[PATCH] arm64: zynqmp: Add 'silabs, skip-recall' to all si570 clk nodes
Michal Simek
michal.simek at amd.com
Tue Feb 6 12:32:02 CET 2024
On 1/25/24 09:07, Michal Simek wrote:
> From: Saeed Nowshadi <saeed.nowshadi at amd.com>
>
> Without 'silabs,skip-recall' property, the driver on System Controller
> re-calibrates the output clock frequency at probe() time based on the NVRAM
> setting. This re-calibration causes a glitch on the output clock. At
> power-on, Versal is also booting and expecting a glitch-free clock for
> its correct operation. System Controller should skip the re-calibration
> step to prevent any clock instability for Versal.
>
> Signed-off-by: Saeed Nowshadi <saeed.nowshadi at amd.com>
> Signed-off-by: Michal Simek <michal.simek at amd.com>
> ---
>
> arch/arm/dts/zynqmp-e-a2197-00-revA.dts | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/dts/zynqmp-e-a2197-00-revA.dts b/arch/arm/dts/zynqmp-e-a2197-00-revA.dts
> index f1b0a4aa65dd..0b97fa3f28ac 100644
> --- a/arch/arm/dts/zynqmp-e-a2197-00-revA.dts
> +++ b/arch/arm/dts/zynqmp-e-a2197-00-revA.dts
> @@ -449,6 +449,7 @@
> factory-fout = <156250000>;
> clock-frequency = <156250000>;
> clock-output-names = "si570_zsfp_clk";
> + silabs,skip-recall;
> };
> };
> i2c at 6 { /* USER_SI570_1 */
> @@ -463,6 +464,7 @@
> factory-fout = <100000000>;
> clock-frequency = <100000000>;
> clock-output-names = "si570_user1";
> + silabs,skip-recall;
> };
>
> };
> @@ -560,6 +562,7 @@
> factory-fout = <200000000>;
> clock-frequency = <200000000>;
> clock-output-names = "si570_lpddr4_clk2";
> + silabs,skip-recall;
> };
> };
> i2c at 5 { /* LPDDR4_SI570_CLK1 */
> @@ -574,6 +577,7 @@
> factory-fout = <200000000>;
> clock-frequency = <200000000>;
> clock-output-names = "si570_lpddr4_clk1";
> + silabs,skip-recall;
> };
> };
> i2c at 6 { /* HSDP_SI570 */
> @@ -588,6 +592,7 @@
> factory-fout = <156250000>;
> clock-frequency = <156250000>;
> clock-output-names = "si570_hsdp_clk";
> + silabs,skip-recall;
> };
> };
> i2c at 7 { /* 8A34001 - U219B and J310 connector */
Applied.
M
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