linux-kernel - [PATCH 2/2] clk: ti: get register address from device tree

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Message-Id: <20210402192054.7934-3-dariobin@libero.it>
Date:   Fri,  2 Apr 2021 21:20:54 +0200
From:   Dario Binacchi <dariobin@...ero.it>
To:     linux-kernel@...r.kernel.org
Cc:     Dario Binacchi <dariobin@...ero.it>, Bin Meng <bmeng.cn@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Tero Kristo <kristo@...nel.org>, linux-clk@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [PATCH 2/2] clk: ti: get register address from device tree

Until now, only the register offset was retrieved from the device tree
to be added, during access, to a common base address for the clocks.
If possible, we try to retrieve the physical address of the register
directly from the device tree.

Signed-off-by: Dario Binacchi <dariobin@...ero.it>

---

 drivers/clk/ti/clk.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index 3da33c786d77..938f5a2cb425 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -265,9 +265,21 @@ int __init ti_clk_retry_init(struct device_node *node, void *user,
 int ti_clk_get_reg_addr(struct device_node *node, int index,
 			struct clk_omap_reg *reg)
 {
+	const __be32 *addrp;
+	u64 size, addr = OF_BAD_ADDR;
+	unsigned int flags;
 	u32 val;
 	int i;
 
+	addrp = of_get_address(node, index, &size, &flags);
+	if (addrp)
+		addr = of_translate_address(node, addrp);
+
+	if (addr != OF_BAD_ADDR) {
+		reg->ptr = ioremap(addr, sizeof(u32));
+		return 0;
+	}
+
 	for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
 		if (clocks_node_ptr[i] == node->parent)
 			break;
@@ -287,7 +299,6 @@ int ti_clk_get_reg_addr(struct device_node *node, int index,
 
 	reg->offset = val;
 	reg->ptr = NULL;
-
 	return 0;
 }
 
-- 
2.17.1