linux-kernel - [PATCH RFC 2/3] dt-bindings: mmc: brcm,sdhci-brcmstb: Add sdio sharing support

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Message-Id: <20250206220940.10553-3-kamal.dasu@broadcom.com>
Date: Thu,  6 Feb 2025 17:09:39 -0500
From: Kamal Dasu <kamal.dasu@...adcom.com>
To: ulf.hansson@...aro.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	adrian.hunter@...el.com,
	linux-mmc@...r.kernel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	wsa+renesas@...g-engineering.com
Cc: f.fainelli@...il.com,
	bcm-kernel-feedback-list@...adcom.com,
	Kamal Dasu <kdasu@...adcom.com>
Subject: [PATCH RFC 2/3] dt-bindings: mmc: brcm,sdhci-brcmstb: Add sdio sharing support

From: Kamal Dasu <kdasu@...adcom.com>

Introduce emmc flash sharing support using hardware semaphore
and SDIO share register to synchronize between TZOS and linux.

Signed-off-by: Kamal Dasu <kdasu@...adcom.com>
---
 .../bindings/mmc/brcm,sdhci-brcmstb.yaml         | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
index eee6be7a7867..b0ee39aeccb1 100644
--- a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
+++ b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
@@ -27,15 +27,23 @@ properties:
           - const: brcm,sdhci-brcmstb
 
   reg:
-    maxItems: 2
+    minItems: 2
 
   reg-names:
     items:
       - const: host
       - const: cfg
+      - const: share        # Optional reg 
+      - const: mmc_sem      # Optional reg
+      - const: flshr_ipis0  # Optional reg
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+
+  interrupt-names:
+    items:
+      - const: SDIO1_0
+      - const: recv_ipi0   # Optional interrupt
 
   clocks:
     minItems: 1
@@ -76,6 +84,7 @@ required:
   - compatible
   - reg
   - interrupts
+  - interrupt-names
   - clocks
   - clock-names
 
@@ -111,7 +120,8 @@ examples:
       supports-cqe;
       non-removable;
       bus-width = <0x8>;
-      interrupts = <0x0 0x27 0x4>;
+      interrupts-extended = <0x1 0x0 0x1f 0x4 0x18 0x11>;
+      interrupt-names = "SDIO1_0", "recv_ipi0";
       clocks = <&scmi_clk 245>;
       clock-names = "sw_sdio";
     };
-- 
2.17.1