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From:   Conor Dooley <mail@conchuod.ie>
To:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
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Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Conor Dooley <conor.dooley@microchip.com>,
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        linux-riscv@lists.infradead.org
Subject: [PATCH v2 08/16] riscv: dts: canaan: fix the k210's memory node.
Date:   Mon, 27 Jun 2022 20:39:56 +0100
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From: Conor Dooley <conor.dooley@microchip.com>

The k210 U-Boot port has been using the clocks defined in the
devicetree to bring up the board's SRAM, but this violates the
dt-schema. As such, move the clocks to a dedicated node with
the same compatible string. The regs property does not fit in
either node, so is replaced by comments.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
The corresponding U-Boot code seems to be:
static int sram_init(void)
{
        int ret, i;
        const char * const banks[] = { "sram0", "sram1", "aisram" };
        ofnode memory;
        struct clk clk;

        /* Enable RAM clocks */
        memory = ofnode_by_compatible(ofnode_null(), "canaan,k210-sram");
        if (ofnode_equal(memory, ofnode_null()))
                return -ENOENT;

        for (i = 0; i < ARRAY_SIZE(banks); i++) {
                ret = clk_get_by_name_nodev(memory, banks[i], &clk);
                if (ret)
                        continue;

                ret = clk_enable(&clk);
                clk_free(&clk);
                if (ret)
                        return ret;
        }

        return 0;
}

Which, without having the hardware etc, I suspect is likely to keep
working after the move.
---
 arch/riscv/boot/dts/canaan/k210.dtsi | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/boot/dts/canaan/k210.dtsi b/arch/riscv/boot/dts/canaan/k210.dtsi
index 44d338514761..cd4eae82d8b2 100644
--- a/arch/riscv/boot/dts/canaan/k210.dtsi
+++ b/arch/riscv/boot/dts/canaan/k210.dtsi
@@ -69,11 +69,13 @@ cpu1_intc: interrupt-controller {
 
 	sram: memory@80000000 {
 		device_type = "memory";
+		reg = <0x80000000 0x400000>, /* sram0 4 MiB */
+		      <0x80400000 0x200000>, /* sram1 2 MiB */
+		      <0x80600000 0x200000>; /* aisram 2 MiB */
+	};
+
+	sram_controller: memory-controller {
 		compatible = "canaan,k210-sram";
-		reg = <0x80000000 0x400000>,
-		      <0x80400000 0x200000>,
-		      <0x80600000 0x200000>;
-		reg-names = "sram0", "sram1", "aisram";
 		clocks = <&sysclk K210_CLK_SRAM0>,
 			 <&sysclk K210_CLK_SRAM1>,
 			 <&sysclk K210_CLK_AI>;
-- 
2.36.1