linux-kernel - [PATCH v3 3/6] bus: ti-sysc: Add support for using ti-sysc for MCAN on dra76x

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Date:   Wed, 6 Jun 2018 11:38:23 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-clk@...r.kernel.org>
CC:     <robh+dt@...nel.org>, <bcousson@...libre.com>, <tony@...mide.com>,
        <paul@...an.com>, <t-kristo@...com>, <faiz_abbas@...com>,
        <mark.rutland@....com>
Subject: [PATCH v3 3/6] bus: ti-sysc: Add support for using ti-sysc for MCAN on dra76x

The dra76x MCAN generic interconnect module has a its own
format for the bits in the control registers.

Therefore add a new module type, new regbits and new capabilities
specific to the MCAN module.

Acked-by: Rob Herring <robh@...nel.org>
CC: Tony Lindgren <tony@...mide.com>
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
---
 .../devicetree/bindings/bus/ti-sysc.txt        |  1 +
 drivers/bus/ti-sysc.c                          | 18 ++++++++++++++++++
 include/dt-bindings/bus/ti-sysc.h              |  2 ++
 include/linux/platform_data/ti-sysc.h          |  1 +
 4 files changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/bus/ti-sysc.txt b/Documentation/devicetree/bindings/bus/ti-sysc.txt
index 2957a9ae291f..ebbb11144b7b 100644
--- a/Documentation/devicetree/bindings/bus/ti-sysc.txt
+++ b/Documentation/devicetree/bindings/bus/ti-sysc.txt
@@ -36,6 +36,7 @@ Required standard properties:
 		"ti,sysc-omap-aes"
 		"ti,sysc-mcasp"
 		"ti,sysc-usb-host-fs"
+		"ti,sysc-dra7-mcan"
 
 - reg		shall have register areas implemented for the interconnect
 		target module in question such as revision, sysc and syss
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 7cd2fd04b212..4a2244419b9b 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1262,6 +1262,23 @@ static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
 	.regbits = &sysc_regbits_omap4_usb_host_fs,
 };
 
+static const struct sysc_regbits sysc_regbits_dra7_mcan = {
+	.dmadisable_shift = -ENODEV,
+	.midle_shift = -ENODEV,
+	.sidle_shift = -ENODEV,
+	.clkact_shift = -ENODEV,
+	.enwkup_shift = 4,
+	.srst_shift = 0,
+	.emufree_shift = -ENODEV,
+	.autoidle_shift = -ENODEV,
+};
+
+static const struct sysc_capabilities sysc_dra7_mcan = {
+	.type = TI_SYSC_DRA7_MCAN,
+	.sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
+	.regbits = &sysc_regbits_dra7_mcan,
+};
+
 static int sysc_init_pdata(struct sysc *ddata)
 {
 	struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
@@ -1441,6 +1458,7 @@ static const struct of_device_id sysc_match[] = {
 	{ .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
 	{ .compatible = "ti,sysc-usb-host-fs",
 	  .data = &sysc_omap4_usb_host_fs, },
+	{ .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
 	{  },
 };
 MODULE_DEVICE_TABLE(of, sysc_match);
diff --git a/include/dt-bindings/bus/ti-sysc.h b/include/dt-bindings/bus/ti-sysc.h
index 2c005376ac0e..7138384e2ef9 100644
--- a/include/dt-bindings/bus/ti-sysc.h
+++ b/include/dt-bindings/bus/ti-sysc.h
@@ -15,6 +15,8 @@
 /* SmartReflex sysc found on 36xx and later */
 #define SYSC_OMAP3_SR_ENAWAKEUP		(1 << 26)
 
+#define SYSC_DRA7_MCAN_ENAWAKEUP	(1 << 4)
+
 /* SYSCONFIG STANDBYMODE/MIDLEMODE/SIDLEMODE supported by hardware */
 #define SYSC_IDLE_FORCE			0
 #define SYSC_IDLE_NO			1
diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
index 80ce28d40832..1ea3aab972b4 100644
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -14,6 +14,7 @@ enum ti_sysc_module_type {
 	TI_SYSC_OMAP4_SR,
 	TI_SYSC_OMAP4_MCASP,
 	TI_SYSC_OMAP4_USB_HOST_FS,
+	TI_SYSC_DRA7_MCAN,
 };
 
 struct ti_sysc_cookie {
-- 
2.17.0