RE: [PATCH 09/10] stmmac: MDC clock dynamically based on the csr clock input

-----Original Message-----
From: netdev-owner@vger.kernel.org 
[mailto:netdev-owner@vger.kernel.org] On Behalf Of Giuseppe CAVALLARO
Sent: 23 March 2012 09:09
To: netdev@vger.kernel.org
Cc: davem@davemloft.net; srinivas.kandagatla@st.com; 
deepak.sikri@st.com; spear-devel@list.st.com; 
shiraz.hashim@st.com; viresh.kumar@st.com; 
bhutchings@solarflare.com; Giuseppe Cavallaro
Subject: [PATCH 09/10] stmmac: MDC clock dynamically based on 
the csr clock input

If a specific clk_csr value is passed from the platform
this means that the CSR Clock Range selection cannot be
changed at run-time and it is fixed (as reported in the driver
documentation). Viceversa the driver will try to set the MDC
clock dynamically according to the actual clock input.

Signed-off-by: Deepak Sikri <redacted>
Reviewed-by: Francesco Virlinzi <redacted>
Signed-off-by: Giuseppe Cavallaro <redacted>
---
 Documentation/networking/stmmac.txt               |    2 +-
 drivers/net/ethernet/stmicro/stmmac/common.h      |   10 +++++
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      |    1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |   40 
+++++++++++++++++++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c |    4 +-
 5 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/stmmac.txt 

b/Documentation/networking/stmmac.txt
index eacb640..ab1e8d7 100644

--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt

@@ -137,7 +137,7 @@ Where:
  o pbl: the Programmable Burst Length is maximum number of beats to
        be transferred in one DMA transaction.
        GMAC also enables the 4xPBL by default.
- o clk_csr: CSR Clock range selection.
+ o clk_csr: fixed CSR Clock range selection.
  o has_gmac: uses the GMAC core.
  o enh_desc: if sets the MAC will use the enhanced 

descriptor structure.
  o tx_coe: core is able to perform the tx csum in HW.

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h 

b/drivers/net/ethernet/stmicro/stmmac/common.h
index f4df1eb..312e3f1 100644

--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h

@@ -97,6 +97,16 @@ struct stmmac_extra_stats {
 	unsigned long normal_irq_n;
 };
 
+/* CSR Frequency Access Defines*/
+#define CSR_F_35M	35000000
+#define CSR_F_60M	60000000
+#define CSR_F_100M	100000000
+#define CSR_F_150M	150000000
+#define CSR_F_250M	50000000
+#define CSR_F_300M	300000000