>
---
drivers/char/hw_random/imx-rngc.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index f9c5ddd0276b..a62ff78bd7ea 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -285,6 +285,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
rngc->rng.init = imx_rngc_init;
rngc->rng.read = imx_rngc_read;
rngc->rng.cleanup = imx_rngc_cleanup;
+ rngc->rng.quality = 900;

rngc->dev = &pdev->dev;
platform_set_drvdata(pdev, rngc);
--
Christian Eggers
Embedded software developer

Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler